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Router R2 is advertising prefix 192.168.1.0/27 with community "no-advertise" towards AS 65002.
Which routers receive an update for that prefix?
Suggested Answer: B
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39 comments · newest first
WI
Willodean
11 months ago
Just to clarify, R2 won't advertise anything with that community tag.
SH
Shenika
11 months ago
I agree, D makes the most sense here.
CA
Carylon
11 months ago
Wait, are you sure? I thought it would still send to R3.
NO
Nobuko
11 months ago
Definitely D, no updates go out!
CA
Candra
12 months ago
R2 is using "no-advertise" for 192.168.1.0/27.
GE
Genevieve
12 months ago
I vaguely recall that "no-advertise" prevents advertising to other ASes, so I’m leaning towards D as well.
VA
Valentine
1 year ago
I’m not entirely sure, but I feel like R3 might still receive it since it’s directly connected. Maybe it’s A?
RE
Reynalda
1 year ago
I remember a practice question where a similar community was used, and it restricted updates. Could it be that R2 doesn't advertise it at all?
LY
Lynda
1 year ago
I think the "no-advertise" community means that the prefix won't be sent to any other AS, so maybe it's D?
VI
Vinnie
1 year ago
This is a good test of understanding BGP communities. I'll carefully review the behavior of the "no-advertise" community and make sure I understand how it affects route propagation before selecting my answer.
WI
Wilda
1 year ago
Okay, I think I've got it. The "no-advertise" community will prevent the prefix from being advertised to any other AS, so the only router that should receive the update is R2 itself. The answer is D.
VI
Vilma
1 year ago
I'm a bit confused on this one. The "no-advertise" community is supposed to prevent the route from being advertised, but the question asks who receives the update. I'll need to double-check the BGP behavior here.
RO
Rosendo
1 year ago
The question is pretty straightforward. The "no-advertise" community should prevent the prefix from being advertised to any other AS, so the answer is D.
SO
Soledad
1 year ago
Hmm, this looks like a tricky one. I'll need to carefully consider the BGP community "no-advertise" and how that affects the route propagation.
GA
Gaston
1 year ago
Ah, I see the issue now. The problem is that Service A is using the wrong keys to encrypt and sign the message for Service B. The solution is to use a shared session key between the two services, which will provide both confidentiality and authentication. I'll make sure to remember this pattern for the exam.
EL
Elliot
1 year ago
You know, if R2 really wanted to keep that prefix a secret, they should have just used the 'no-tweet' community instead.
TH
Thaddeus
1 year ago
R5 does not receive an update for that prefix.
IR
Ira
1 year ago
R2 should have been more careful with the community.
CA
Carmela
1 year ago
R3 and R4 receive an update for that prefix.
NO
Noelia
1 year ago
R2 should have used 'no-tweet' instead.
JA
Jacki
1 year ago
Ah, the 'no-advertise' community - it's like the router is saying 'shhh, this prefix is a secret!' D is the only logical choice.
RO
Rosalyn
1 year ago
So, only Router R2 does not advertise an update for the prefix.
VI
Vincenza
1 year ago
Yeah, Router R2 is not advertising the prefix with the 'no-advertise' community.
JA
Jacki
1 year ago
I think D is the correct answer.
DO
Dorinda
1 year ago
I'm guessing the 'no-advertise' community is the key here. If R2 doesn't share the prefix, then no other routers will receive the update. D is my pick.
LU
Luz
1 year ago
Exactly, the 'no-advertise' community prevents the prefix from being shared further.
JU
Julianna
1 year ago
So, the answer is D, Router R2 does not advertise an update for the prefix.
PU
Pura
1 year ago
I think you're right. If R2 is not advertising the prefix, then no other routers will receive the update.
GO
Goldie
2 years ago
Hmm, 'no-advertise' means the prefix won't be shared with anyone, so it has to be D. Tricky question, though!
GE
Gerald
1 year ago
Good catch on the 'no-advertise' community, D is the right choice.
AL
Aleshia
1 year ago
I agree, D is the correct answer here.
LI
Lisandra
1 year ago
Yeah, that's a sneaky one. Definitely D.
MA
Mariko
1 year ago
Yeah, it's definitely a tricky question, but D makes the most sense in this case.
JA
Janine
1 year ago
I think you're right, 'no-advertise' means the prefix won't be shared with anyone, so it has to be D.
CA
Candida
1 year ago
I think it's D too. 'No-advertise' means it won't be shared.
HE
Herminia
2 years ago
Wait, 'no-advertise' community? Isn't that like putting a 'do not read' sign on the prefix? D has to be the answer here.
XU
Xuan
2 years ago
I'm not sure about this one. Can someone explain why R5 is not included in the update?
KR
Kris
2 years ago
I agree with Delila. Router R2 is using the 'no-advertise' community, so only R3 and R4 will receive the update.
DE
Delila
2 years ago
I think the answer is B) Routers R3 and R4 only.