Refer to the topology.
If Sw-E is the root for all VLANs, which of the following is a valid path from host A to Server
1?
A.
Sw-A, Sw-D
B.
Sw-A, Sw-E, Sw-D
C.
Sw-A, Sw-B, Sw-C, Sw-D
D.
Sw-A, Sw-E, Sw-C, Sw-D
E.
Sw-A, Sw-E, Sw-A, Svv-D
Explanation:
All the traffic must go through root switch so the shortest path should be Sw-A -> Sw-E -> Sw-C ->
Sw-D (notice that traffic can not go through Sw-A -> Sw-E and back to Sw-A again)
Explanation is wrong. Traffic does NOT have to go through the root bridge. It all depends on which ports are forwarding and which are discarding. There is not enough data to decide which ports would be blocked. So A or D could be the answer since SW-D could block either D-A link or D-C link. They are absolutely identical from SW-D standpoint.
So if Sw-C has lower bridge ID than Sw-A the answer would be D оtherwise A.
Even “C” could be the right answer if path E->C->B->A cost is lower than EA and ECDA path cost. But it is very improbable assumption.