JN0-351 Juniper Enterprise Routing and Switching Specialist (JNCIS-ENT) exact Exam Questions

Enterprise Routing and Switching Specialist (JNCIS-ENT)

Last Update 11 hours ago Total Questions : 107

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Question # 4

You enable persistent MAC learning on your Juniper switch

In this scenario, which statement is correct?

You can enable persistent MAC learning on an interface where MAC learning is disabled.

You can enable persistent MAC learning on an interface that is part of a redundant trunk group.

You can only enable persistent MAC learning on an interface in access mode.

You can only enable persistent MAC learning on an interface on which 802.1x authentication is configured.

Question # 5

Click the Exhibit button.

Which statement concerning Bidirectional Forwarding Detection (BFD) is true for the configuration shown in the exhibit?

The effective interval for neighbor 172.30.1.2 is 500 ms.

The effective interval for neighbor 192.168.100.2 is 500 ms.

The link 1o neighbor 192.168.100.2 is not using BFD.

The minimum-interval must match on both ends.

Question # 6

Click the Exhibit button.

R1 has a BGP session with a router that has a peer autonomous system number of 64501. It is exchanging routes, and is advertising those routes to IBGP peers. The downstream IBGP

peers, however, cannot pass traffic to the advertised networks.

Referring to the exhibit, which configuration change must occur to solve this problem?

The BGP group ext-64501 must include the export next-hop-self policy.

The BGP group int-64503 must include the import next-hop-self policy.

The BGP group ext-64501 must include the import next-hop-self policy.

The BGP group int-64503 must include the export next-hop-self policy.

Question # 7

You are configuring a router as a new Level 1 router in an existing Level 1 area. The NET address for an existing Level 1 router is 49.0011.1111.2222.3333.00. The new router must form a Level 1 adjacency with the existing router.

What should be the area ID in this scenario?

0011

3333

Question # 8

Exhibit

You are a network operator troubleshooting BGP connectivity.

Which two statements are correct about the output shown in the exhibit? (Choose two.)

Peer 10.32.1.2 is configured for AS 63645.

The BGP session is not established.

The R1 is configured for AS 65400.

The routers are exchanging IPv4 routes.

Question # 9

You need to configure a LAG between your switches. In this scenario, which two statements are correct? (Choose two.)

Duplex and speed settings are not required to match on both participating devices.

Duplex and speed settings are required to match on both participating devices.

Member links are not required to be contiguous ports.

Member links are required to be contiguous ports.

Question # 10

Exhibit.

You want to enable redundancy for the EBGP peering between the two routers shown in the exhibit. Which three actions will you perform in this scenario? (Choose three.)

Configure BGP multihop.

Configure loopback interface peering.

Configure routes for the peer loopback interface IP addresses.

Configure an MD5 peer authentication.

Configure a cluster ID.

Answer:

A, B, C

Explanation:

A is correct because you need to configure BGP multihop to enable redundancy for the EBGP peering between the two routers. BGP multihop is a feature that allows BGP peers to establish a session over multiple hops, instead of requiring them to be directly connected 1 . By default, EBGP peers use a time-to-live (TTL) value of 1 for their packets, which means that they can only reach adjacent neighbors 1 . However, if you configure BGP multihop with a higher TTL value, you can allow EBGP peers to communicate over multiple routers in between 1 . This can provide redundancy in case of a link failure or a router failure between the EBGP peers.

B is correct because you need to configure loopback interface peering to enable redundancy for the EBGP peering between the two routers. Loopback interface peering is a technique that uses loopback interfaces as the source and destination addresses for BGP sessions, instead of physical interfaces 2 . Loopback interfaces are virtual interfaces that are always up and reachable as long as the router is operational 2 . By using loopback interface peering, you can avoid the dependency on a single physical interface or link for the BGP session, and use multiple paths to reach the loopback address of the peer 2 . This can provide redundancy and load balancing for the EBGP peering.

C is correct because you need to configure routes for the peer loopback interface IP addresses to enable redundancy for the EBGP peering between the two routers. Routes for the peer loopback interface IP addresses are necessary to ensure that the routers can reach each other’s loopback addresses over multiple hops 2 . You can use static routes or dynamic routing protocols to advertise and learn the routes for the peer loopback interface IP addresses 2 . Without these routes, the routers will not be able to establish or maintain the BGP session using their loopback interfaces.

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