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Juniper JN0-351 Exam Dumps

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JN0-351 Pack
Vendor: Juniper
Exam Code: JN0-351
Exam Name: Enterprise Routing and Switching, Specialist
Exam Questions: 65
Last Updated: April 12, 2026
Related Certifications: Juniper Data Center Certification
Exam Tags: Specialist Juniper experienced networking professionals
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Free Juniper JN0-351 Exam Actual Questions

Question No. 1

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.)

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Correct Answer: A, B, C

Ais 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 connected1.By default, EBGP peers use a time-to-live (TTL) value of 1 for their packets, which means that they can only reach adjacent neighbors1.However, if you configure BGP multihop with a higher TTL value, you can allow EBGP peers to communicate over multiple routers in between1. This can provide redundancy in case of a link failure or a router failure between the EBGP peers.

Bis 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 interfaces2.Loopback interfaces are virtual interfaces that are always up and reachable as long as the router is operational2.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 peer2. This can provide redundancy and load balancing for the EBGP peering.

Cis 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 hops2.You can use static routes or dynamic routing protocols to advertise and learn the routes for the peer loopback interface IP addresses2. Without these routes, the routers will not be able to establish or maintain the BGP session using their loopback interfaces.


Question No. 2

Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)

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Correct Answer: B, C

Option B is correct.Flooding is a mechanism used in Layer 2 bridging where the switch sends incoming packets to all its ports except for the port where the packet originated1.This is done when the switch doesn't know the destination MAC address or when the packet is a broadcast or multicast1.

Option C is correct.Learning is another mechanism used in Layer 2 bridging where the switch learns the source MAC addresses of incoming packets and associates them with the port on which they were received23.This information is stored in a MAC address table, also known as a bridge table23.

Option A is incorrect.Blocking is a state in Spanning Tree Protocol (STP) used to prevent loops in a network2.It's not a mechanism used in building and maintaining a Layer 2 bridge table2.

Option D is incorrect.Listening is also a state in Spanning Tree Protocol (STP) where the switch listens for BPDUs to make sure no loops occur in the network before transitioning to the learning state2.It's not a mechanism used in building and maintaining a Layer 2 bridge table2.


Question No. 3

Which statement is correct about graceful Routing Engine switchover (GRES)?

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Correct Answer: C

The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails1.GRES preserves interface and kernel information, ensuring that traffic is not interrupted1.However, GRES does not preserve the control plane1.

To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR)1.When GRES is combined with NSR, nearly 75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES1.Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur1.

Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd1.


Question No. 4

Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems? (Choose two.)

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Correct Answer: A, C

BGP (Border Gateway Protocol) is a protocol designed to exchange routing and reachability information among autonomous systems (AS) on the internet1.

Option A is correct.When an EBGP router advertises routes to its neighbors, it appends its AS number to the AS_PATH attribute1.This is a key mechanism in BGP to prevent routing loops1.

Option C is correct.BGP has a built-in loop prevention mechanism whereby if a BGP router detects its own AS in the AS_PATH attribute, it will drop the prefix and will not continue to advertise it2.This helps to prevent routing loops2.

Option B is incorrect.EBGP routers do not accept routes that contain their own AS number in the AS_PATH2.Instead, they drop such routes as part of the loop prevention mechanism2.

Option D is incorrect.While it's true that EBGP routers append their AS number when advertising routes, they do not prepend their AS number1.The term ''prepend'' in BGP usually refers to a technique used to influence path selection by artificially lengthening the AS_PATH3.


Question No. 5

You want to ensure traffic is routed through a GRE tunnel.

In this scenario, which two statements will satisfy this requirement? (Choose two.)

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Correct Answer: A, B

Option A is correct. For traffic to be sent through a GRE tunnel, there must be a route that directs the traffic into the tunnel. This is typically accomplished through the use of a static route or a dynamic routing protocol.

Option B is correct. All intermediary devices must have a route to the tunnel endpoints34. In real-world scenarios, the tunnel endpoints for a tunnel going over the Internet must have globally reachable internet addresses. Otherwise, intermediate routers in the Internet cannot forward the tunneled packets.


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