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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

BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.

Topic 3

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 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

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 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.

Topic 7

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.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q15-Q20):

NEW QUESTION # 15
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: B

Explanation:
The "Root ID" shows 4096.00:19:e2:55:36:1e. The first part of this ID, 4096, is the bridge priority of the root bridge.
The local bridge ID is shown as 32768.00:19:e2:55:1d:30, indicating that the local device has a default bridge priority of 32768, which is higher (and thus less preferred) than 4096.
Thus, the root bridge has a priority of 4096, and the local device is not the root bridge. The local device is participating in the RSTP topology and has identified another bridge as the root.

NEW QUESTION # 16
Based on the traceoptions output shown in the exhibit, what is the problem with the adjacency?

A. authentication mismatch
B. connectivity
C. MTU mismatch
D. area mismatch

Answer: D

NEW QUESTION # 17
You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?

A. The max-age must be increased to 20
B. The hello-time must be increased.
C. The force-version must be removed.
D. The bridge priority for EX-4 must be set at 4000.

Answer: C

Explanation:
The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp.
This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP. This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence. The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches. Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says "Warning:
STP version mismatch with neighbor" when it receives a BPDU from a RSTP neighbor.
To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force-version command in configuration mode.

NEW QUESTION # 18
What are two characteristics of RSTP alternate ports? (Choose two.)

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

Answer: A,D

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 # 19
Which two statements correctly describe RSTP port roles? (Choose two.)

A. The root port is responsible for forwarding data to the root bridge.
B. The designated port forwards data to the downstream network segment or device.
C. The backup port is used as a backup for the root port.
D. The alternate port is a standby port for an edge port.

Answer: A,B

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 # 20
......

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Ray Martin Ray Martin

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