Which address and subnet combination is valid for a host assignment?

Question

Options

• A172.23.175.210/15
• B10.100.74.127/25
• C192.168.73.223/29
• D10.230.33.15/28

• A
  75% (27)
• B
  6% (2)
• C
  14% (5)
• D
  6% (2)

Explanation

A valid host address must not be the network address (all host bits = 0) or the broadcast address (all host bits = 1).

• A. 172.23.175.210/15: Mask = 255.254.0.0. Network = 172.22.0.0, Broadcast = 172.23.255.255. The address 172.23.175.210 falls well within the usable host range. VALID
• B. 10.100.74.127/25: Mask = 255.255.255.128. Network = 10.100.74.0, Broadcast = 10.100.74.127. The address .127 IS the broadcast address. INVALID
• C. 192.168.73.223/29: Mask = 255.255.255.248. Subnets increment by 8. The subnet containing .223 is 192.168.73.216/29, with broadcast = 192.168.73.223. The address .223 IS the broadcast address. INVALID
• D. 10.230.33.15/28: Mask = 255.255.255.240. Subnets increment by 16. The subnet 10.230.33.0/28 has broadcast = 10.230.33.15. The address .15 IS the broadcast address. INVALID

Only option A assigns an address that is neither the network ID nor the broadcast address.

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