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Juniper JN0-351 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Layer 2 Security: This topic introduces Layer 2 protection mechanisms and firewall filters to fortify network security. Practical skills in configuring, monitoring, and troubleshooting these features prepare candidates to address exam objectives and real-world challenges effectively.
Topic 2
  • Spanning Tree: Networking professionals explore the principles and advantages of the Spanning Tree Protocol (STP) to ensure loop-free topologies in Layer 2 networks.
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
  • 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 (Q16-Q21):

NEW QUESTION # 16
Which statement is correct about the exhibit?

Answer: D


NEW QUESTION # 17
Exhibit.

Why is this OSPF adjacency remaining in this state?

Answer: B

Explanation:
* The exhibit shows the output of the command show ospf neighbor , which displays information about the OSPF neighbors on a router 1 .
* The output shows that the OSPF neighbor with the address 172.26.1.1 and the interface ge-0/0/3.0 is in the Exstart state 1 .
* The Exstart state is the fourth state in the OSPF neighbor formation process, after Down, Init, and 2- Way states 2 . In this state, the OSPF neighbors establish a master-slave relationship and exchange database description (DBD) packets, which contain summaries of their link-state databases 2 .
* The most common reason for OSPF neighbors to be stuck in the Exstart state is an MTU mismatch between the interfaces 3 . MTU stands for maximum transmission unit, which is the largest size of a packet that can be transmitted on a network segment 4 . If the MTU values of two OSPF neighbors are different, they may not be able to exchange DBD packets successfully, as some packets may be dropped or fragmented due to their size exceeding the MTU limit 3 .
* To solve this problem, you need to ensure that the MTU values of both OSPF neighbors are the same or compatible. You can use the command show interfaces to display the MTU value of an interface 5 .
You can also use the command ping with the do-not-fragment option to test the MTU size between two routers. You can change the MTU value of an interface by using the command set interfaces interface-name mtu mtu-value in configuration mode 5 .


NEW QUESTION # 18
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)

Answer: C,D

Explanation:
BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention 1
. There are four categories of BGP attributes 1 2 3 :
* Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers 1 2 3 .
* Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates 1 .
* Optional transitive: May not be supported by all implementations of BGP 1 .
* Optional non-transitive: May not be supported by all implementations of BGP 1 .
The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update 1 2 3 . These include the AS path and next hop attributes 2 3 . Therefore, options A and C are correct.


NEW QUESTION # 19
What are two purposes of an aggregate route? (Choose two.)

Answer: B,C

Explanation:
An aggregate route is a route that summarizes multiple more specific routes into a single route advertisement.
For example, an aggregate route to 10.0.0.0/8 can represent many routes to 10.x.x.x/24 subnets. An aggregate route has several purposes, such as:
To decrease the number of route advertisements: By consolidating multiple routes into one, an aggregate route reduces the size of the routing table and the amount of routing updates that need to be exchanged between routers. This can improve the scalability and efficiency of the network12.
To hide internal routes from external peers: By advertising only the aggregate route and not the more specific routes, an aggregate route can provide a level of abstraction and security for the internal network topology. This can prevent external peers from knowing the details of the internal routes and avoid potential attacks or misconfigurations13.
The other options are not correct because:
C). To allow external peers to see internal routes: This is the opposite of what an aggregate route does. An aggregate route hides the internal routes from external peers, not exposes them13.
D). To increase the number of route advertisements: This is also the opposite of what an aggregate route does. An aggregate route decreases the number of route advertisements, not increases them12.
References: Configuring Route Aggregation | Junos OS, JunOS Aggregate and Generate Routes - Network Direction, Aggregate Routes vs Generated Routes. | Junos OS - Juniper Networks


NEW QUESTION # 20
Which statement correctly describes the purpose of the Junos OS "graceful restart" feature?

Answer: C

Explanation:
Graceful restart allows a router experiencing a Routing Engine restart or switchover (such as in a dual Routing Engine or high availability scenario) to continue forwarding traffic based on its existing forwarding table while routing protocol adjacencies are re-established, minimizing traffic disruption during the recovery process.


NEW QUESTION # 21
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