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Juniper JN0-351 Exam - Topic 9 Question 49 Discussion

Which two statements correctly describe RSTP port roles? (Choose two.)
A) The designated port forwards data to the downstream network segment or device. and D) The root port is responsible for forwarding data to the root bridge.
B) The backup port is used as a backup for the root port.
C) The alternate port is a standby port for an edge port.

Juniper JN0-351 Exam - Topic 9 Question 49 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 49
Topic #: 9
[All JN0-351 Questions]

Which two statements correctly describe RSTP port roles? (Choose two.)

Show Suggested Answer Hide Answer
Suggested Answer: A, D

In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree1.

Option A suggests that the designated port forwards data to the downstream network segment or device.This is correct because the designated port is the port on a network segment that has the best path to the root bridge1.It's responsible for forwarding frames towards the root bridge and sending configuration messages into its segment1.

Option D suggests that the root port is responsible for forwarding data to the root bridge.This is also correct because the root port is always the link directly connected to the root bridge, or the shortest path to the root bridge1.It's used to forward traffic towards the root bridge1.

Therefore, options A and D are correct.


by Jaime at Nov 19, 2025, 10:51 PM

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Fannie
3 months ago
Same here! A and D are clear choices.
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Isabelle
3 months ago
I feel confident about A and D. They fit the definitions.
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Adela
3 months ago
B is misleading. Backup is not for the root port.
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Stephania
4 months ago
I thought the alternate port was for the root port, not edge.
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Tesha
4 months ago
Wait, isn't the backup port for the designated port, not the root?
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Mila
4 months ago
D is definitely right, root port forwards to the root bridge.
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Crista
5 months ago
A is correct, designated port does forward data.
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Dorothy
5 months ago
Wow, this question is a real brainteaser! I'm going to go with B and D - the backup port and the root port. Gotta love these RSTP questions!
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Kathrine
5 months ago
This is easy, the answer is A and D. The designated port forwards and the root port is the one that connects to the root bridge.
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Jennie
5 months ago
Haha, I thought the alternate port was for when your cat walks across the keyboard! But seriously, I think A and D are the right choices.
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Taryn
5 months ago
I'm pretty sure B and D are the right answers. The backup port is a backup for the root port, and the root port forwards to the root bridge.
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Hollis
5 months ago
A and D are correct. The designated port forwards data and the root port is responsible for forwarding to the root bridge.
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Paulene
6 months ago
I feel like the backup port is just a safety measure for the root port, but I can't recall if that's correct.
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Jordan
6 months ago
I’m a bit confused about the alternate port; I thought it was more related to the root port rather than an edge port.
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Keith
6 months ago
I remember practicing a question similar to this, and I think the root port is definitely responsible for forwarding data to the root bridge.
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Johnetta
6 months ago
I think the designated port does forward data, but I'm not sure about the backup port's role.
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Francis
6 months ago
I remember learning about these port roles, but I'm drawing a blank on the specifics right now. I'll have to rely on the process of elimination and my general understanding of spanning tree protocol.
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Rolande
6 months ago
I'm pretty confident about A and D. The designated port and root port roles seem straightforward. I'm a little unsure about the backup and alternate ports, but I'll make an educated guess.
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Becky
7 months ago
Okay, let me think this through. The designated port makes sense, and the root port is the one that connects to the root bridge. I'm not as sure about B and C, but I'll give it my best shot.
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Lenna
7 months ago
What about B? Isn't the backup port important?
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Remona
7 months ago
I think A and D are correct. Makes sense!
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Hui
7 months ago
Totally agree with A and D, they make sense!
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Arminda
7 months ago
I agree, A is definitely right. D too, it's the root port's job.
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Glynda
8 months ago
I'm a bit confused on the difference between the backup port and the alternate port. I'll have to review those definitions more carefully.
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Roslyn
8 months ago
I think A and D are the correct answers, since the designated port forwards data and the root port is responsible for forwarding to the root bridge.
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Jutta
2 months ago
Good points! Those roles are key in RSTP.
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Tabetha
2 months ago
I think A and D are spot on!
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Rhea
3 months ago
D is crucial for the root bridge connection.
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Matt
3 months ago
Definitely! A is clear about forwarding.
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Jenelle
3 months ago
I agree, A and D make sense.
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