Refer to the exhibit. Which address range efficiently summarizes the routing table of the addresses for router Main?
 

A. 172.16.0.0./21

B. 172.16.0.0./20

C. 172.16.0.0./16

D. 172.16.0.0/18








 

Suggested Answer: B

The 172.16.0.0./20 network is the best option as it includes all networks from 172.16.0.0 - 172.16.16.0 and does it more efficiently than the /16 and /18 subnets.
The /21 subnet will not include all the other subnets in this one single summarized address.

This question is in CCNA 200-125 exam 
For getting CCNA Certificate


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