Huawei H12-831_V1.0 Questions and Answers

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H12-831_V1.0 HCIP-Datacom-Advanced Routing & Switching Technology questions and answers are available, which are valid in the preparation. There are 60 questions in real Huawei H12-831_V1.0 exam, and you have 90 minutes to finish all the questions. The required passing score of Huawei H12-831_V1.0 exam is 600. The available languages are English and Japanese. The exam format is Single-answer Qusetion, Multiple-answer Question, True or false, Short Response Item, Drag and Drop Item. Free Huawei H12-831_V1.0 questions and answers are available below.

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1. In the IS-IS network shown in the figure, R1 introduces the default route through the "default-route-advertise always level-1" command. Which of the following descriptions are correct? (Multiple choice)

There is a default route in R3's routing table

There is a default route in R2's routing table

There is no default route in R1's routing table

Although R1 is configured with the "default-route-advertise always level-1" command, it cannot import the default route

2. In the IS-IS network shown in the figure, R1 introduces the default route through the "default-route-advertise always level-1" command. Which of the following descriptions is wrong?

Ping any non-existent IP address on R1, such as 10.0.4.4. The data packet will not be sent from R1.

10.0.1.1 can ping 10.0.3.3

10.0.1.1 can ping 10.0.2.2

10.0.2.2 can ping 10.0.3.3

3. In the OSPF network shown in the figure, the area numbers are marked in the figure, where area 1 is the Stub area, area 2 is the Totally Stub area, and area 3 is the NSSA area. By default, which of the following routers does not have a default route in its routing table?

4. In the OSPF network shown in the figure, the link cost value has been marked in the figure. R1 enables OSPF IP FRR. The main path for R1 to reach 10.0.3.3/32 is R1-R2-R3, and the backup path is R1-R4-R2-R3.

True

False

5. In the OSPF network shown in the figure, the cost value of the link is marked in the figure. R1 has enabled OSPP IP FR and configured the "maximum load-balancing 8" command in the OSPF process. Which of the following is the cost value of reaching 10.0.35.0/24 in R1's routing table?

6. The OSPF protocol requires routers in the same area to save the same link state database LSDB. As the number of routes on the network continues to increase, some routers cannot carry so much routing information due to limited system resources. This state is called database overload.

If all routers in an OSPE network are configured with "Isdb-overf1low-limit number 7", which of the following scenarios may cause the router to enter the Overflow state? (Multiple choice)

The number of Type 5 LSAs exceeds 7

The number of Type 3 LSAs exceeds 7

The number of Type 4 LSAs exceeds 7

The number of Type 7 LSAs exceeds 7

7. In order to protect the BGP protocol from attacks, Keychain authentication can be used between BGP neighbors to reduce the possibility of attacks. The keychain has a set of passwords that can be automatically switched according to the configuration, which is suitable for networks with high security requirements.

True

False

8. In the network shown in the figure, adjacent routers use directly connected interfaces to establish EBGP neighbor relationships. The Router ID of each device is 10.0.XX, and the AS number is 6500x, where X is the router number. R1 and R4 both have static routes to 192.168.1.0/24, which are introduced into BGP through import. R1 adds the Community attribute value (1:1) when sending routes to its neighbors, and all routers in the network are enabled to transmit community attributes.

R2 and R3 are configured with routing policies that reject routes with a community attribute value of 1:1. Which of the following is the path for traffic from R3 to 192.168.1.0/24?

R3-R2-R4

R3-R2-R1

R3 has no route to 192.168.1.0/24

R3-R5-R1

9. In the network shown in the figure, adjacent routers use directly connected interfaces to establish EBGP neighbor relationships. The AS number is 6500X, where X is the router number. R1 and R4 both have static routes to 192.168.1.0/24, which are introduced into BGP through import. The maximum number of equal-cost routes configured for EBGP load sharing on R3 is 8.

By default, the number of equal-cost routes from R3 to 192.168.1.0/24 is which of the following?

10. Use "display ospfv3 peer verbose" to view OSPFv3 neighbor information. In the output information, you can see the peer's Router ID, the global unicast address of the peer's interface, the neighbor's status, and other content.

True

False

Page 2 of 12

11. In the OSPFv3 network shown in the figure, the interconnected ports of R1, R2, and R3 have OSPFv3 enabled, and the Router ID of each device is 10.0.XX, where X is the device number. Check the detailed information of a certain LSA on R3. From the output information, it can be inferred that the LSA is generated by R2, and it describes the IPv6 prefix address associated with the Network-LSA.

True

False

12. In the OSPFv3 network shown in the figure, the IPv6 address of R3 Loopback0 interface is 2000::3/128, and OSPFv3 is enabled.

Which of the following descriptions are correct? (Multiple choice)

R2 will definitely generate a Link-LSA

R1 will definitely generate a Network-LSA

R3 will definitely generate an Intra-Area-Prefix-LSA

The Link-LSA generated by R2 will not appear in R1's LSDB

13. The LSP information generated by a certain IS-IS router is shown in the figure. From the LSP information, it can be inferred that the router is not the DIS of this link.

True

False

14. In the OSPFv3 network shown in the figure, area 1 is an NSSA area. R1 imports the external route 2000::1/128 into OSPFv3.

What types of LSAs are in area 0 by default? (Multiple choice)

Link-LSA

Inter-Area-Router-LSA

Inter-Area-Prefix-LSA

Intra-Area Prefix-LSA

15. In the OSPFv3 network shown in the figure, area 1 is a stub area, area 2 is a common area, and area 3 is an NSSA area. The IPv6 address of the R6Loopback0 interface is 2000::6/128. The Router ID of each device is 10.0.XX, where X is the device number.

