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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	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 3	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 4	Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q88-Q93):

NEW QUESTION # 88
Your GRE tunnel is not transitioning to the Upstatus. What would be the first step in troubleshooting the problem?

A. Verify tunnel endpoint reachability.
B. Verify that the routing instance for GRE tunnels is created.
C. Verify that the status of the management interface is up.
D. Verify the status of the management routing instance.

Answer: A

NEW QUESTION # 89
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

A. If the active link fails, then the secondary link automatically takes over.
B. Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.
C. Layer 2 control traffic is permitted on the secondary link.
D. Redundant trunk groups load balance traffic across two designated uplink interfaces.

Answer: A,C

Explanation:
* C is correct because Layer 2 control traffic is permitted on the secondary link of a redundant trunk group (RTG) on EX Series switches. Layer 2 control traffic includes protocols such as LLDP, LACP, and STP, which are used to exchange information and coordinate actions between switches 1
. According to the Juniper Networks documentation 2 , Layer 2 control traffic is allowed to pass through both the active and the secondary links of an RTG, but data traffic is only forwarded through the active link. This allows the switches to maintain their Layer 2 adjacencies and monitor the link status on both links.
* D is correct because if the active link fails, then the secondary link automatically takes over in an RTG on EX Series switches. An RTG consists of two trunk links: an active or primary link, and a secondary or backup link 2 . The active link is used to forward data traffic, while the secondary link is in standby mode. If the active link fails or becomes unavailable, the secondary link immediately transitions to a forwarding state and takes over the data traffic without waiting for normal STP convergence 2 . This provides fast recovery and redundancy for the network.

NEW QUESTION # 90
What are two characteristics of RSTP alternate ports? (Choose two.)

A. RSTP alternate ports are active ports used to forward frames toward the root bridge.
B. RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.
C. RSTP alternate ports provide an alternate higher cost path to the root bridge.
D. RSTP alternate ports provide an alternate lower cost path to the root bridge.

Answer: B,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 port1. However, an alternate port does not forward any traffic, as it is in a discarding state2. 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 port1.
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 ID3. However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself1. Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.

NEW QUESTION # 91
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?

A. The cluster ID is not required to use route reflectors.
B. Route reflectors require that the network is connected in a physical full mesh.
C. The cluster ID is required to prevent routing loops.
D. Route reflectors are required whenever internal BGP (IBGP) sessions are needed.

Answer: C

Explanation:
A route reflector is a BGP router that is allowed to break the iBGP loop avoidance rule and advertise routes received from an iBGP peer to another iBGP peer under specific conditions 1 . A route reflector can have three types of peerings: EBGP neighbor, IBGP client neighbor, and IBGP non-client neighbor 2 . A cluster is a group of route reflectors and their clients that are fully meshed 3 . The cluster ID is a 4-byte value that identifies the route reflector cluster and is carried in the ORIGINATOR_ID attribute of the BGP update message 4 . The cluster ID is used to prevent routing loops among route reflectors and their clients. If a route reflector receives a route with its own cluster ID, it discards the route 5 . Therefore, the cluster ID is required to prevent routing loops when using route reflectors.
References:
1 : What is BGP Route Reflector - Explanation & Discussion (Cisco Example)
2 : BGP Route Reflector - NetworkLessons.com
3 : BGP Route Reflectors (RR) - Cisco Community
4 : Junos OS Routing Protocols Library for Routing Devices
5 : Junos OS Routing Protocols Library for Routing Devices

NEW QUESTION # 92
What are two characteristics of RSTP alternate ports? (Choose two.)

A. RSTP alternate ports are active ports used to forward frames toward the root bridge.
B. RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.
C. RSTP alternate ports provide an alternate higher cost path to the root bridge.
D. RSTP alternate ports provide an alternate lower cost path to the root bridge.

Answer: B,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 # 93
......

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