If an IP address is 192.168.5.20 with subnet mask 255.255.255.0, which is the network address?

If an IP address is 192.168.5.20 with subnet mask 255.255.255.0, which is the network address?

• A. 192.168.5.20
• B. 192.168.5.255
• C. 192.168.5.0
• D. 192.168.0.0

Answer: (C)

Subnetting uses a mask to separate the network and host parts of an address. With a 255.255.255.0 mask, the first three octets define the network and the last octet identifies hosts within that network. To find the network address, apply the mask to the IP: 192.168.5.20 AND 255.255.255.0 equals 192.168.5.0. This is the network address for that subnet. The broadcast address for this network would be 192.168.5.255, and 192.168.5.20 is a host address within that network. The other options correspond to either a broadcast (192.168.5.255) or a different network (for example, 192.168.0.0 would be the network for 192.168.0.0/24).

Subnetting uses a mask to separate the network and host parts of an address. With a 255.255.255.0 mask, the first three octets define the network and the last octet identifies hosts within that network. To find the network address, apply the mask to the IP: 192.168.5.20 AND 255.255.255.0 equals 192.168.5.0. This is the network address for that subnet. The broadcast address for this network would be 192.168.5.255, and 192.168.5.20 is a host address within that network. The other options correspond to either a broadcast (192.168.5.255) or a different network (for example, 192.168.0.0 would be the network for 192.168.0.0/24).