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Nokia 4A0-115 Exam - Topic 6 Question 21 Discussion

Which of the following statements about multi-homing for a Layer-2 service is TRUE?
C) In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
A) In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
B) In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
D) The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.

Nokia 4A0-115 Exam - Topic 6 Question 21 Discussion

Actual exam question for Nokia's 4A0-115 exam
Question #: 21
Topic #: 6
[All 4A0-115 Questions]

Which of the following statements about multi-homing for a Layer-2 service is TRUE?

Show Suggested Answer Hide Answer
Suggested Answer: C

PE2 advertises a MAC/IP route for MAC1 with a sequence number higher than that received from PE1. This indicates that MAC1 has moved from PE1 to PE2 and triggers a MAC withdrawal message from PE1 to remote PEs.CE1 does not generate an update message to PE1 withdrawing its MAC, nor does PE1 generate an update message to remote PEs identifying the new location of CE11.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)


by Daren at May 17, 2024, 09:13 AM

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Bernardo
8 months ago
B is definitely wrong, traffic flow is different in single-active mode.
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Ettie
8 months ago
Wait, really? Only two PEs for multi-homing? That’s surprising!
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Kiera
8 months ago
D seems off, I thought Nokia 7750 could handle more than two.
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Jeniffer
8 months ago
I thought C was true too, all-active sounds right!
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Ashlyn
9 months ago
A is correct, single-active mode needs LAG.
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Tora
9 months ago
I don't think option D is right; I recall the Nokia 7750 SR can support more than two PEs for multi-homing, but I need to double-check that.
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Rosalind
9 months ago
I feel like option C is correct because in all-active mode, all PEs should be able to handle traffic, but I can't recall the specifics.
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Valentine
9 months ago
I remember practicing a question about single-active mode, and I think it was mentioned that the CE only forwards to one PE, which makes me lean towards option B.
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Ezekiel
9 months ago
I think option A sounds familiar, but I'm not entirely sure if LAG is always required in single-active mode.
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Nancey
9 months ago
I feel pretty confident about this one. The all-active mode description sounds right to me, and I don't see any issues with the other options. I'll go with C as my final answer.
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Ruby
9 months ago
Wait, I'm a bit confused. Is the Nokia 7750 SR detail relevant here or just a distractor? I'll need to make sure I understand how that fits in with the other information provided.
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Cary
9 months ago
Okay, I think I've got a handle on this. The key is understanding the behavior of the CE in each mode - in single-active it forwards to all PEs but receives from only one, while in all-active it can forward and receive from all attached PEs.
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Marion
9 months ago
Hmm, this looks like a tricky question about multi-homing for Layer-2 services. I'll need to carefully read through the options and think about the key differences between single-active and all-active modes.
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Selma
10 months ago
I've got a good strategy for this. I'll first eliminate any options that are clearly incorrect, then carefully compare the remaining options to identify the one that is definitively true based on the information given.
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Pamela
10 months ago
Option B makes a lot of sense to me. The economic waste is a major issue that likely has a big impact on care quality.
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Aileen
10 months ago
I'm not sure if UDP or TCP is the better protocol here. I'll have to weigh the pros and cons of each.
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Donte
10 months ago
Okay, let's see... I think the key here is routing calls to an unknown domain, so it's probably not a SIP trunk or neighbor zone. I'm leaning towards B or C.
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Deandrea
1 year ago
I bet the correct answer is hidden somewhere in the fine print. Probably needs a magnifying glass to find it.
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Craig
1 year ago
C) In the all-active mode, all PEs attached to a CE can forward traffic to and from the CE.
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Jade
1 year ago
B) In the single-active mode, the CE forwards traffic to all attached PEs and receives traffic from a single PE.
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Xuan
1 year ago
C) In the all-active mode, all PEs attached to a CE can forward traffic to and from the CE.
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Freeman
1 year ago
B) In the single-active mode, the CE forwards traffic to all attached PEs and receives traffic from a single PE.
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Lettie
1 year ago
A) In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
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Ilona
1 year ago
A) In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
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Cecil
1 year ago
D has to be the right choice. The Nokia 7750 SR supports multi-homing to a maximum of two PEs, so that's the true statement.
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Roselle
1 year ago
No, in the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
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Lottie
1 year ago
So, in the single-active mode, the CE forwards traffic to all attached PEs and receives traffic from a single PE, right?
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Kerry
1 year ago
That's true, D is the right choice for this question.
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Josefa
1 year ago
I think D is correct, the Nokia 7750 SR does support multi-homing to a maximum of two PEs.
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Carli
1 year ago
Hmm, I'm not sure about the correct answer. Maybe I should have paid more attention in my Layer-2 networking class.
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Edward
1 year ago
I think B is the right answer. The CE forwards traffic to all attached PEs but receives from a single PE in the single-active mode.
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Telma
1 year ago
Yes, that's correct. In the all-active mode, all PEs attached to a CE can forward traffic to and from the CE.
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Hannah
1 year ago
I agree, B is correct. The CE forwards traffic to all attached PEs but receives from a single PE in single-active mode.
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Junita
1 year ago
But in the all-active mode, all PEs can forward traffic, not just one.
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Jettie
1 year ago
Option C seems correct to me. In the all-active mode, all PEs attached to a CE can forward traffic in both directions.
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Crissy
1 year ago
That's correct. It's a different setup compared to the all-active mode.
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An
1 year ago
So, in the single-active mode, the CE only forwards traffic to one PE?
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Nobuko
1 year ago
Yes, that's right. It allows for better redundancy and load balancing.
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Son
1 year ago
I think option C is correct. All PEs can forward traffic in the all-active mode.
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Vincent
1 year ago
I disagree, I believe the answer is A.
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Junita
1 year ago
I think the answer is C.
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