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Title: JN0-351 Question Explanations - Exam JN0-351 Outline [Print This Page]

Author: graceev976    Time: 1/21/2026 17:35
Title: JN0-351 Question Explanations - Exam JN0-351 Outline
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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
  • 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
  • Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
Topic 4
  • Layer 2 Switching or VLANs: This topic deepens the understanding of Layer 2 switching operations within the Junos OS, including VLAN concepts and benefits. Experienced networking professionals gain insights into configuration, monitoring, and troubleshooting techniques essential for network segmentation and efficiency.
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.

>> JN0-351 Question Explanations <<
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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q141-Q146):NEW QUESTION # 141
Which two statements correctly describe RSTP port roles? (Choose two.)
Answer: A,D
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 # 142
You are asked to create a default route that will be advertised to your internal OSPF neighbors.
You have three upstream connections to the Internet and you must ensure that when available, all traffic uses ISP1 as your primary connection and only uses ISP2 and ISP3 when ISP1 is not available. Which solution should you implement in this scenario?
Answer: A

NEW QUESTION # 143
Exhibit

You are a network operator troubleshooting BGP connectivity.
Which two statements are correct about the output shown in the exhibit? (Choose two.)
Answer: A,C
Explanation:
Explanation
Option B suggests that the BGP session is not established. This is correct because in the output, the state of the BGP session is shown as "Idle". In BGP, an "Idle" state means that the BGP session is not currently established1.
Option C suggests that R1 is configured for AS 65400. This is also correct because in the output, it's shown that the local AS number is 654001. The local AS number represents the Autonomous System (AS) number of the router on which you're checking the BGP session1.

NEW QUESTION # 144
What does the * indicate in the output shown in the exhibit?

Answer: A
Explanation:
The exhibit shows the output of the command show vlans brief, which displays brief information about VLANs and their associated interfaces.
The output has four columns: Routing instance, VLAN name, Interfaces, and Tagging. The * symbol indicates that the interface is active, meaning that it is up and forwarding traffic. This can be verified by the command show interfaces terse, which displays the status of the interfaces.

NEW QUESTION # 145
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)
Answer: B,D
Explanation:
Explanation
BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention1. There are four categories of BGP attributes123:
Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers123.
Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates1.
Optional transitive: May not be supported by all implementations of BGP1.
Optional non-transitive: May not be supported by all implementations of BGP1.
The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update123. These include the AS path and next hop attributes23. Therefore, options A and C are correct.

NEW QUESTION # 146
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