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Question 23 - JN0-351 discussion

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What are two characteristics of RSTP alternate ports? (Choose two.)

A.
RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.
Answers
A.
RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.
B.
RSTP alternate ports provide an alternate lower cost path to the root bridge.
Answers
B.
RSTP alternate ports provide an alternate lower cost path to the root bridge.
C.
RSTP alternate ports provide an alternate higher cost path to the root bridge.
Answers
C.
RSTP alternate ports provide an alternate higher cost path to the root bridge.
D.
RSTP alternate ports are active ports used to forward frames toward the root bridge.
Answers
D.
RSTP alternate ports are active ports used to forward frames toward the root bridge.
Suggested answer: A, C

Explanation:

Ais correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port1.However, an alternate port does not forward any traffic, as it is in a discarding state2. It only listens to BPDUs and waits for the root port to fail.If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port1.

Cis correct because RSTP alternate ports provide an alternate higher cost path to the root bridge.An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID3.However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself1. Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.

asked 18/09/2024
Karoy Bandi
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