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Juniper JN0-351 Exam - Topic 6 Question 39 Discussion

What are two characteristics of RSTP alternate ports? (Choose two.)
A) RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. and C) RSTP alternate ports provide an alternate higher cost path to the root bridge.
B) RSTP alternate ports provide an alternate lower cost path to the root bridge.
D) RSTP alternate ports are active ports used to forward frames toward the root bridge.

Juniper JN0-351 Exam - Topic 6 Question 39 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 39
Topic #: 6
[All JN0-351 Questions]

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

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Suggested Answer: A, C

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.


by Stevie at Mar 04, 2025, 04:17 PM

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Tammi
7 months ago
Yup, A is definitely right!
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Adell
8 months ago
I thought alternate ports were just backups, not active.
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Jacklyn
8 months ago
Wait, are you sure about B?
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Ora
8 months ago
Totally agree, A is key for RSTP.
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Sherman
8 months ago
A and B are correct!
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Nicolette
9 months ago
I think alternate ports are meant to provide an alternate path, but I can't remember if it's higher or lower cost. This is tricky!
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Clemencia
9 months ago
I feel like alternate ports are supposed to be active, but I can't recall if they actually forward frames or just stand by.
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Lindsey
9 months ago
I remember something about alternate ports providing a lower cost path to the root bridge, but I might be mixing it up with backup ports.
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Gilbert
9 months ago
I think alternate ports do block traffic when they receive superior BPDUs, but I'm not entirely sure if that's the only characteristic.
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Skye
9 months ago
I remember learning about RSTP alternate ports in class, but I'm drawing a blank on the specifics right now. I'll have to review my notes and try to jog my memory before answering this one.
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Carmen
9 months ago
Okay, let me see. I know the alternate ports are not used to forward frames, so that rules out option D. And I think they block traffic, not forward it, while receiving the superior BPDUs. So I'll go with A and B.
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Quinn
9 months ago
Hmm, I'm a bit confused on this one. I know the alternate ports have something to do with providing a backup path, but I can't remember if it's a higher or lower cost path. I'll have to think this through carefully.
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Erick
9 months ago
I'm pretty sure the RSTP alternate ports block traffic while receiving superior BPDUs, and they provide an alternate lower cost path to the root bridge. I feel confident about those two characteristics.
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