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Need help with TCP/IP (DOD) model

post #1 of 7
Thread Starter 
Hey guys,

I'm in the middle of writing a 500 word paper on how to use the TCP/IP model (the 4 layers) step by step to troubleshoot a problem. I have tried all afternoon to find a good example of this to no avail. Please throw me a bone.

Thanks!
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post #2 of 7
Example? like what kind of an example? Like a sandwhich? see first you have the bread(that includes mayo and musturd and what not) then cheese, then pickles and finally you get the meat.
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post #3 of 7
Quote:
Originally Posted by Blue_Fire View Post
Example? like what kind of an example? Like a sandwhich? see first you have the bread(that includes mayo and musturd and what not) then cheese, then pickles and finally you get the meat.
That was helpful...bump...for some info!!
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Blue_Fire View Post
Example? like what kind of an example? Like a sandwhich? see first you have the bread(that includes mayo and musturd and what not) then cheese, then pickles and finally you get the meat.
No, more like say a friend is having a problem accessing email on a network at work. How would you troubleshoot the problem using the layers of the TCP/IP model?
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post #5 of 7
Wow I read a book on this. Except I dont remember much. Ill post back here tommorow the books at school
    
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post #6 of 7
I don't know the DoD model, just the good-ol 7-layer OSI model. You always start from the bottom, and work up. For example:

Physical layer - is the network cable plugged in??
Network layer - Does the card have an IP address? Is it on the same subnet? Can you ping the mail server? Can you ping anything??
Application layer - I think using Telnet as a troubleshooting tool falls here. Can you Telnet to port 25 on the mail server? If so, then the mail server is accepting connections, and your machine can get there over port 25 (SMTP). If not, then you need to work down the OSI model until you find the issue.
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by mrblink View Post
I don't know the DoD model, just the good-ol 7-layer OSI model. You always start from the bottom, and work up. For example:

Physical layer - is the network cable plugged in??
Network layer - Does the card have an IP address? Is it on the same subnet? Can you ping the mail server? Can you ping anything??
Application layer - I think using Telnet as a troubleshooting tool falls here. Can you Telnet to port 25 on the mail server? If so, then the mail server is accepting connections, and your machine can get there over port 25 (SMTP). If not, then you need to work down the OSI model until you find the issue.
Good stuff, thanks.
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