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a question about port

 
Balaji Londhe
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One server can run 65536 server apps as different server app runs on a different port no & a port no is of 16 bit.Ok.
Now a statement is given in HFSJ that "it's possible to run more than one server apps on same port no if they use differnt protocols".

So what does this "differnt protocol" mean ?
If a server uses SMTP & another uses FTP, can they run on same port no? OR protocol should be different in TCP/UDP manner ?

Is there any relation between TCP & SMTP,FTP,Time,HTTP....?
 
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