Which two commands ensure that DSW1 becomes the root bridge for VLAN 10 and 20?

Refer to the exhibit. Which two commands ensure that DSW1 becomes the root bridge for VLAN 10 and 20? (Choose two.)
A. spanning-tree mstp 1 priority 0
B. spanning-tree mst 1 root primary
C. spanning-tree mst vlan 10,20 priority root
D. spanning-tree mst 1 priority 4096
E. spanning-tree mst 1 priority 1
F. spanning-tree mstp vlan 10,20 root primary

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4 thoughts on “Which two commands ensure that DSW1 becomes the root bridge for VLAN 10 and 20?

  1. Why is it the answer is B&D and not A&B?

    Isn’t it that the lowest priority which is zero is still the best priority value and will make the DSW1 definitely be the root bridge for vlan 10 and 20???

  2. Why is it the answer is B&D and not A&B?

    Isn’t that the lowest priority which is zero is still the best priority value and will make the DSW1 definitely be the root bridge for vlan 10 and 20???

    1. No

      The lower the priority the more likely the switch is to be come the root bridge. However you normally have to do STP in increments of 4096 so you would not be able to allocate a priority of 1 to a switch.

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