Which of the following descriptions is wrong?

The R4 LSDB contains the Inter-Area-Prefix-LSA describing 2000::6/128 generated by R2.

The Inter-Area-Prefix-LSA describing 2000::6/128 generated by R2 exists in R1's LSD

The R6 LSDB contains the Inter-Area-Prefix-LSA describing 2000::6/128 generated by R3.

The R5 LSDB contains the Inter-Area-Prefix-LSA describing 2000::6/128 generated by R1.

16. When creating an IPv6 static route, for a point-to-point interface, the outbound interface must be specified. For a broadcast type interface, the next hop must be specified.

True

False

17. In the OSPFv3 network shown in the figure, the interconnected ports of R1, R2, and R3 have OSPFv3 enabled, and the Router ID of each device is 10.0.XX, where x is the device number. Check the detailed information of a certain LSA on R3, and you can infer from the output information that R1 and R2 are DRs in the network.

True

False

18. The Link-LSA generated by an OSPFv3 router is shown in the figure. Which of the following is the number of global unicast addresses configured on the interface?

19. To support the processing and calculation of IPv6 routes, IS-IS adds a new MLPID in TLV No. 129.

MLPID is an 8-bit field that identifies a network layer protocol message. Which of the following is the MLPID value for IPv6?

204

142

232

236

20. In the OSPFv3 network shown in the figure, area 1 is the Totally Stub area, area 2 is the normal area, and area 3 is the Totally NSSA area. The IPv6 address of the R6 Lopback0 interface is 2000::6/128. The Router ID of each device is 10.0.XX, where X is the device number.

When all links are normal, which of the following descriptions are correct by default? (Multiple choice)

The path for R4 to send a data packet to 2000::6 may be R4-R1-R3-R6

The path that R4 sends the data packet to reach 2000::6 may be R4-R2-R6

The path for R4 to send a data packet to 2000::6 may be R4-R1-R5-R3-R6

The path for R4 to send a data packet to 2000::6 may be R4-R1-R2-R6

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21. The Router ID of R4 is 10.0.4.4. In the LSDB of R4, the LSA shown in the figure is seen. The network engineer makes the following inferences based on the LSA. Which one is wrong?

This LSA is generated by R4

R4 has two OSPFv3 neighbors

R4 is the DR on both links

R4 does not support importing external routes into OSPFv3

22. There are many types of MAC address entries on the switch. Which of the following types are manually configured by the user and cannot be aged? (Multiple choice)

Blackhole MAC address table

MUX MAC address table

Dynamic MAC address table

Static MAC address table

23. As shown in the figure, the network administrator deploys the DHCP Snooping function on the switch to defend against attacks by DHCP Server impersonators. Which of the following interfaces should be set as a DHCP trusted interface?

GE0/0/2

GE0/0/3

GE0/0/1

GE0/0/4

24. The network administrator has deployed the DHCP snooping function on the access switch. Which of the following solutions can be used to reduce the impact of attackers maliciously applying for IP addresses and causing DHCP Server denial of service? (Multiple choice)

Enable the device to generate static MAC entries for interfaces based on the DHCP Snooping binding table.

Configure DHCP Snooping to check the CHADDR field in the DHCP Request message

Set the interface on the switch that is connected to the legitimate DHCP server as a trusted interface

Limit the number of MAC addresses learned by the switch interface through DHCP Snooping

25. When the switch is configured with port isolation function, by default, different hosts belonging to the same VLAN cannot communicate at layer 1 and layer 3.

True

False

26. On the same switch interface, the administrator can only configure traffic suppression for one of the following: broadcast, unknown multicast, unknown unicast, known multicast, and known unicast packets.

True

False

27. As shown in the figure, VLAN aggregation is deployed in a switching network, where Sub-VLAN 10 and Sub-VLAN 20 are added to Super-VLAN 100. If PC1 and PC2, PC1 and PC3 are to be able to communicate with each other, which of the following descriptions about the L3 Switch interface type and the VLAN that should be allowed is correct?

GE0/0/1 and GE0/0/2 are both access ports, and the PVID is set to VLAN10.

GE0/0/1 is a Trunk port, allowing VLAN 10 and VLAN 20 to pass; GE0/0/2 is an Access port, and the PVID is set to VLAN 10

GE0/0/1 is an access port, and its PVID is set to VLAN 10; GE0/0/2 is a trunk port, and VLAN 10 is allowed.

Both GE0/0/1 and GE0/0/2 are Trunk ports, and only VLAN 10 is allowed to pass.

28. The MPLS label is a 20-bit local identifier. When the administrator configures a static LSP, the incoming label and outgoing label can be manually specified. The value range is 0~1048575.

True

False

29. The exchange of Hello messages between two LSRs (Label switching Routers) triggers the establishment of an LDP session. The Hello message carries the transport address. The device with the smaller transport address will act as the active party and initiate the establishment of a TCP connection.

True

False

30. MPLS determines the upstream and downstream relationship based on the data forwarding direction. The MPLS label message is sent from the upstream LSR and received and processed by the downstream LSR. Similarly, the release of MPLS labels is also distributed one by one from upstream to downstream.

True

False

Page 4 of 12

31. MPLS needs to assign labels to messages in advance and establish an LSP before it can forward messages. LSP is divided into static LSP and dynamic LSP. Which of the following protocols can be used to establish a dynamic LSP? (Multiple choice)

IS-IS

RSVP-TE

PIM-SM

LDP

32. As shown in the figure, an enterprise hopes to achieve secure mutual visits between the headquarters and branches, as well as business isolation between the R&D area and the non-R&D area without changing the network deployment.

