how to write(implement) Application layer network protocol

Question

I want to write(implement) a Application layer network protocol above TCP. Can you tell me how to start doing it? Any online tutorial will also be helpful guys i need sm implementation tutorial too. I am new to this and have less time also :( RFC is more about rules

Answer 1

Start by reading a standard for SMTP protocol. This is (originally) a very simple protocol with no strings attached and no confusing or bogus statements. HTTP and FTP are more complicated (for beginner) as they are more feature-rich, non-linear (in many aspects) etc.

Upd: I've put the link to the original RFC 821 , which is now obsolete. Yet it is much smaller and easier to read than the most recent (and valid) RFC for SMTP.