200-101 · Question #228
200-101 Question #228: Real Exam Question with Answer & Explanation
The correct answer is A: A port in the blocking state does not forward frames.. In IEEE 802.1D STP, each port state has defined behaviors regarding BPDUs and frame forwarding. A is correct: a blocking port receives BPDUs but does not forward data frames or learn MAC addresses. B is correct: a listening port sends and receives BPDUs but does not forward data
Question
Options
- AA port in the blocking state does not forward frames.
- BA port in the listening state receives and processes BPDUs but does not forward frames.
- CA port in the learning state receives and processes BPDUs but does not forward frames.
- DA port in the forwarding state receives and processes BPDUs and forwards frames.
- EA port in the disabled state receives and processes BPDUs but does not forward frames.
Explanation
In IEEE 802.1D STP, each port state has defined behaviors regarding BPDUs and frame forwarding. A is correct: a blocking port receives BPDUs but does not forward data frames or learn MAC addresses. B is correct: a listening port sends and receives BPDUs but does not forward data frames and does not learn MAC addresses. C is technically accurate as well (a learning port does process BPDUs without forwarding frames), but the exam distinguishes it by the fact that learning ports also populate the MAC address table - a key differentiator the listed statement omits. D is false as stated because a forwarding port does both process BPDUs AND forward frames, making 'but does not forward frames' incorrect. E is false: a disabled port is administratively shut down and does not participate in STP at all - it neither receives nor processes BPDUs.
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