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# 1 - CS 176A Homework 2B Sean Chen 3642584 1 2^(32-14 2 =...

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CS 176A Homework 2B Sean Chen 3642584 11/17/11 1. 2^(32-14) - 2 = 262,142 valid host addresses 2. 2^(32-20) – 2 = 4,094 valid host addresses 3. Yes, 130.207.52/22 is a valid network because if you apply the network mask, the prefix remains the same. 10000010 11001111 00110100 00000000 = 130.207.52.0/22 11111111 11111111 11111100 00000000 = 255.255.252.0/22 10000010 11001111 00110100 00000000 = 130.207.52.0/22 4. 10000010 11011000 00100011 0001xxxx = 130.216.35.16/28 Lower Bound: 10000010 11011000 00100011 00010000 = 130.216.35.16 Upper Bound: 10000010 11011000 00100011 00011111 = 130.216.35.31 The range of addresses covered for 130.216.35.16/28 is 130.216.35.16 to 130.216.35.31 5. 00100110 1xxxxxxx xxxxxxxx xxxxxxxx = 38.128/9 Lower Bound: 00100110 10000000 00000000 00000000 = 38.128.0.0 Upper Bound: 00100110 11111111 11111111 11111111 = 38.255.255.255 The range of addresses covered for 38.128/9 is 38.128.0.0 to 38.255.255.255 6. 10101111 01101111 xxxxxxxx xxxxxxxx = 175.111/16 175.111.0/19, 175.111.32/19, 175.111.64/19, 175.111.96/19, 175.111.128/19 175.111.160/19, 175.111.192/19, 175.111.224/19 2^(32-19)-2 = 8,190 valid host addresses in each of the 8 new networks 7. The network mask length is /19. The dotted quote notation with masking is 255.255.224.0 8. 01100011 101010xx xxxxxxxx xxxxxxxx = 99.168/14 01100011 10101000 xxxxxxxx xxxxxxxx = 99.168.0/16 01100011 10101001 xxxxxxxx xxxxxxxx = 99.169.0/16 01100011 10101010 xxxxxxxx xxxxxxxx = 99.170.0/16 01100011 10101011 xxxxxxxx xxxxxxxx = 99.171.0/16 The ranges are 99.168.0.0 to 99.168.255.255, 99.169.0.0 to 99.169.255.255, 99.170.0.0 to 99.170.255.255, and 99.171.0.0 to 99.171.255.255 9. 10000000 11100111 001xxxxx xxxxxxxx = 128.231.32/19 10000000 11100111 00100001 xxxxxxxx = 128.231.33/19

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