You should understand which applications use which ports and why they use
them if you are a network administrator and to implement any type of
filtering. You should check out which network applications you use (SMTP,
DNS,.. etc ) and look them all up in the rfc to see how they work. Making
the access-lists will be a snap after that.
http://www.rfc-editor.org/rfc.html
""shella kevin"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> when dealing with access-list we use both TCP & UDP. For example we use
> tcp 53 or udp 53 for domain.
>
> My Q is when & how we know when we should use UDP and when TCP .........
> what is the difference .
>
>
>
> Thanks
>
> Shella K.
>
>
>
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