Which of the following statements about spanning-tree port states are true? (Choose two.)

Question

Exhibit

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.

• A
  87% (46)
• C
  2% (1)
• D
  4% (2)
• E
  8% (4)

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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