JN0-281 Data Center, Associate (JNCIA-DC) Exam Free Dumps

dumps2025-03-22T09:24:37+08:00

It is easy for you to pass JN0-281 Data Center, Associate (JNCIA-DC) exam now. Learning Juniper JN0-281 exam information is the first step in your preparation. There are 65 multiple-choice questions in real Juniper JN0-281 exam, and you have 90 minutes to answer all the questions. You can register Juniper JN0-281 exam at Pearson VUE testing center. The software version is Junos 24.2. We provide the latest Juniper JNCIA-DC JN0-281 exam dumps, which are your best material to pass the test easily. Free Data Center, Associate (JNCIA-DC) JN0-281 exam dumps are available below.

Page 1 of 6

1. Which of the following is an important consideration when configuring BFD?

Setting a very high multiplier to avoid false positives

Using the same BFD interval on all devices in the network

Adjusting the BFD interval and multiplier according to network needs

Disabling all other failure detection mechanisms

2. In the context of Layer 2 switching, what does RSTP stand for?

Rapid Spanning Tree Protocol

Routing Switch Transport Protocol

Redundant Switching Tree Protocol

Resilient Switching Transport Protocol

3. What is the default route preference for a static route on a Junos device?

130

4. Which statement is correct about a five-stage IP fabric topology?

There is a maximum of five hops between any end-devices

They are commonly referred to as interconnected data centers

There is a maximum of three hops between any end-devices

They are typically deployed in small to medium data centers

5. What is the primary purpose of using aggregate routes in a network?

To dynamically adjust to network changes

To summarize and reduce the number of routes in the routing table

To filter unwanted traffic

To statically define a route to a specific destination

6. In the context of data center networking, what is the primary purpose of an Underlay Network?

To provide a physical infrastructure for an Overlay Network.

To handle external network connections exclusively.

To facilitate virtual machine migrations.

To encrypt data traffic between servers.

7. What is the primary difference between IBGP and EBGP?

The way they advertise routes

The administrative distance

The use of AS_PATH attribute

The requirement for a full mesh topology

8. What is an advantage of using BFD?

BFD is so lightweight that each protocol will generate its own unique BFD session by default, to replace its own hello messages.

BFD built to handle the routing table of the entire Internet, and can safely redistribute it into OSP

One BFD monitoring session can be used by multiple protocols.

BFD is built to handle the routing table of the entire Internet, unlike IGP

9. Bidirectional Forwarding Detection (BFD) is primarily used for:

Encrypting data packets

Detecting slow links in the network

Quick failure detection in forwarding paths

Aggregating multiple links

10. What is the function of the 'Weight' attribute in BGP, and where is it used in the route selection process?

It is used to prioritize routes received from different EBGP peers and is considered before the AS_PATH attribute.

It determines the stability of a route and is checked after the Local Preference attribute.

It is a Cisco-specific attribute used to prefer paths from one BGP speaker over another, evaluated before the Local Preference.

It is used to balance load among multiple links and is considered after the MED attribute.

Page 2 of 6

11. VLANs help in reducing which of the following? (Choose two)

Collision domains

Broadcast domains

Routing complexity

Encryption requirements

12. In the Junos OS, what is the default behavior of a switch when it receives a frame with an unknown destination MAC address?

It discards the frame.

It floods the frame out of all ports except the one it was received on.

It sends the frame to its default gateway.

It buffers the frame until the MAC address can be learned.

13. Which of the following BGP attributes is considered first in the route selection process?

Local Preference

AS Path Length

Origin

MED

14. When troubleshooting issues with static routes, what is a key factor to check first?

If the routing table has enough memory

The correctness of the specified next-hop addresses

The speed of the router's CPU

The number of aggregate routes configured

15. What is the main advantage of using an Overlay Network in a data center?

It simplifies physical network design by allowing multiple virtual topologies over it.

It replaces the need for physical network infrastructure.

It offers higher physical bandwidth capacity.

It provides direct Internet access to applications.

16. What are the different OSPF area types? (Choose two)

Stub Area

Not-So-Stubby Area (NSSA)

Default-Free Zone

Virtual Link Area

17. In OSPF, what is the function of the Link-State Database (LSDB)?

To store OSPF routing tables.

To maintain a list of OSPF neighbors.

To keep the topology structure of the network.

To log changes in network topology.

