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

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

• 172.16.0.0./21
• 172.16.0.0./20
• 172.16.0.0./16
• 172.16.0.0/18

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 anddoes 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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