For the network 192.168.100.135/25, what is the network address?

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Multiple Choice

For the network 192.168.100.135/25, what is the network address?

Explanation:
A /25 subnet uses a 255.255.255.128 mask, which creates two equal blocks in the last octet: 0–127 and 128–255. The address 192.168.100.135 falls in the 128–255 block, so the network address is the first address of that block: 192.168.100.128. This subnet runs from 192.168.100.128 to 192.168.100.255, with 192.168.100.255 as its broadcast. That makes 192.168.100.129–192.168.100.254 usable hosts. The other options correspond to the first block’s network (192.168.100.0) or addresses within the subnet (like 192.168.100.129) or the broadcast (192.168.100.255), not the network address for this IP.

A /25 subnet uses a 255.255.255.128 mask, which creates two equal blocks in the last octet: 0–127 and 128–255. The address 192.168.100.135 falls in the 128–255 block, so the network address is the first address of that block: 192.168.100.128. This subnet runs from 192.168.100.128 to 192.168.100.255, with 192.168.100.255 as its broadcast. That makes 192.168.100.129–192.168.100.254 usable hosts. The other options correspond to the first block’s network (192.168.100.0) or addresses within the subnet (like 192.168.100.129) or the broadcast (192.168.100.255), not the network address for this IP.

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