What is the maximum number of subnets that can be created from a Class B network
Practice Questions
Q1
What is the maximum number of subnets that can be created from a Class B network using a /30 subnet mask?
64
128
1024
256
Questions & Step-by-Step Solutions
What is the maximum number of subnets that can be created from a Class B network using a /30 subnet mask?
Step 1: Understand what a Class B network is. A Class B network has a default subnet mask of /16, which means the first 16 bits are used for the network part.
Step 2: Know what a /30 subnet mask means. A /30 subnet mask uses 30 bits for the network part and leaves 2 bits for the host part.
Step 3: Calculate how many bits are borrowed. Since the default Class B mask is /16 and we are using /30, we are borrowing 14 bits (30 - 16 = 14).
Step 4: Use the formula to find the number of subnets. The formula is 2 raised to the number of borrowed bits. So, 2^14 = 16384.
Step 5: Realize that each /30 subnet can only accommodate 2 usable IP addresses (since 2 addresses are reserved for network and broadcast).
Step 6: Conclude that the maximum number of subnets created from a Class B network using a /30 subnet mask is 16384.
