HW7Solution

# HW7Solution - IT 120 Spring 2010 Homework 7 Solutions 1 We...

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IT 120 Spring 2010 Homework 7 Solutions 1. We wish to assign a CIDR block of 512 addresses (including all 0’s and all 1’s), starting at 128.211.200.0. a. What is the maximum address in this block? ? [Hint: figure out how many bits are required to represent 512 hosts. The maximum address is when all those bits are 1] 512 addresses run from 0 00000000 to 1 11111111 10000000 11010011 11001000 00000000 + 1 11111111 10000000 11010011 11001001 11111111 128.211.201.255 is the maximum address b. How many bits are in the host_id? The host id is 9 bits, as calculated above. c. How many bits are in the net_id? net id = 32 bits total – 9 bits host id = 23 bits net id d. What is the mask in binary, dotted decimal, and slash notation? 11111111 11111111 11111110 00000000 255.255.254.0 /23 2. A CIDR block extends from 112.45.156.0 to 112.45.159.255. a. How many bits are in the net id? min = 01110000 00101101 10011100 00000000 max = 01110000 00101101 10011111 11111111 The first 22 bits are identical, so the net id is 22 bits. b.

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HW7Solution - IT 120 Spring 2010 Homework 7 Solutions 1 We...

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