To meet this requirement, the administrator deploys BGP/MPLS IP VPN in the network. Which of the following descriptions of this scenario are correct? (Multiple choice)

To achieve mutual access between the headquarters and the branch R&D area, you can set the ERI and IRT of VPN1 and VEN2 to 100:100.

Since the address space of the R&D area and the non-R&D area overlap, it is impossible to isolate the business of the two areas.

To isolate the R&D area and non-R&D area of the headquarters, you can set the RT value of VPN1 to 100:100 and the RT value of VPN3 to 200:200.

To achieve mutual access between the headquarters and the branch R&D area, the RD values of VPN1 and VFN2 need to be set to the same value.

33. In a BGP/IPLS IP VPN network, the output information of a PE device VPN1 is shown in the figure. When the VPIv4 route corresponding to VPN1 is advertised to the remote PE, which VPNs of the remote PE will receive the route? (Multiple choice)

ip vpn-instance VPN1

ipv4-family

route-distinguisher 100:1

vpn-target 100:1 200:1 300:1 export-extcommunity

VPN1: Import RT=100:1

VPN4: Import RT=500:1

VPN2: Import RT=200:1, 400:1

VPN3: Import RT=100:1, 300:1

34. In a certain MPLS network, the LSP information of R1 and R3 is shown in the figure. At this time, the administrator enters the command ping -a 1.1.1.1 3.3.3.3 on R1. Which of the following descriptions of this scenario is correct?

The Echo Request message received by R2 carries label 1025, while the Echo Reply message received by R2 does not carry a label.

The Echo Request message received by R2 carries label 1025, and the Echo Reply message received by R2 carries label 1024

The Echo Request message received by R2 does not carry a label, and the Echo Reply message received by R2 does not carry a label either.

The Echo Request message received by R2 does not carry a label, and the Echo Reply message received by R2 carries label 1024

35. In a BGP/MPLS IP VPN network, VPNv4 routing transfers carry Export RT values. Which of the following path attributes does MP-BGP use to carry Export RT?

Extended Community

AS Path

Local Preference

MP_REACH_NLRI

36. As shown in the figure, RIR4 is one of the four routers in AS 123. They all run OSPE and realize the routing interconnection within the AS. Among them, the two network segments 10.1.1.0/24 and 10.4.4.0/24 are not published to OSPF. Now, R1 and R4 have established an IBGP peer relationship based on the Loopback0 interface, and published the network segments 10.1.1.0/24 and 10.4.4.0/24 to BGP respectively.

Which of the following methods can enable PC1 and PC2 to communicate with each other? (Multiple choice)

Deploy policy routing on R1 and specify R2 as the next hop for traffic from PC1 to PC2.

Run BGP on R2 and R3 and establish IBGP full interconnection in AS123

On R1 and R4, import routes 10.1.1.0/24 and 10.4.4.0/24 into OSPF respectively.

Activate MPLS and LDP on R1~R4 and establish LSPs for routes 1.1.1.1/32 and 4.4.4.4/32.

37. In the Hub&Spoke network shown in the figure, Hub-PE can allow local AS number duplication through manual configuration to achieve correct routing transmission.

True

False

38. The equipment operating environment refers to the external environment such as the equipment room, power supply, and heat dissipation where the equipment operates. This is the basic condition for the equipment to operate. For the maintenance of the equipment operating environment, the staff can only complete it by visiting the site in person.

True

False

39. Network maintenance can be divided into two categories: daily maintenance and troubleshooting. If the maintenance personnel have a high level of technical skills, they can maintain the network based on experience without following operating specifications.

True

False

40. A network device has established an OSPF neighbor relationship. The configuration of its GE0/0/0 interface is shown in the figure. Which of the following commands executed on this interface will not affect the OSPF neighbor status of this interface? (Multiple choice)

undo ospf dr-priority

undo description

undo ospf Cost

undo ip address 10.0.12.2 24

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41. A network engineer accidentally deleted the IP address of an interface through the command line. If he wants to view the deleted IP address, which of the following information should he query?

Debug information

Log information

Trap information

SNMP agent information

42. Which of the following operations does a network engineer not need to perform when processing a single-hop BFD session Dom?

Repeat the display bfd statistics session all command to view the statistics of the BFD session sent and received packets.

If a static route is bound to a BFD session, run the display ip routing-tab1e command to check whether the static route exists in the routing table.

Run the display current-configuration configuration bfd command to check whether the local discriminator and remote discriminator at both ends of the BFD session match.

Ping the link between the BFD sessions to check whether forwarding is normal.

43. A network engineer captured a multicast data frame whose destination MAC address is 01-00-5e-00-01-01. Based on this analysis, which of the following cannot be the destination IPv4 address?

224.0.0.1

224.0.1.1

225.0.1.1

239.128.1.1

44. When the device logs in to other devices as an SSH client and fails to log in using public key authentication, which of the following are possible reasons? (Multiple choice)

The user public key stored on the server is wrong

The client does not enable the first authentication function

Missing local key pair

The server private key saved on the client is wrong

45. The detection mechanism of BFD is that two systems establish a BFD session and periodically send BFD control messages along the path between them. If one party does not receive the BFD control message within a specified time, it is considered that a fault has occurred on the path.

Which of the following reasons will not cause the BFD session to go Down?

The remote identifier and local identifier of the BFD session do not match

The message with UDP port number 4784 is rejected

The session-name of the BFD session is inconsistent

The outbound interface bound to the single-hop BFD session is physically faulty.

