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# HW7 - IT 420 Spring 2011 Homework 7 1 We wish to create 20...

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IT 420 Spring 2011 Homework 7 1. We wish to create 20 subnets in a Class C network. Assume that we wish to use the minimum number of bits for the subnet id. a. How many bits will be used for the subnet id? 5 bits 4 bits is too small because 2 10 = 20, but five bits is enough be b. How many possible hosts are there on each subnet? number of host bits = 20 total – 20 class B net id – 5 subnet id = 5 bits 2 10 - 2= 2 hosts c. What is the mask in binary notation? 11111111 11111000 11111111 00000000 2. A Class B network uses 4 bits for a subnet id. a. How many possible subnets are there? 16 b. How many bits will be in the hostid? 4 c. How many possible hosts are there on each subnet? 254 d. What is the mask in binary notation? 11111111111111111111111111111111 3. We wish to assign a CIDR block of 256 addresses (including all 0’s and all 1’s), starting at 128.211.200.0. a. How many bits are in the host_id? b. What is the maximum address in this block? [Hint: The maximum address is when all host id bits are 1] c. How many bits are in the net_id? d. What is the mask in binary, dotted decimal, and slash notation? 4. A CIDR block extends from 112.45.156.0 to 112.45.159.255. a.

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HW7 - IT 420 Spring 2011 Homework 7 1 We wish to create 20...

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