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Juniper JN0-351 Exam - Topic 3 Question 38 Discussion

Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)
C) Layer 2 control traffic is permitted on the secondary link. and D) If the active link fails, then the secondary link automatically takes over.
A) Redundant trunk groups use spanning tree to provide loop-free redundant uplinks.
B) Redundant trunk groups load balance traffic across two designated uplink interfaces.

Juniper JN0-351 Exam - Topic 3 Question 38 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 38
Topic #: 3
[All JN0-351 Questions]

Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

Show Suggested Answer Hide Answer
Suggested Answer: C, D

Cis correct because Layer 2 control traffic is permitted on the secondary link of a redundant trunk group (RTG) on EX Series switches.Layer 2 control traffic includes protocols such as LLDP, LACP, and STP, which are used to exchange information and coordinate actions between switches1.According to the Juniper Networks documentation2, Layer 2 control traffic is allowed to pass through both the active and the secondary links of an RTG, but data traffic is only forwarded through the active link. This allows the switches to maintain their Layer 2 adjacencies and monitor the link status on both links.

Dis correct because if the active link fails, then the secondary link automatically takes over in an RTG on EX Series switches.An RTG consists of two trunk links: an active or primary link, and a secondary or backup link2. The active link is used to forward data traffic, while the secondary link is in standby mode.If the active link fails or becomes unavailable, the secondary link immediately transitions to a forwarding state and takes over the data traffic without waiting for normal STP convergence2. This provides fast recovery and redundancy for the network.


by Loren at Feb 06, 2025, 10:52 AM

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Lai
7 months ago
Totally agree with D, it's automatic failover!
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Lonny
8 months ago
Wait, are we sure about the spanning tree part in A?
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Basilia
8 months ago
C seems off to me, not sure about that one.
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Reita
8 months ago
I think B is also correct, right?
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Gilberto
8 months ago
A and D are spot on!
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Corinne
9 months ago
I definitely recall that spanning tree is involved, but I can't remember if it applies to redundant trunk groups. I think I might go with B and D.
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Kirk
9 months ago
I’m a bit confused about the control traffic on the secondary link. I thought it was only allowed on the primary link, but I could be wrong.
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Sina
9 months ago
I practiced a similar question, and I feel like option D sounds right since it mentions automatic failover. But what about option C?
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Lucia
9 months ago
I think I remember that redundant trunk groups do load balancing, so maybe option B is correct? But I'm not sure about the spanning tree part.
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Barbra
9 months ago
Hmm, I'm a bit unsure about the layer 2 control traffic part. I'll need to double-check the details on that before selecting my answer.
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Yvonne
9 months ago
I'm feeling pretty confident about this one. Redundant trunk groups use active-standby configuration, not spanning tree, and they automatically fail over if the active link goes down.
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Toshia
9 months ago
I think the key is to focus on the differences between the options. Spanning tree, load balancing, and automatic failover are all important concepts to consider.
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Lashandra
9 months ago
Okay, let's think this through step-by-step. I know redundant trunk groups are used for redundancy, but I'm not sure about the specifics on how they work.
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Melodie
9 months ago
This question seems straightforward, but I want to make sure I understand the key details about redundant trunk groups on EX Series switches.
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Man
1 year ago
Whoa, this question is like a game of Tetris - gotta fit all the pieces together correctly! I'm betting on A and B, but I could be way off. Maybe I should have consulted the Magic 8-Ball before answering.
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Patti
1 year ago
User4: A and B are the correct statements.
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Kanisha
1 year ago
User3: I'm not sure about A, but B sounds right.
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Peggie
1 year ago
User2: Yeah, A and B make sense to me too.
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Moira
1 year ago
User1: I think A and B are correct.
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Thea
1 year ago
Haha, redundant trunk groups, eh? Sounds like a fancy way of saying 'backup plan in case the main plan fails.' Better have a plan B, right? Anyway, I think B and D are the way to go.
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Vince
1 year ago
This is a tricky one. I'm not sure about C, but the other three options sound plausible. Hmm, maybe I should have studied harder for this exam.
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Patti
1 year ago
User 2: Yeah, and B makes sense too, having a backup link is important.
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Elenor
1 year ago
User 1: I think A is correct, it helps balance the traffic.
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Latricia
1 year ago
I'm not sure about C and D. Can someone explain why they are not correct?
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Miles
1 year ago
I'd go with A and B. Load-balancing across the uplink interfaces and automatic failover on link failure are critical for redundancy.
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Izetta
1 year ago
I agree with Desmond. A and B make sense because they ensure traffic balance and failover.
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Lavonna
1 year ago
B and D seem to be the correct options here. The secondary link should take over if the active link fails, and the redundant trunk group should be connected to the same aggregation switch.
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Magda
1 year ago
Definitely, having redundant trunk groups can help ensure network reliability.
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Kallie
1 year ago
That makes sense. It's important for redundancy and failover.
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Marshall
1 year ago
I agree, and I think D is also correct because redundant trunk groups must be connected to the same aggregation switch.
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Selma
1 year ago
I think B is correct because the secondary link should take over if the active link fails.
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Desmond
1 year ago
I think the correct statements are A and B.
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