You are a network administrator working for an Internet Service Provider (ISP). The ISP has been allocated the IP address block 203.120.64.0/21. You need to allocate IP addresses to different customer segments, each requiring at least 60 host addresses. How many subnets can you create, and how many usable host addresses are available in each subnet?
Question
You are a network administrator working for an Internet Service Provider (ISP). The ISP has been allocated the IP address block 203.120.64.0/21. You need to allocate IP addresses to different customer segments, each requiring at least 60 host addresses. How many subnets can you create, and how many usable host addresses are available in each subnet?
Solution
The given IP address block 203.120.64.0/21 has a subnet mask of 255.255.248.0. This means there are 21 bits for the network and 11 bits for the hosts.
Step 1: Determine the number of subnets To create subnets that can accommodate at least 60 host addresses, we need to determine how many bits are required for the hosts. Since 2^6 (64) is the smallest power of 2 that is greater than 60, we need 6 bits for the hosts. This leaves us with 5 bits (11 total host bits - 6 host bits) for the subnets. Therefore, we can create 2^5 or 32 subnets.
Step 2: Determine the number of usable host addresses The number of usable host addresses in each subnet is determined by subtracting 2 from the total number of host addresses (the network address and the broadcast address cannot be used). So, with 6 bits for the hosts, we have 2^6 - 2 = 62 usable host addresses in each subnet.
So, you can create 32 subnets, each with 62 usable host addresses.
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