46. In the network shown in the figure, R1 and R2 are configured with single-hop BFD detection. The network engineer found that the BFD session was Down, so he queried the configuration related to R1 and R2 BD. The configuration information has been marked in the figure. According to the configuration information, the reason for the BFD session Down is that the time parameters configured on R1 and R2 do not match.

True

False

47. If a network engineer forgets the console port password when troubleshooting, Huawei Net Engine AR series routers support configuration in the Boot ROM to skip the console port password startup.

True

False

48. The networks of large and medium-sized enterprises can be divided into access layer, aggregation layer and core layer. Network engineers need to formulate cutover plans for any operations performed at any layer that affect the existing network services.

True

False

49. A network engineer wants to clear the serial port login password. Which of the following should he enter?

50. When executing a cutover project, network engineers can perform remote operations at the customer's network maintenance center and guide on-site construction personnel to complete hardware-related operations, such as powering on equipment and connecting equipment.

True

False

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51. The network logic architecture of a cutover project is shown in the figure. The purpose of the cutover is to expand a network device R4 between R2 and R3. The router IDs of R1, R2, and R3 are 10.0.1.1, 10.0.2.2, and 10.0.3.3 respectively. The OSPF protocol runs between network devices.

After the physical network is connected, when performing the cutover operation, the network engineer first mistakenly imports the backup configuration of R3 into R4. Based on this scenario, which of the following descriptions are correct? (Multiple choice)

In R3's LSDB, you can see the LSA generated by R4.

In R1's LSDB, you can see the LSA generated by R3

In R2's LSDB, you can see the LSA generated by R4

In R2's LSDB, you can see the LSA generated by R3

52. In the OSPF network shown in the figure, R1 and R2 achieve intercommunication through Loopback0 interface through OSPF.

At the same time, R1 and R2 have enabled the MPLS LDP function, and the LDP transmission address is the IP address of the Loopback0 interface. The network engineer found that R1 and R2 could not establish an LDP session, so he first executed the command shown in the figure on R2. Based on this, which of the following reasons may cause the failure of establishing an LDP session between R1 and R2? (Multiple choice)

R2 GE0/0/1 interface refuses to receive packets with a destination IP address of 224.0.0.2

R1 GE0/0/1 interface refuses to receive packets with a destination IP address of 224.0.0.5

R2 GE0/0/1 interface refuses to receive packets with source IP address 10.0.12.1

R1 GE0/0/1 interface refuses to receive packets with TCP destination port 646

53. In the networking shown in the figure, R1 and R2 cannot establish an EBGP neighbor relationship through the directly connected interface. The network engineer first checked the BGP-related configurations of R1 and R2, and determined that the reason why R1 and R2 cannot establish an EBGP neighbor relationship is that the Router ID and the interface IP address are inconsistent.

True

False

54. A network engineer discovered that a link failure alarm frequently appeared on the interface of a certain device. The interface is an Ethernet optical port. Which of the following commands can the network engineer use to check the transmit and receive optical power of the interface?

display alarm all

display pon-transceiver

display transceiver

display temperature

55. A network engineer uses the capture-packet tool to capture the message received by the interface. The figure shows some output information. What protocol does this message belong to?

LACP

LLDP

OSPF

BGP

56. In the enterprise network shown in the figure, R3 is connected to the enterprise network management server, and all devices in the network communicate with the network management server through VPN.

During the inspection, it was found that R3 had redundant RT configurations. Which of the following commands can be executed on R3 to delete the redundant RTs without affecting the connectivity of all devices and the network management server? (Multiple choice)

undo vpn-target 1:3 import-extcommunity

undo vpn-target 3:1 import-extcommunity

undo vpn-target 1:3 export-extcommunity

undo vpn-target 2:3 export-extcommunity

57. The concepts of RD and RT are introduced in BGP/MPLS IP VPN network. Which of the following descriptions about RD and RT are correct? (Multiple choice)

The RD value is not used to identify the origin of a route, nor is it used to determine which VPN instance the route should be added to.

A VPNv4 route can only contain one RD value and one RT value

RD is used to resolve IPv4 address conflicts before adding it to the IPv4 address.

VPNv4 address is 96 bits in total, of which the RD value is 64 bits long

58. As shown in the figure, R1, R2, and R3 run WPLS, and the administrator configures a static LSP from the 1.1.1.0/24 network segment to the 3.3.3.0/24 network segment.

Which of the following descriptions of this scene are correct? (Multiple choice)

R3 will perform MPLS forwarding on the traffic sent from PC2 to PC1.

R1 will perform MPLS forwarding on the traffic sent from PC1 to PC2.

PC1 cannot access PC2

PC2 can access PC1

59. MP-BGP adds a new path attribute MP_REACH_NLRI to publish VPNv4 routing information or withdraw unreachable routes in BGP/MPLS IP VPN networks

True

False

60. In the BGP/MPLS IP VPN network shown in the figure, which of the following RT value plans can enable Site 1 and Site 2 to communicate with Site 3? (Multiple choice)

PE1: IRT=100:1; ERT=100:1PE2: IRT=100:1; ERT=100:1PE3: IRT=100:1; ERT=100:1

PE1: IRT=100:1; ERT=100:1PE2: IRT=200:1; ERT=200:1PE3: IRT=100:1, 200:1; ERT=100:1, 200:1

PE1: IRT=100:1; ERT=200:1PE2: IRT=200:1; ERT=100:1PE3: IRT=100:1; ERT=200:1

PE1: IRT=100:1; ERT=200:1PE2: IRT=100:1; ERT=200:1PE3: IRT=200:1; ERT=100:1

Page 7 of 12

61. As shown in the figure, in order to realize the correct transmission of VPN routes in the Hub&Spoke network, the administrator deployed IGP between Hub-PE and Hub-CE, and deployed EBGP between Spoke-PE and Spoke-CE.

