Subnet masks — which should I use to solve this problem?

5 pts.
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Calculate subnet mask
Subnet mask calculation
Subnets
Windows XP
Windows XP Professional
I have a office. which has 3 department and each department have 6 PC . I want to subnet the hosts that each department can communicate with there people but the cannot communicate with other departments people. In that case which SUBNET MASK  i can use to solve the problem. Please solve my problem.  

Software/Hardware used:
Windows XP Prof.

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You can have any type of subnet you want. The minimum for 6 machines would be a /28 subnet.

A basic plan would be:
192.168.1.1/24 – Department 1
192.168.2.1/24 – Department 2
192.168.3.1/24 – Department 3

Discuss This Question: 3  Replies

 
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  • TomLiotta
    Using /28 subnets provides for exactly six hosts. No chance of adding an additional host if needed. Technically, it's possible, but I'd never advise it. That would mean going to /27 just in case. A requirement for three subnets means that two bits are required to keep them separate. Two bits actually allows the possibility of four subnets -- 00, 01, 10 and 11 -- so there's an additional subnet left available if needed. That means dropping to /25 instead of /27. However: A basic plan would be: 192.168.1.1/24 - Department 1 192.168.1.2/24 - Department 2 192.168.1.3/24 - Department 3 As near as I can tell, those all fall in the same single subnet -- 192.168.1.0/24. Tom
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  • mshen
    Tom, you caught my mistake. What I mean was 192.168.1.1/24 192.168.2.1/24 192.168.3.1/24 Thanks for the update
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  • Darkstar911
    you can do vlans with a switch and not provid routing betweent he vlans.
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