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Exam 300-410 topic 1 question 257 discussion

Actual exam question from Cisco's 300-410

Question #: 257
Topic #: 1

Refer to the exhibit. The network administrator configured the Chicago router to mutually redistribute the LA and NewYork routes with OSPF routes to be summarized as a single route in EIGRP using the longest summary mask: router eigrp 100 redistribute ospf 1 metric 10 10 10 10 10 router ospf 1 redistribute eigrp 100 subnets
!
interface E 0/0
ip summary-address eigrp 100 172.16.0.0 255.255.0.0
After the configuration, the New York router receives all the specific LA routes but the summary route. Which set of configurations resolves the issue on the
Chicago router?

A. router eigrp 100 summary-address 172.16.8.0 255.255.252.0
B. interface E 0/1 ip summary-address eigrp 100 172.16.8.0 255.255.252.0
C. router eigrp 100 summary-address 172.16.0.0 255.255.0.0
D. interface E 0/1 ip summary-address eigrp 100 172.16.0.0 255.255.0.0

Show Suggested Answer

Suggested Answer: B 🗳️

by Remsync at Oct. 28, 2022, 4:26 p.m.

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ChillingAgain

Highly Voted 2 years, 6 months ago

Selected Answer: B

Answer is B. Summarized route for 172.16.8.0/24, 172.16.9.0/24, 172.16.10.0/24, 172.16.11.0/24 is 172.16.8.0/22. Which is noted as 172.16.8.0 255.255.252.0

upvoted 9 times

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inteldarvid

Highly Voted 1 year, 10 months ago

Selected Answer: B

B correct: The advertisement of summary routes occurs on an interface-by-interface basis. For classic EIGRP configuration mode, you use the interface parameter command ip summary-address eigrp as-number network subnet-mask [leak-map route-map-name] to place an EIGRP summary aggregate on an interface.

upvoted 5 times

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[Removed]

Most Recent 10 months ago

Selected Answer: B

B is corerct

upvoted 1 times

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diskman

1 year, 1 month ago

Option B looks closed to be the answer but should be with the network 172.16.4.0 255.255.252.0 (172.16.4.0/22) to summarize the routes generated from New York site.

upvoted 1 times

9410480

1 year ago

I believe 172.16.8.0 is correct, because the question states "New York router receives all the specific LA routes but the summary route", so we are trying to summarize the New York routes, not the LA routes.

upvoted 2 times

9410480

1 year ago

I mean the LA routes, not the New York routes. My bad!

upvoted 1 times

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Pietjeplukgeluk

1 year, 4 months ago

Selected Answer: B

Did not see any references, but the original question states "interface E 0/0" summary need to be created in EIGRP AS that only is activated at "interface E0/1". Also the subnet mask of /16 is to generic, and can be summarized more to specific /22: "172.16.8.0 255.255.252.0"

upvoted 2 times

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Remsync

2 years, 6 months ago

Selected Answer: D

D is the correct answer. Even though both B and D solve the problem, the question is asking for the longest summary mask. D is summarizing with a /16 while B is doing it with a /22. /16 is longer than a /22. Answer D.

upvoted 1 times

diskman

1 year, 1 month ago

Completely inverse as you said, the longer mask means the higher numbers after slash "/" composed of longer length of bits "1" within four octets comprising the mask.

upvoted 1 times

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ChillingAgain

2 years, 6 months ago

Longer prefix means more subnet bits. So /22 is longer than /16. So answer is B

upvoted 11 times

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