Switch 2 is primary. But in this context, that is to say when it fails, the primary is chosen between SW1, SW3 and SW4. Thus, SW3 becomes the root.
Answer C is correct.
Spanning-Tree Selection Order
The spanning-tree algorithm uses the following criteria in order to determine the root bridge and port roles:
1 Bridge Priority (lowest)
2 Path Cost (which is based on link bandwidth)
3 Port Priority
4 Port ID (as a tiebreaker)
The wording for this question is important (if the primary switch fails).
The bridge priority takes precedence over the MAC address.
Switch 2 is the primary switch (it has the lowest number bridge priority).
Switch 3 would be the backup (it has the second lowest number bridge priority).
Answer is C.
It's C. The bridge priority takes precedence over the MAC address. It's only used as a tie-breaker in the case that priorities are equal.
This should not be so contentious.
To answer this question, we first have to identify which switch is the root of the network, based on the information in the image, the switch with the smallest BRID becomes the root, in this case SW2, since it is the root at the moment If it fails, there will be a new election following the same criteria, so SW3 becomes the root of the network.
The correct answer is C, SW3.
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