Refer to the exhibit. What are the possible port roles for ports A, B, C, and D in this RSTP-enabled network?

Question:
Refer to the exhibit. What are the possible port roles for ports A, B, C, and D in this RSTP-enabled network?

• alternate, designated, root, root
• designated, alternate, root, root
• alternate, root, designated, root
• designated, root, alternate, root

Explanation: Because S1 is the root bridge, B is a designated port, and C and D root ports. RSTP supports a new port type, alternate port in discarding state, that can be port A in this scenario.

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