CCNP 350-401 ENCOR Question 29 DISCUSSION

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  • 2023-06-20
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    Refer to the exhibit. Link1 is a copper connection and Link2 is a fiber connection. The fiber port must be the primary port for all forwarding. The output of the show spanning-tree command on SW2 shows that the fiber port is blocked by spanning tree. An engineer enters the spanning-tree port-priority 32 command on G0/1 on SW2, but the port remains blocked. 

    Q29

    Which command should be entered on the ports that are connected to Link2 to resolve the issue?

    A. Enter spanning-tree port-priority 4 on SW2.
    B. Enter spanning-tree port-priority 32 on SW1.
    C. Enter spanning-tree port-priority 224 on SW1.
    D. Enter spanning-tree port-priority 64 on SW2.

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    Refer to the exhibit. Link1 is a copper connection and Link2 is a fiber connection. The fiber port must be the primary port for all forwarding. The output of the show spanning-tree command on SW2 shows that the fiber port is blocked by spanning tree. An engineer enters the spanning-tree port-priority 32 command on G0/1 on SW2, but the port remains blocked. 

    Q29

    Which command should be entered on the ports that are connected to Link2 to resolve the issue?

    A. Enter spanning-tree port-priority 4 on SW2.
    B. Enter spanning-tree port-priority 32 on SW1.
    C. Enter spanning-tree port-priority 224 on SW1.
    D. Enter spanning-tree port-priority 64 on SW2.

    Correct Answer: B

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    1 Comments

    test2024

    To influence the root port election on SW2, we need to adjust the port priority on the upstream switch (SW1,) local port priority values on SW2 don't matter. The lower the port priority value, the higher the priority. By default, the port priority is 128, with valid values ranging between 0, and 240 in increments of 32. When multiple paths to the root bridge have the same cost, the port priority is the tiebreaker. In this scenario, we want SW2 to use interface Gi 0/1 as its root port and interface Gi 0/0 as its alternate port. To achieve this, we must configure the port priority of Gi 0/1 on SW1 to 32, which is lower than the default priority of '128' on Gi 0/0. By doing so, interface Gi 0/1 on SW1 will advertise BPDUs with a higher priority than those advertised from interface Gi 0/0. SW2 will thus receive the higher priority BPDUs on link 2, choosing Gi 0/1 as its root port.

    2024-10-20 09:36:36
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