18. What are two characteristics of a typical EBGP underlay fabric? (Choose two.)

Each device in an EBGP fabric will be configured in its own unique private A

Each device in an EBGP fabric will be configured to be part of the same private A

An EBGP fabric relies on an IGP to advertise loopback IPs.

An EBGP fabric does not require an IGP to advertise loopback IPs.

19. Referring to the exhibit, how many broadcast domains are present in the topology?

20. How can OSPF be configured to prefer one route over another?

By setting a higher cost on the preferred route.

By configuring route redistribution.

By adjusting interface bandwidth.

By setting a lower cost on the preferred route.

Page 3 of 6

21. In the context of protocol-independent routing, what is the main difference between static and generated routes?

Static routes require manual configuration, while generated routes are created dynamically.

Static routes are used for load balancing, while generated routes are not.

Generated routes support summarization, while static routes do not.

Generated routes are manually configured, while static routes are automatically created.

22. Which LSA types are associated with OSPF? (Choose three)

Router LSA (Type 1)

Network LSA (Type 2)

Summary LSA (Type 3)

External LSA (Type 5)

23. Referring to the exhibit, which statement is correct?

The ge-0/0/0 interface has been explicitly assigned to a VLAN named default.

The default VLAN is a user defined VLAN name.

The asterisk indicates that the interface is active.

The ge-0/0/12 interfaces is an access port.

24. Which of the following is a key benefit of implementing High Availability (HA) in a network?

Reduced network security

Increased network downtime

Enhanced data redundancy

Slower data recovery

25. In OSPF, which command is commonly used to monitor neighbor relationships?

show ip ospf neighbors

show ospf database

show ip route ospf

show ospf interfaces

26. What protocol and port does BGP use for control plane communication?

protocol TCP, port 179

protocol UDP, port 179

protocol TCP, port 159

protocol UDP, port 159

27. Referring to the exhibit, how many milliseconds will pass before the BGP neighbor is considered dead?

1000ms

9000ms

2000ms

3000ms

28. What is the purpose of using route reflectors in BGP?

To encrypt BGP messages

To reduce the number of required IBGP sessions in a network

To increase the speed of BGP convergence

To automatically select the best route

29. What does the “qualified-next-hop” feature do when configuring a static route?

It allows you to specify an independent route preference value for an additional next hop.

It specifies the IP address of the directly connected device.

It instructs the device to verify the next-hop is reachable before activating the route.

It instructs the device to looks up a static route’s next-hop that is not directly connected.

30. In the context of Ethernet bridging on Junos devices, what is the purpose of the Spanning Tree Protocol (STP)?

To prevent routing loops.

To provide a mechanism for VLAN tagging.

To prevent Layer 2 switching loops.

To filter MAC addresses.

Page 4 of 6

31. Which statement is correct about the OSPF link-state database?

Each router within the same area must maintain a unique copy of the link-state database.

Each router within the same area must maintain an identical copy of the link-state database.

Each router within the OSPF domain must maintain a unique copy of the link-state database.

Each router within the OSPF domain must maintain an identical copy of the link-state database.

32. In a Spine/Leaf IP-Fabric architecture, what is the primary role of the leaf switches?

To provide direct connectivity to servers.

To interconnect different data centers.

To perform deep packet inspection.

To manage the overall data center network.

33. What is the primary function of a VLAN?

To encrypt network traffic.

To provide a routing mechanism between different networks.

To segment a network into multiple broadcast domains.

To control network traffic based on MAC addresses.

34. What roles do the Designated Router (DR) and Backup Designated Router (BDR) play in OSPF?

They redistribute routes between OSPF and non-OSPF networks.

They are responsible for generating LSAs for external routes.

They reduce the number of adjacencies on broadcast networks.

They determine the shortest path first algorithm.

35. Which two statements are correct about BGP? (Choose two.)

IBGP peers do not advertise routes learned from IBGP peers to other IBGP peers.

EBGP uses the AS path to avoid loops.

IBGP sessions are typically established between physical router interfaces.

EBGP sessions are typically established between router loopback interfaces.

36. Which of the following are correct about OSPF router ID selection? (Choose two)

It can be manually configured.

It is chosen based on the highest IP address of any active interface by default.

It is always the IP address of the loopback interface.

It is selected based on the lowest MAC address.

37. EVPN/VXLAN is primarily used in modern data centers to:

Increase the physical distance between data centers.

Provide Layer 2 connectivity over a Layer 3 network.

Replace traditional routing protocols.

Enhance the physical security of the data center.

