Final answer:
The network address for the given IP address with a /21 subnet is 155.100.56.0, the broadcast address is 155.100.63.255, and the valid IP range is 155.100.56.1 to 155.100.63.254.
Step-by-step explanation:
The given IP address is 155.100.62.15/21. To determine the network address, we need to find the bitwise AND between the IP address and the subnet mask. For a /21 subnet, the subnet mask is 255.255.248.0. By performing the AND operation, we get the network address 155.100.56.0.
The broadcast address can be obtained by setting all the host bits to 1 in the network address. So, the broadcast address for this subnet would be 155.100.63.255.
To find the valid IP range, we need to exclude the network address and the broadcast address. The first valid IP is obtained by adding 1 to the network address, which is 155.100.56.1. The last valid IP is obtained by subtracting 1 from the broadcast address, which is 155.100.63.254. Therefore, the valid IP range is 155.100.56.1 to 155.100.63.254.