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Juniper JN0-351 Exam Syllabus Topics:

TopicDetails
Topic 1
  • BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Topic 2
  • Tunnels: The fundamentals of IP tunneling are emphasized, highlighting their requirements and functionalities. Mastery in configuring, monitoring, and troubleshooting tunnels equips professionals to meet the demands of the JN0-351 exam.
Topic 3
  • High Availability: This topic covers the importance and application of high availability within Junos OS environments. Knowledge in configuring and managing these components is critical for ensuring robust and uninterrupted network operations, aligning with exam expectations.
Topic 4
  • OSPF: The concepts and operational details of OSPF are explored, providing tools for routing efficiency. Configuration and troubleshooting mastery ensure readiness for both the exam and complex enterprise environments.
Topic 5
  • IS-IS: Aspiring Juniper networking professionals enhance their understanding of IS-IS routing protocols. This topic equips candidates with the knowledge to configure and monitor IS-IS systems, addressing specific exam challenges and practical applications.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q161-Q166):

NEW QUESTION # 161
Based on the output shown in the exhibit, which statement is correct?

Answer: A


NEW QUESTION # 162
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.)

Answer: B,C,D

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.


NEW QUESTION # 163
What are two characteristics of RSTP alternate ports? (Choose two.)

Answer: A,C

Explanation:
* A is correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port 1 . However, an alternate port does not forward any traffic, as it is in a discarding state 2 . It only listens to BPDUs and waits for the root port to fail. If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port 1 .
* C is correct because RSTP alternate ports provide an alternate higher cost path to the root bridge. An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID 3 . However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself 1 .
Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.


NEW QUESTION # 164
You are asked to explore adding BGP route reflectors to allow for increased scale in your core network. Which statement is correct in this scenario?

Answer: B


NEW QUESTION # 165
Which two statements correctly describe RSTP port roles? (Choose two.)

Answer: A,C

Explanation:
An RSTP topology contains ports that have specific roles:
The root port is responsible for forwarding data to the root bridge.
The alternate port is a standby port for the root port. When a root port goes down, the alternate port becomes the active root port.
The designated port forwards data to the downstream network segment or device.
The backup port is a backup port for the designated port. When a designated port goes down, the backup port becomes the active designated port and starts forwarding data.


NEW QUESTION # 166
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