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9.0

Subnetting

Asked by MCSA2003 in Miscellaneous Networking, TCP/IP, Network Routers

Tags: CCNA, Subnetting

I am really struggling on learning how to subnet. This is no joke, I have been beating this stuff in my head for 2 days straight and I am no closer now than I was when I first started this chapter. Here is one example if someone could spoon feed me the answer I would appreciate it. I have an IP address of 138.43.39.152/29. I am trying to find the Network ID, the broadcast ID, the first usable host and the last usable host. Here is what I have done and I realize it is wrong, but this is where I am stuck.

                                  138.43.39.15
                                  255.255.255.240

  The subnet in binary form breks down to:
11111111 11111111 11111111 11111000

so I take the 0 bits and come up with 2 to the 3rd -2 which is 6 hosts per subnet. so I have the ip ranges as follows:

138.43.39.0 - 138.43.39.5
138.43.39.6 - 138.43.39.11

I keep doing this all the way to the 138.43.39.150 - 138.43.39.155 range as the original IP of 138.43.39.152 falls into this range. So I come up with the following:

138.43.39.150 as the network ID
138.43.39.155 as the Broadcast
138.43.39.151 - 138.43.39.154 as the available ip range This leaves me with 4 addresses to use + the 2 ip's for the network and broadcast which gives me the 6 hosts in that range.

Please explain to me where I am going wrong!!!!!
[+][-]10/13/09 08:27 PM, ID: 25567007Author Comment

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[+][-]10/13/09 08:59 PM, ID: 25567133Expert Comment

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[+][-]10/13/09 09:01 PM, ID: 25567143Expert Comment

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[+][-]10/13/09 09:13 PM, ID: 25567180Author Comment

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[+][-]10/13/09 09:22 PM, ID: 25567220Accepted Solution

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About this solution

Zones: Miscellaneous Networking, TCP/IP, Network Routers
Tags: CCNA, Subnetting
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Solution Provided By: RobWill
Participating Experts: 4
Solution Grade: A
 
[+][-]10/13/09 11:28 PM, ID: 25567765Expert Comment

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[+][-]10/13/09 11:32 PM, ID: 25567775Expert Comment

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[+][-]10/14/09 02:33 AM, ID: 25568547Expert Comment

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[+][-]10/14/09 02:39 AM, ID: 25568565Expert Comment

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[+][-]10/14/09 06:01 AM, ID: 25569935Expert Comment

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