Nokia Exam 4A0-C04 Topic 1 Question 44 Discussion

Actual exam question for Nokia's 4A0-C04 exam

Question #: 44
Topic #: 1

Click the exhibit.

Router R3 is configured with an import policy to reject updates with an AS Path matching the regular expression ".+ 65540". Which of the following regarding updates originating in AS 65540 is TRUE?

ARouter R3 rejects all updates originating in AS 65540.

BRouter R3 accepts updates received from router R1 and rejects updates transited through router R2.

CRouter R3 accepts updates transited through router R2 and rejects updates received from router R1.

DRouter R3 accepts updates from both routers R1 and R2.

Show Suggested Answer

Suggested Answer: C

by Delisa at Aug 08, 2023, 07:12 PM

Limited Time Offer

25%

Off

Get Premium 4A0-C04 Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Nettie

1 months ago

Wait, is this a trick question? If R3 is configured to reject updates with a specific AS Path, shouldn't it just reject everything coming from AS 65540, regardless of the route? I'm going with A, but honestly, I might need to consult a router whisperer for this one.

upvoted 0 times

...

Dottie

1 months ago

Aha, I've got it! B is the correct answer. R3 is looking at the AS Path, not the origin AS, so it'll reject updates from R2 but accept the ones from R1. Easy peasy, just like configuring BGP on a Friday night.

upvoted 0 times

...

Lavonda

1 months ago

This is a tricky one, but I think D is the way to go. R3 is configured to reject updates with a specific AS Path, not the origin AS, so it should accept from both R1 and R2. Routers, the gift that keeps on giving headaches!

upvoted 0 times

Leota

6 days ago

So, even though the updates are originating in AS 65540, as long as they are not transited through R2, R3 should accept them.

upvoted 0 times

...

Wendell

8 days ago

Yeah, that makes sense. R3 is only configured to reject updates based on the AS Path, not the origin AS.

upvoted 0 times

...

Freeman

17 days ago

I agree, I think D is the correct answer. R3 should accept updates from both R1 and R2.

upvoted 0 times

...

2 months ago

Hmm, looks like the correct answer is B. R3 rejects updates with AS Path matching the regex, so it should accept updates from R1 and reject those from R2 since they're transiting through AS 65540.

upvoted 0 times