True

False

62. In the CE multi-homing scenario, if the PE enables the BGP AS number replacement function, you can also configure the Soo feature to avoid loops, that is, enable this feature through the peer soo command on the EBGP peers between PE and CE.

True

False

63. In the network shown in the figure, the administrator first completes the routing configuration as shown in the options, and then enables MPLS and LDP functions on all devices and interconnected interfaces of R1-R3, so as to realize the traffic from PC1 to PC2 forwarding based on MPLS in the network.

Which of the following routing configuration options can achieve this function?

# R1 Bgp 65000 Router-id 1.1.1.1 Peer 3.3.3.3 as-number 65000 Peer 3.3.3.3 connect-interface LoopBack 0 network 10.1.1.0 24 # R3 Bgp 65000 Router-id 3.3.3.3 Peer 1.1.1.1 as-number 65000 Peer 1.1.1.1 connect-interface LoopBack 0 network 10.3.3.0 24

# R1 ospf 1 Area 0 Network 1.1.1.10.0.0.0 Network 10.1.12.00.0.0.255 bgp 65000 Router-id 1.1.1.1 Peer 3.3.3.3 as-number 65000 Peer 3.3.3.3 connect-interface LoopBack 0 network 10.1.1.0 24 Ip ip-prefix 1 index 10 permit 10.3.3.0 24 route recursive-lookup tunnel ip-prefix 1 # R2 ospf 1 Area 0 Network 2.2.2.20.0.0.0 Network 10.1.12.00.0.0.255 Network 10.1.23.00.0.0.255 # R3 ospf 1 Area 0 Network 3.3.3.30.0.0.0 Network 10.1.23.00.0.0.255bgp 65000 Router-id 3.3.3.3 Peer 1.1.1.1 as-number 65000 Peer 1.1.1.1 connect-interface LoopBack 0 Network 10.3.3.024 Ip ip-prefix 1 index 10 permit 10.1.1.0 24 route recursive-lookup tunnel ip-prefix 1

# R1 ospf 1 Area 0 Network 1.1.1.10.0.0.0 Network 10.1.12.00.0.0.255 Network 10.1.1.00.0.0.255 # ospf 1 Area 0 Network 2.2.2.20.0.0.0 Network 10.1.12.00.0.0.255 Network 10.1.23.00.0.0.255 # R3 ospf 1 Area 0 Network 3.3.3.30.0.0.0 Network 10.1.23.00.0.0.255 Network 10.3.3.00.0.0.255

# R1 ospf 1 Area 0 Network 1.1.1.10.0.0.0 Network 10.1.12.00.0.0.255 # R2 ospf 1 Area 0 Network 2.2.2.20.0.0.0 Network 10.1.12.00.0.0.255 Network 10.1.23.00.0.0.255 # R3 ospf 1 Area 0 Network 3.3.3.30.0.0.0 Network 10.1.23.00.0.0.255

64. In the BGP/MPLS IP VPN network shown in the figure, the administrator uses Hub-spoke networking to implement centralized control of VPN traffic at the Hub site. Which of the following RT value plans for each device is correct?

PE1 VPN1: IRT=100:1; ERT=100:1 PE2 VPN1: IRT=100:1; ERT=100:1 PE3 VPN1: IRT=100:1; ERT=100:1

PE1 VPN1: IRT=100:1; ERT=200:1 PE2 VPN1: IRT=100:1; ERT=200:1 PE3 VPN in: IRT=100:1; VPN_out: ERT=200:1

PE1 VPN1: IRT=100:1; ERT=200:1 PE2 VPN1: IRT=100:1; ERT=200:1 PE3 VPN_in: IRT=200:1; VPN_out: ERT=100:1

PE1 VPN1: IRT=100:1; ERT=200:1 PE2 VPN1: IRT=100:1; ERT=200:1 PE3 VPN1: IRT=200:1; ERT=100:1

65. In the BGP/MPLS IP VPN network, PE and P devices exchange public network labels by running MP-BGP, so that P devices can forward data based on labels.

True

False

66. An enterprise network deploys the MUX VLAN function to control the Layer 2 communication between employees and guests. Which of the following descriptions are correct about the scenario shown in the figure? (Multiple choice)

PC3 and PC4 can communicate at Layer 2

PC1 and PC4 cannot communicate at Layer 2

PC1~PC4 can access the Server

PC1 and PC2 cannot communicate at Layer 2

67. A DHCP Snooping-enabled device will generate a DHCP Snooping binding table based on the DHCP request message information sent by the DHCP client, thereby implementing matching checks on subsequent messages and preventing attacks from illegal users.

True

False

68. When configuring VLAN aggregation, before adding a Sub-VLAN to a Super-VLAN, you must delete the VLANIF interface corresponding to the Sub-VLAN.

True

False

69. As shown in the figure, S73 is the user gateway and DHCP Relay in the network. The administrator plans to deploy the DHCP Snooping function on S73 to prevent DHCP attacks. Which of the following commands does not need to be configured on ST3?

[SW3-GigabitEthernet0/0/1] dhcp snooping enable

[SW3-GigabitEthernet0/0/2] dhcp snooping enable

[SW3] dhcp snooping enable ipv4

[SW3-GigabitEthernet0/0/3] dhcp snooping trusted

70. When the administrator deploys the traffic suppression function on the switch, in the VLAN view of the device, which of the following types of messages can be suppressed based on the bit rate?

Unknown multicast message

Broadcast message

Unknown unicast message

Known unicast message

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71. In order to support multi-topology functions, which of the following TLVs has been newly added by IS-IS?

