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Module 3: Network Layer & Routing

20232m

Which one of the following is a valid host for network 192.168.4.32/68?
(i) 192.168.4.39
(ii) 192.168.4.50
(iii) 192.168.4.47
(iv) 192.168.4.31

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Answer: (i) 192.168.4.39

The prefix /68 is not possible for IPv4 (the maximum is /32). The question most likely means 192.168.4.32/28, so that is what is solved here.

For /28: block size = 2^(32−28) = 16 addresses.

  • Network address: 192.168.4.32
  • Broadcast address: 192.168.4.47
  • Valid host range: 192.168.4.33 – 192.168.4.46
Option Address Status
(i) 192.168.4.39 Valid host
(ii) 192.168.4.50 Belongs to the next block (.48–.63)
(iii) 192.168.4.47 Broadcast address, not usable
(iv) 192.168.4.31 Belongs to the previous block (.16–.31)

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