Which summary IP address is most efficient?

Posted by: Pdfprep Category: 200-310 Tags: , ,

Refer to the exhibit.

To optimize routing table size, a design engineer must create the summarization for subnets in their central office.

Which summary IP address is most efficient?
A . 10.20.0.0/15
B . 10.21.0.0/17
C . 10.21.128.0/17
D . 10.21.0.0/16

Answer: B

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