# dividing subnets

December 1, 2009 at 13:44:46
Specs: Windows XP, ?

 I have a question about subnetting on one of my assignment. i'm having a lot of problems with it. the question is as followed.you have been assigned the network address 172.32.0.0 with a subnet of 255.255.0.0 to use on your LAN. you need to divide the network into seven subnets. what subnet mask do you use?if someone could help me with this question and maybe give me the formula on how to work this out i would be very grateful.thanks Matt

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#1
December 1, 2009 at 13:50:51

 Perhaps this can be helpful

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#2
December 1, 2009 at 19:11:58

 You need 3 bits for the 7 subnets.Because 2^3 = 8 (the smalles possible)subnet-maskdecimal255.255.0.0binary11111111.11111111.00000000.00000000-----------------------------^ You'll start to add the 3 bits from hereSo the new subnet-mask is:decimal255.255.255.224.0in binary11111111.11111111.[111]00000.00000000The part 00000.00000000 are the bits for the amount of hosts, possible in each network.So 2 power 13 (2^13) = 8192 (hosts per subnet)So the usable subnets are:11111111.11111111.[000]00000.0000000011111111.11111111.[001]00000.0000000011111111.11111111.[010]00000.0000000011111111.11111111.[011]00000.0000000011111111.11111111.[100]00000.0000000011111111.11111111.[101]00000.0000000011111111.11111111.[110]00000.0000000011111111.11111111.[111]00000.00000000The subnets are:1. Subnet172.32.0.1 - 172.32.31.25510101100 . 00100000 . [000]00000 . 00000001 - 10101100 . 00100000 . [000]11111 . 111111112. Subnet172.32.32.1 - 172.32.63.25510101100 . 00100000 . [001]00000 . 00000001 - 10101100 . 00100000 . [001]11111 . 111111113. Subnet172.32.64.1 - 172.32.95.25510101100 . 00100000 . [010]00000 . 00000001 - 10101100 . 00100000 . [010]11111 . 111111114. Subnet172.32.96.1 - 172.32.127.25510101100 . 00100000 . [011]00000 . 00000001 - 10101100 . 00100000 . [011]11111 . 111111115. Subnet172.32.128.1 - 172.32.159.25510101100 . 00100000 . [100]00000 . 00000001 - 10101100 . 00100000 . [100]11111 . 111111116. Subnet172.32.160.1 - 172.32.191.25510101100 . 00100000 . [101]00000 . 00000001 - 10101100 . 00100000 . [101]11111 . 111111117. Subnet172.32.192.1 - 172.32.223.25510101100 . 00100000 . [110]00000 . 00000001 - 10101100 . 00100000 . [110]11111 . 111111118. Subnet172.32.224.1 - 172.32.255.25510101100 . 00100000 . [111]00000 . 00000001 - 10101100 . 00100000 . [111]11111 . 11111111

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#3
December 3, 2009 at 13:10:03

 Thank you so much. your've been very helpfull.

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