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STP Questions 4

November 21st, 2018 in SWITCH 300-115 Go to comments

Question 1

Explanation

The port-priority of all STP ports is 128 so we need to use a lower value (higher priority) so that this port can become root bridge. But this answer is not totally correct (it only the best choice in this question) as the increment of port priority is 32, which means only values 0, 32, 64, 96, 128, 160, 192, and 224 are acceptable. All other values are rejected.

Question 2

Explanation

When Spanning Tree Protocol learns about the network it looks at a Port-Channel interface as a single interface so it will use the port channel for forwarding.

Question 3

Question 4

Explanation

Change to “lower value” means “higher priority” so the secondary link would be preferred over primary link.

Question 5

Question 6

Question 7

Question 8

Question 9

Explanation

There are no “no spanning-tree pvst” or “no spanning-tree mst” commands. They should be “no spanning-tree mode pvst” or “no spanning-tree mode mst” so answer A is the best option left.

Comments
  1. Due_Diligence
    December 16th, 2018

    Q5.

    The second answer (D) given for Q5 is not a valid command. The priority needs to be a numeric value in increments of 4096

    D. DSW1(config)#spanning-tree vlan 10 priority *root*

  2. sdc
    December 19th, 2018

    Q5.

    Another valid syntax for D would be this:

    DSW1(config)#spanning-tree vlan 10 root primary

  3. Anonymous
    January 26th, 2019

    for question 5, how is A correct?

    A priority of 61440 is less than DSW2’s 24576

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