38. With regards to graceful restart, which two statements are true? (Choose two.)

A supported routing protocol, such as BGP, must be operational for graceful restart to work.

NSR must be enabled for graceful restart to work.

Dual routing engines are required for graceful restart to work.

The network topology must be stable for graceful restart to work.

39. Which command on a router is used to view the current routing table?

show routing-table

show route

display ip routing-table

check route information

40. What does filter-based forwarding in networking typically allow?

Forwarding decisions based on MAC addresses

Load balancing across multiple CPUs

Routing decisions based on extended criteria like packet headers

Aggregation of multiple routes into a single entry

Page 5 of 6

41. In troubleshooting a Virtual Chassis setup, what is a common issue to look for?

Incompatible software versions between member switches

Too many switches in a single Virtual Chassis configuration

Use of copper cables for inter-switch connections

Activation of all ports for Virtual Chassis connections

42. In OSPF, which term refers to routers that have interfaces in multiple areas?

Internal Routers

Backbone Routers

Area Border Routers (ABRs)

Autonomous System Boundary Routers (ASBRs)

43. Which of the following are true about Layer 2 and Layer 3 strategies in data center architectures? (Choose two)

Layer 2 strategies are typically used for creating large, flat networks.

Layer 3 strategies cannot be used in conjunction with Layer 2 environments.

Layer 3 strategies help in reducing broadcast domains.

Layer 2 strategies are primarily used for inter-data center connectivity.

44. When configuring static routes, which command is typically used?

set protocols static route

set route aggregate

set firewall filter

set routing-options rib-groups

45. Which Junos operational mode command is used to troubleshoot issues with VLANs?

show vlans

monitor traffic

show ethernet-switching table

show interfaces

46. Which two statements are correct about aggregated Ethernet bundles? (Choose two.)

You must enable the chassis to support aggregated Ethernet interfaces.

You must purchase a services license for the chassis to support aggregate Ethernet interfaces.

You must specify which interfaces are members of a specific aggregated Ethernet bundle.

You must enable LACP when configuring aggregated Ethernet bundles.

47. Referring to the exhibit, what needs to be done to make this a valid IP fabric?

Remove the connection between the leaf nodes

Remove one of the redundant links between a leaf node and a spine node

Add two connections between the spine nodes

Add a connection between the spine nodes

48. What is the main advantage of using MACsec?

It increases the speed of the network.

It provides Layer 2 encryption for data confidentiality and integrity.

It creates multiple virtual networks over a single physical infrastructure.

It allows for the use of longer cable runs.

49. When configuring BGP, which command is commonly used to define a BGP neighbor?

bgp set neighbor

neighbor <IP_ADDRESS> remote-as <AS_NUMBER>

set bgp peer

add bgp connection

50. What is the first route selection mechanism for IBGP?

as path

MED

local preference

origin

Page 6 of 6

51. What happens if a frame with a known destination MAC address enters a switch?

The egress PFE performs a MAC address lookup and determines the ingress PFE and port.

The ingress PFE sends the header information to the R

The ingress PFE performs a MAC address lookup and determines the egress PFE and port.

The MAC address is added to the bridge table.

52. Which statement is correct about OSPF?

OSPF is link-state protocol

OSPF is a path-vector protocol

OSPF is a distance-vector protocol

OSPF is a device-state protocol

53. How does VLAN tagging benefit network segmentation?

By encrypting data traffic between VLANs.

By ensuring the same IP address range can be used in different VLANs.

By enabling the identification and separation of traffic belonging to different VLANs.

By providing a backup path for data in case of link failure.

54. In networking, what is a RIB group primarily used for?

To balance the load across multiple links

To filter routes based on specific criteria

To group multiple Routing Information Bases together for a common purpose

To dynamically generate routing entries

55. Fill in the blank: In BGP, a route received from an ___________ peer will not be advertised to another ___________ peer by default.

IBGP, IBGP

EBGP, EBGP

EBGP, IBGP

Static, Dynamic

56. Which of the following are true regarding port modes in a VLAN setup? (Choose two)

An access port can carry traffic for multiple VLANs.

A trunk port can carry traffic for multiple VLANs.

An access port carries traffic only for a single VLA

A trunk port is used exclusively for inter-switch links.

JN0-281 Data Center, Associate (JNCIA-DC) Exam Free Dumps

JN0-281 Data Center, Associate (JNCIA-DC) Exam Free Dumps

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