Design subnets meet the following requirements: • The available IP address space

Question

Design subnets meet the following requirements:
• The available IP address space is the range 10.10.172.0-10.10.172.255. You may only assign IP addresses in this range.
• The LAN connected to router A must be able to support at least 50 hosts.
• The LAN connected to router B must be able to support at least 75 hosts.
• The LAN connected to router C must be able to support at least 20 hosts.

Design the subnets (showing the mask and the first and last addresses in each subnet) using variable length subnet masks. [Assume the address blocks include addresses where the host ids are all zeros and all ones.]

Explanation / Answer

Lan connected to router A: ----------------------------- 10.10.172.0-10.10.172.127 subnet mask is: 255.255.255.128 Lan connected to router B: ----------------------------- 10.10.172.128-10.10.172.191 subnet mask is: 255.255.255.192 Lan connected to router C: ----------------------------- 10.10.172.192-10.10.172.223 subnet mask is: 255.255.255.224 10.10.172.224-10.10.172.255 are available

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