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Exam 300-410 topic 1 question 29 discussion

Actual exam question from Cisco's 300-410
Question #: 29
Topic #: 1
[All 300-410 Questions]


Refer to the exhibit. The network administrator has configured the Customer Edge router (AS 64511) to send only summarized routes toward ISP-1 (AS 100) and
ISP-2 (AS 200).

After this configuration, ISP-1 and ISP-2 continue to receive the specific routes and the summary route.
Which configuration resolves the issue?
A.

B.

C.

D.

Show Suggested Answer Hide Answer
Suggested Answer: A
by youarewrong at July 16, 2021, 11:06 p.m.

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timtgh
Highly Voted 2 years, 9 months ago
The aggregate-address command causes a router to send a summary route AND still also send the normal individual routes - unless you add "summary-only." So A is correct.
upvoted 5 times
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[Removed]
Most Recent 7 months, 3 weeks ago
A is correct
upvoted 1 times
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Huntkey
2 years, 6 months ago
A is correct
upvoted 2 times
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Dataset
2 years, 7 months ago
Correct A
upvoted 2 times
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AliMo123
3 years, 7 months ago
A is the correct answer but let me clarify this: aggregate address is similar to route summary addresses like a router prefers to receive a single route instead of too many. notice here 172.16.20.0 255.255.252.0 covers from 172.16.21.0 to 172.16.23.0 so aggregate-add 172.16.20.0 255.255.252.0 summary only will force these addresses to send only summary to AS 100 and 200 to fulfill the request
upvoted 4 times
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[Removed]
3 years, 7 months ago
The given answer is correct
upvoted 1 times
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youarewrong
3 years, 7 months ago
Set this up to verify. Answer 'A' does indeed summarize on ISP-1 and 2.
upvoted 1 times
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C (25%)
B (20%)
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