Given the addresses 10.10.16.0/24 and 10.10.23.0/24, which option is the best summary?

The correct answer is D. 10.10.16.0/21. To find the best summary, compare the binary of the third octets: 16 = 00010000 and 23 = 00010111. The first 5 bits (00010) match, giving a /21 prefix (16 network bits + 5 matched bits = 21). The summary 10.10.16.0/21 covers the range 10.10.16.0–10.10.23.255, which includes…

Advanced Addressing and Routing Solutions

Question

Options

A10.10.0.0/16
B10.10.8.0/23
C10.10.16.0/23
D10.10.16.0/21

How the community answered

(21 responses)

A
10% (2)
B
5% (1)
C
14% (3)
D
71% (15)

Explanation

To find the best summary, compare the binary of the third octets: 16 = 00010000 and 23 = 00010111. The first 5 bits (00010) match, giving a /21 prefix (16 network bits + 5 matched bits = 21). The summary 10.10.16.0/21 covers the range 10.10.16.0–10.10.23.255, which includes both networks without encompassing unnecessary address space. 10.10.0.0/16 is too broad, 10.10.8.0/23 does not include both networks, and 10.10.16.0/23 only covers .16.0–.17.255.

Topics

#route summarization#CIDR#IP subnetting#supernet calculation

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