Question 739 of 952 from exam 200-125: Cisco Certified Network Associate Exam

Question 739 of 952 from exam 200-125: Cisco Certified Network Associate Exam

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Question

Refer to the exhibit.

What is the most efficient summarization that R1 can use to advertise its networks to R2?

Answers

Explanations

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A. B. C. D. E.

E

The top two (4.128/25 and 4.0/25) aggregate into 4.0/25, so now we have four /24 networks. if they are aligned right, we can merge these into a /22. If not we'd need to merge them into a /21. The other three subnets are 5.0/24, 6.0/24, 7.0/24.

That means we start at 4.0 and go up to 5.255, i.e. just below 8.0. So this fits neatly into a /22 as these go up in steps of 4 in the 3rd octet. Yes, we can summarise with a /22 that starts at 172.1.4.0, answer D.

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