TLV No. 229

TLV No. 236

TLV No. 129

TLV No. 232

72. The AS-External-LSA generated by a router is shown in the figure. Based on this LSA, which of the following descriptions are correct? (Multiple choice)

The router ID of the router is 10.0.3.3

The cost value of other routers to reach 2000::3 is always 1

This LSA is generated by converting NSSA LSA

The Route Tag value carried by this LSA is 1

73. OSPPv3 is running between R1 and R2, and the IPv6 addresses configured on the interfaces are marked in the figure. The Router ID of R1 is 10.0.1.1, and the Router ID of R2 is 10.0.2.2.

Which of the following is true about the default situation?

The Intra-Area-Prefix-LSA generated by R2 will describe four prefixes

The Intra-Area-Prefix-LSA generated by R1 will describe three prefixes

The Intra-Area-Prefix-LSA generated by R2 will describe three prefixes

The Intra-Area-Prefix-LSA generated by R1 will describe four prefixes

74. In the IS-IS IPV6 network shown in the figure, all routers have multi-topology enabled. Configure "ipv6 default-route-advertise always level-1" in the IS-IS processes of R4 and R5.

By default, which of the following routers have a default route in their routing table? (Multiple choice)

75. The Router-LSA generated by a router is shown in the figure. Based on this LSA, which of the following descriptions are correct? (Multiple choice)

At least one interface of the router belongs to area 0

The router is an ABR

The router is an ASBR

At least one interface of the router belongs to the Stub area

76. In the OSPFv3 network shown in the figure, area 1 is a stub area, area 2 is a common area, and area 3 is an NSSA area. The IPv6 address of the R5 Lopback0 interface is 2000::5/128, which is introduced into OSPFv3 through import. The Router ID of each device is 10.0.XX, where X is the device number.

Which of the following descriptions is correct?

R1 generates an Inter-Area-Router-LSA in area 0

R2 generates an Inter-Area-Router-LSA in area 0

R3 generates an Inter-Area-Router-LSA in Area 3

R3 generates an Inter-Area-Router-LSA in Area 0

77. When creating an IPv6 static route, for a broadcast type interface, you need to specify the next hop, and the next hop address can be a link-local address. When the next hop address is a link-local address, you must specify the outbound interface.

True

False

78. In the network shown in the figure, IS-IS IPv6 runs between R2, R6, and R3, and the IPv6 address of R6 Looback0 interface is 2000::6/128.

Other links all run OSPFv3. Area 1 is a stub area and Area 2 is an NSSA area.

IS-IS routes are imported into OSPFv3 on R2 and R3. Which of the following methods can enable R4 to ping 2000::6? (Multiple choice)

Configure "ipv6 default-route-advertise always level-1" in the IS-IS process of R3.

Configure "attached-bit advertise always" in the IS-IS process of R2.

Configure "ipv6 default-route-advertise always level-1" in the IS-IS process of R2.

Configure "attached-bit advertise always" in the IS-IS process of R3

79. To prevent attackers from forging BGP messages to attack devices, you can protect devices by configuring the GTS function to detect the range of TTL values in the IP message header. If a device is configured with "peer xxxx valid-ttl-hops 100", the valid range of TTL values of the detected messages is [155, 255].

True

False

80. In the network shown in the figure, R1, R2, R4, and R5 run IS-IS in area 49.0001. R3 and R6 run IS-IS in area 49.0002. Configure "import-route isis level-2 into level-1" on R2 and R5. Inside AS65000, R1, R3, R4, and R6 establish IBGP neighbor relationships with R2 and R5, of which R2 and R5 are RRs and R1, R4, R3, and R6 are clients. IBGP neighbor relationships are all established using the Loopback0 interface. The IP address of the Loopback0 interface of each device is 10.0.X.X/32, and the Router ID is 10.0.X.X, where X is the device number. R1 and R4 import the external network 192.168.1.0/24 into BGP, and R3 and R6 import the external network 192.168.2.0/24 into BGP.

Which of the following descriptions are correct by default? (Multiple choice)

There are two equal default routes in R4 routing table.

There are two equal default routes in R1's routing table.

The route entry for 192.168.2.0/24 in R4's routing table has two different outbound interfaces

R1 routing table has a routing entry for 192.168.2.0/24

Page 9 of 12

81. Use the "display version | begin uptime" command on the router, and the first word in the output information is "uptime"

True

False

82. In order to protect the BGP protocol from attacks, MDS authentication can be used between BGP neighbors to reduce the possibility of attacks. The ID5 algorithm is simple to configure. After configuration, a single password is generated, and human intervention is required to change the password.

True

False

83. In the OSPF network shown in the figure, the area numbers are marked in the figure, where area 1 is a common area, area 2 is a stub area, and area 3 is an NSSA area. If R5 introduces an external route 10.0.5.5/32, which of the following routers does not have a route entry for 10.0.5.5/32 in its routing table?

84. In the IS-IS network shown in the figure, the link cost value has been marked in the figure. R1 turns on IS-IS Auto FRR, then the main path for R1 to reach 10.0.3.3/32 is R1-R2-R3, and the backup path is R1-R4-R2-R3.

True

False

85. In a networking environment where the network is relatively stable and has high requirements for routing convergence time, you can specify the OSPF LSA reception time interval to 0 to cancel the LSA reception time interval, so that topology or routing changes can be immediately perceived, thereby accelerating routing convergence.

True

False

86. As shown in the OSPF network, the area numbers are marked in the figure, where area 1 is a common area, area 2 is a Totally NSSA area, and area 3 is an NSSA area. R5 introduces the external route 10.0.5.5/32 into OSPF.

