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

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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 because 25 – 2 = 30 b. How many possible hosts are there on each subnet? # of host bits = 32 total – 24 class B net id – 5 subnet id = 3 bits 23 - 2= 8 hosts c. What is the mask in binary notation? 11111111 11111111 11111111 11111000 2. A Class B network uses 4 bits for a subnet id. a. How many possible subnets are there? 24 – 2 = 14 b. How many bits will be in the hostid? Number of host bits = 32 total – 16 class C net id – 4 subnet id = 12 bits c. How many possible hosts are there on each subnet? 2^12 – 2 = 4094 d. What is the mask in binary notation? 11111111 11111111 11110000 00000000 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? 256 address= 2^8, 8 bits b. What is the maximum address in this block? [Hint: The maximum address is when all host id bits are 1] 10000000 11010011 11001000 00000000 + 11111111 10000000 11010011 11001000 11111111 128.211.200.255 is the maximum address c. How many bits are in the net_id? 32 bits – 8 bits (host id ) 24bits = net id d. What is the mask in binary, dotted decimal, and slash notation? 11111111 11111111 11111115 00000000

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## This note was uploaded on 03/28/2012 for the course IT 420, 245 taught by Professor Kattering during the Spring '12 term at NJIT.

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

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