What is the network ID and subnet mask of 172.16.10.22/30?

To find the network ID and subnet mask for the IP address 172.16.10.22/30, we need to understand what a /30 subnet means.

A /30 subnet means that there are 30 bits in the network portion of the IP address, leaving 2 bits for host addresses. This results in a subnet mask of 255.255.255.252.

Now, let’s calculate the network ID:

1. Convert the IP address and subnet mask to binary.
   • IP address: 172.16.10.22 -> 10101100.00010000.00001010.00010110
   • Subnet mask: 255.255.255.252 -> 11111111.11111111.11111111.11111100
2. Perform a bitwise AND operation between the IP address and the subnet mask to find the network ID.
   • IP address: 10101100.00010000.00001010.00010110
   • Subnet mask: 11111111.11111111.11111111.11111100
   • Network ID: 10101100.00010000.00001010.00010100 (172.16.10.20)

So, the correct answer is:

• Network ID: 172.16.10.20
• Subnet mask: 255.255.255.252

Therefore, the correct option is: 172.16.10.20 and 255.255.255.252