Which of the following routers have a route entry for 10.0.5.5/32 in their routing tables? (Multiple choice)

87. As shown in the OSPF network, the area number has been marked in the figure, where Area 1, Area 2, and Area 3 are all common areas. The IP address of the R5 Loopback0 interface is 10.0.5.5/32, and the interface enables OSPF through the network method.

On the GE0/0/1 interface of R5 and the GE0/0/2 interface of R1, "ospf filter-Isa-out all" is configured. Which of the following routers' routing tables do not contain a route entry for 10.0.5.5/32? (Multiple choice)

88. In the OSPP network shown in the figure, area 1 is a Totally NSSA area, area 2 is a common area, and R4 imports the external route 10.0.4.4/32. The Router ID of each device is 10.0.XX, where X is the device number.

in the OSPF processes of R1 and R3. Which of the following descriptions is correct?

There is no Type 7 LSA in area 2

There is no Type 7 LSA in area 1

There is no Type 4 LSA in area 0

There is no Type 5 LSA in area 0

89. By default, the time interval for sending OSPF Hello messages on P2P and Broadcast type interfaces is 10 seconds, and the neighbor expiration time is 40 seconds.

True

False

90. In the OSPF network shown in the figure, Area 1 and Area 2 are both common areas, and R4 introduces the external route 10.0.4.4/32.

The "asbr-summary 10.0.4.0 255.255.255.0" command is configured in the OSPF processes of R1 and R3. Which of the following routers have a route entry for 10.0.4.4/32 in their routing tables? (Multiple choice)

Page 10 of 12

91. In the IS-IS network shown in the figure, R1 introduces the default route through the "default-route-advertise always level-1" command, and R2 introduces the default route through the "default-route-advertise always level-2" command. Which of the following routers have default routes in their routing tables?

92. In the OSPF network shown in the figure, R1 and R2 are connected by four links. OSPF is enabled on the Loopback0 interface of R2. The "maximum load-balancing 3" command is configured in the OSPF process of R1. Which of the following is the outbound interface from R1 to the Loopback0 interface of R2?

GE0/0/2.20

GE0/0/1

GE0/0/0

GE0/0/2.10

93. OSPF neighbors periodically send Hello messages to establish and maintain adjacency, and the interval of the Hello timer must be consistent, otherwise the adjacency cannot be established. In order to accelerate OSPF convergence, network engineers can set the interval of the Hello message to 1ms.

True

False

94. When there are multiple redundant links in the IS-IS network, multiple equal-cost routes may appear. For a certain route among the equal-cost routes, the network administrator can adjust its priority through the "nexthop xxxx weight value" command. The smaller the value, the higher the priority.

True

False

95. Type 7 LSA is a new LSA type added to support NSSA areas, used to describe the external routing information introduced. It is generated by the Autonomous Region Border Router (ASBR) in the NSSA area, and its diffusion range is similar to that of Type 5 LSA. In addition to the common area and Stub area, Type 7 LSA will be diffused to all NSSA areas in the OSPF network.

True

False

96. In the IS-IS network shown in the figure, R1 introduces the default route through the "default-route-advertise always level-1" command. Which of the following descriptions are correct? (Multiple choice)

10.0.1.1 can ping 10.0.2.2

10.0.1.1 can ping 10.0.3.3

10.0.2.2 can ping 10.0.3.3

10.0.12.2 can ping 10.0.3.3

97. In the IS-IS network shown in the figure, R1 introduces the default route through the "default-route-advertise always level-1" command. Which of the following descriptions is correct?

A default route will appear in R2's routing table

A default route will appear in R3's routing table

No default route will appear in the routing tables of R2 and R3

The default route will appear in both R2 and R3 routing tables

98. In the OSPF network shown in the figure, the area numbers are marked in the figure, where area 1 is an NSSA area, and areas 2 and 3 are common areas. The "default-route-advertise always" command is configured in the SPF process of R5. Which of the following routers have default routes in their routing tables? (Multiple choice)

99. By default, the cost type of IS-IS routes is narrow mode. In this mode, which of the following is the maximum value of the route cost?

65535

6777215

1023

100. The route reflector and its clients form a cluster, using the unique Cluster ID in the AS as an identifier. When a route is reflected by the RR for the first time, if there is no Cluster_List attribute, the RR will add the local Cluster ID to the front of the Cluster_List. If a route already has the Cluster_List attribute, the RR will no longer modify the Cluster_List attribute.

True

False

Page 11 of 12

101. In the network shown in the figure, OSPF protocol is run between R1, R2, and R3. IBGP neighbor relationship is established between R1 and R3 using loopback interface. If OSPF is shut down on R2's GE0/0/1 interface through "undo network xxxx yyyy" command, and BGP neighbor relationship is checked on R1, by default, the longest time for R1 BGP neighbor relationship to change from Up state to Dom state is which of the following?

10s

180s

60s

40s

102. In the network shown in the figure, R1, R2, R4, and R5 run IS-IS with area number 49.0001, and R3 and R6 run IS-IS with area number 49.0002.

Inside AS 65000, R1, R3, R4, and R6 all establish IBGP neighbor relationships with R2 and R5, where R2 and R5 are Rs and R1, R4, R3, and R6 are clients. IBGP neighbor relationships are all established using the Loopback0 interface. R2 and R5 also establish an IBGI neighbor relationship. The IP address of the Loopback0 interface of each device is 10.0.X.X/32, and the Router ID is 10.0.X.X, where X is the device number. R1 and R4 introduce the external network 192.168.1.0/24 into BGP through import. For 192.168.1.0/24, please match it according to the number of valid routes in the output information of "display bep routing-table".

