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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	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.
Topic 2	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 3	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Topic 4	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 5	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 6	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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q67-Q72):

NEW QUESTION # 67
Exhibit

Referring to the exhibit, which statement is correct?

A. The root bridge has not been elected for this RSTP topology.
B. The root bridge is using a bridge priority of 4k.
C. The local device is the root bridge for this RSTP topology.
D. The local device is using a bridge priority of 4k.

Answer: C

Explanation:
In a Rapid Spanning Tree Protocol (RSTP) topology, the root bridge is determined by the switch with the lowest bridge priority value 1 2 . If all switches have the same priority, then the root bridge is assigned to the switch whose MAC address's hex value is the lowest 2 . The default bridge priority value is 32768 3 2 .
However, without the actual exhibit, it's difficult to definitively determine which device is the root bridge. But based on the options provided, if we assume that the local device has a lower bridge priority or a lower MAC address than other devices in the network, then it could be considered as the root bridge for this RSTP topology 4 5 .

NEW QUESTION # 68
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)

A. MED
B. next hop
C. AS path
D. community

Answer: B,C

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

NEW QUESTION # 69
You have configured OSPF routing as shown in the exhibit. You notice that all interfaces have formed full adjacencies, with the exception of the interfaces connecting R3 and R4 with a status of 2Way.

What is the reason for this status?

A. The interface-type is not configured as p2p.
B. The two routers must both be configured as DR routers.
C. The two routers must be configured in different areas.
D. DROther routers will not form a full adjacency with each other.

Answer: D

NEW QUESTION # 70
You need to configure a LAG between your switches. In this scenario, which two statements are correct? (Choose two.)

A. Member links are required to be contiguous ports.
B. Duplex and speed settings are not required to match on both participating devices.
C. Duplex and speed settings are required to match on both participating devices.
D. Member links are not required to be contiguous ports.

Answer: C,D

Explanation:
Up to 64 Ethernet interfaces can be grouped to form a LAG, and In a Junos Fusion, up to 1,000 LAGs are supported on QFX10002 switches acting as aggregation devices.
The LAG must be configured on both sides of the link.
The interfaces on either side of the link must be set to the same speed and be in full-duplex mode.

NEW QUESTION # 71
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)

A. The lo0 interface is not included as an IS-IS interface.
B. IP subnets are not a /30 address.
C. MTU is not at least 1492 bytes.
D. The Level 2 routers have mismatched areas.

Answer: A,C

Explanation:
Explanation
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies1. If the MTU is less than this, IS-IS adjacencies will not be established1.
Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS1. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established1.
Therefore, options A and D are correct.

NEW QUESTION # 72
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