What is the broadcast address for the 10.0.0.0/24 subnet?

• A. 10.0.0.255
• B. 10.0.0.0
• C. 10.0.1.0
• D. 10.255.255.255

Answer: (A)

Broadcast addresses are formed by turning all host bits within a subnet to 1. For a /24 subnet, the mask is 255.255.255.0, so the first three octets identify the network and the last octet is the host portion. Setting the host part to 11111111 gives 10.0.0.255, which is the address used to reach every device in the 10.0.0.0/24 network. The network address 10.0.0.0 identifies the subnet itself and isn’t used to reach hosts. 10.0.1.0 would belong to a different /24, and 10.255.255.255 is not the broadcast for this subnet. So the broadcast address for 10.0.0.0/24 is 10.0.0.255.