Cisco 200-125 Exam

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
Answer: Option B.
Explanation: 

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.

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