Juniper Data Center, Associate (JNCIA-DC) - JN0-281 Exam Questions [2026]

QUESTION NO: 1
Which two statements describe an OSPF ABR? (Choose two.)

A. By default, an ABR does not need to have any links in the backbone area. B. By default, an ABR must have one link in the OSPF backbone area. C. By default, an ABR is an OSPF router with all of its links in one area. D. By default, an ABR is an OSPF router with links in two areas.

Correct Answer: B,D

QUESTION NO: 2
You are creating an IP fabric underlay and want to use OSPF as your routing protocol.
In this scenario, which statement is correct?

A. All spine devices must use the same router I B. All leaf devices must be configured in separate OSPF areas. C. All leaf and spine devices must be the same model to ensure the proper load-balancing behavior. D. Interface speeds should be the same throughout the fabric to ensure that all links are utilized.

Correct Answer: D

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QUESTION NO: 3
Referring to the exhibit, which two statements are correct about the IP fabric? (Choose two.)

A. Only traffic between pods must traverse the super spine devices. B. All traffic must traverse the super spine devices. C. This is a three-stage IP fabric. D. This is a five-stage fabric.

Correct Answer: A,D

QUESTION NO: 4
How does VLAN tagging benefit network segmentation?

A. By encrypting data traffic between VLANs. B. By enabling the identification and separation of traffic belonging to different VLANs. C. By providing a backup path for data in case of link failure. D. By ensuring the same IP address range can be used in different VLANs.

Correct Answer: B

QUESTION NO: 5
What is the primary use of Martian addresses in network routing?

A. To define addresses used for multicasting. B. To configure virtual IP addresses for load balancing. C. To create a backup routing plan. D. To identify addresses that should be excluded from routing.

Correct Answer: D

QUESTION NO: 6
Exhibit:

Referring to the exhibit, which behavior does this configuration enable on the ge-0/0/1.0 interface?

A. This configuration enables a MAC address learned on the interface to be persistently retained in the Ethernet-switching table, even after a reboot. B. This configuration enables the device to shut down the interface when a particular MAC address persistently sends broadcast traffic. C. This configuration enables the interface to learn and remember MAC addresses, until the device is rebooted. D. This configuration enables the device to place a MAC address that persistently causes network errors into a special protected VLAN.

Correct Answer: A

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QUESTION NO: 7
Referring to the exhibit, what needs to be done to make this a valid IP fabric?

A. Remove the connection between the leaf nodes B. Remove one of the redundant links between a leaf node and a spine node C. Add a connection between the spine nodes D. Add two connections between the spine nodes

Correct Answer: A

QUESTION NO: 8
When configuring High Availability components, which of the following practices are recommended? (Choose two)

A. Implement regular testing of failover mechanisms. B. Ensure physical redundancy of critical components. C. Regularly update firmware to non-recommended versions. D. Use a single path for data and control traffic.

Correct Answer: A,B

QUESTION NO: 9
What is the primary function of a VLAN?

A. To encrypt network traffic. B. To segment a network into multiple broadcast domains. C. To control network traffic based on MAC addresses. D. To provide a routing mechanism between different networks.

Correct Answer: B