200-101 Rstp Practice Questions
The free 200-101: Interconnecting Cisco Networking Devices Part 2 (ICND2) questions that deal with rstp, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #6
Refer to the exhibit. At the end of an RSTP election process, which access layer switch port will assume the discarding role?

Correct answer: C
Explanation
Only the access layer switches (Switch3 and Switch4) matter. Switch3 has a lower bridge ID than Switch4 (lower MAC), so both Switch3 ports forward and the alternate (discarding) port is on Switch4. Switch4 chooses its root port from the superior BPDU: same root ID, same cost and same sender bridge ID, so the sender port ID decides. Fa0/1 (128.1) is lower than Fa0/12 (128.12), so the port connected to Fa0/1 (Switch4 Fa0/2) becomes the root port and Switch4 Fa0/11 becomes the alternate port in discarding state.
Question #7
Which three statements about RSTP are true? (Choose three.)
Select 3 answers.
Correct answer: A, B, D
Explanation
RSTP converges much faster after a link failure, adds the alternate and backup port roles, and moves point-to-point links to forwarding quickly via proposal-agreement rather than STP timers. RSTP port states are discarding, learning and forwarding only.
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