103. Use the "display current-configuration |include 10.0.2.*" command on the router to see all the information including "10.0.2" in the current configuration.

True

False

104. In the network shown in the figure, OSPF protocol is running between R1, R2, and R3, and OSPF BFD feature is turned on. IBGP neighbor relationship is established between R1 and R3 using loopback interface. If GE0/0/1 interface of R2 is shut down, and BGP neighbor relationship is checked on R1, by default, which of the following is the longest time for R1 BGP neighbor relationship to change from Up state to Down state?

60s

180s

40s

105. In the OSPFv3 network shown in the figure, area 1 is a stub area, area 2 is a normal area, and area 3 is an NSSA area. The IPv6 address of the R6 Lopback0 interface is 2000::6/128. The Router ID of each device is 10.0.XX, where X is the device number. "stub no-summary" is configured in area 1 of R2. Which of the following descriptions is correct?

The R4 LSDB contains the Inter-Area-Prefix-LSA describing 2000::6/128 generated by R1.

The path for R4 to send data packets to 2000::6 is R4-R2-R6

There is no route entry for 2000::6/128 in R4's routing table.

The path for R4 to send data packets to 2000::6 is R4-R1-R5-R3-R6

106. In the OSPFv3 network shown in the figure, area 1 is a stub area, area 2 is a common area, and area 3 is an NSSA area. The IPv6 address of the R6 Loopback0 interface is 2000::6/128. The Router ID of each device is 10.0.XX, where X is the device number.

Which of the following descriptions are correct? (Multiple choice)

In area 3, there is an Inter-Area-Prefix-LSA describing 2000::6/128 generated by R1.

In area 0, there is an Inter-Area-Prefix-LSA describing 2000::6/128 generated by R1.

There is an Inter-Area-Prefix-LSA describing 2000::6/128 generated by R2 in Area 1

There is an Inter-Area-Prefix-LSA describing 2000::6/128 generated by R3 in Area 2

107. In the network shown in the figure, IS-IS IPv6 runs between R2, R6, and R3, and the IPv6 address of R6 Looback0 interface is 2000::6/128. Other links run OSPFv3, area 1 is a Stub area, and area 2 is an NSSA area.

IS-IS routes are imported into SPFv3 on R2 and R3. Which of the following descriptions are correct? (Multiple choice)

R4 routing table has a routing entry for 2000::6/128

R1 routing table has a routing entry for 2000::6/128

R5 routing table has a routing entry for 2000::6/128

R6 routing table has a routing entry of ::/0

108. In the network shown in the figure, R1 and R2 have established an EBGP neighbor relationship through the Loopback0 interface. R1 introduces the route 2001::1/128 into BGP. In the Update message sent by R1, the value of the Next Hop field in MP_REACH_RI is 2000::1.

True

False

109. The interface address of an OSPFv3 router is 2000::1/128. In which of the following types of LSAs is this prefix likely to appear? (Multiple choice)

Inter-Area-Prefix-LSA

Router-LSA

Inter-Area-Router-LSA

AS-External-LSA

110. In the IS-IS IPv6 network shown in the figure, all routers have multi-topology enabled. Configure "ipv6 default-route-advertise always level-1" in the R4 IS-IS process.

By default, which of the following routers has no default route in its routing table?

Page 12 of 12

111. In the OSPFv3 network shown in the figure, the OSPFv3 related parameters are the default configuration. When checking the LSDB on one of the devices, some content is omitted in the LSDB. The Router IDs of R1, R3, and R4 are 10.0.1.1, 10.0.3.3, and 10.0.4, respectively. The Origin Router part of some LSAs is hidden. Please complete this part.

112. In the OSPFv3 network shown in the figure, there are _______ Link-LSAs in R1's LSDB.

113. In the OSPFv3 network shown in the figure, the interfaces of R1 and R2 both have two IPv6 addresses. Although the prefix lengths of the IPv6 addresses of R1 and R2 are different, they can still establish an OSPFv3 neighbor relationship. If R2 is the DR, then the Intra-Area-Prefix-LSA generated by R2 will contain four prefixes.

True

False

114. There are three routers in an OSPFv3 network. The LSDB shown in the figure is seen on one of the routers.

Determine the role of the router based on its Router ID.

115. As shown in the figure, the network administrator deployed the DHCP Snooping trust function on the switch, where GE0/0/2 is the trusted interface and GE/0/3 is the untrusted interface.

Which of the following descriptions of these two interfaces are correct? (Multiple choice)

When the switch receives a DHCP request message from port GE0/0/2, it forwards the message from port GE0/0/3.

When the switch receives a DHCP response message from port GE0/0/2, it forwards the message from port GE0/0/1.

When the switch receives a DHCP response message from port GE0/0/3, it forwards the message from port GE0/0/1.

When the switch receives a DHCP request message from port GE0/0/3, it forwards the message from port GE0/0/2.

116. A campus network is connected through Huawei S series switches. The administrator has enabled the MAC drift detection function in the network. Which of the following descriptions of this function is wrong?

This function can report alarms, including MAC address, VLAN, hop interface and other information

If loops may occur only in a few VLANs in the network connected to the switch, it is recommended to configure the subsequent action to withdraw the interface from the VLAN instead of turning the interface Down.

After the switch turns on this function, it can integrate the MAC address drift information of the entire network and report the alarm

This function can provide interface protection actions, such as making the jump connection four Down to achieve automatic loop breaking

Huawei H12-831_V1.0 Questions and Answers

Huawei H12-831_V1.0 Questions and Answers

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