DNS- Domain Name System
DHCP- Dynamic Host Configuration Protocol
FTP- File Transfer Protocol
TFTP- Trivial File Transfer Protocol
HTTP- Hyper Text Transfer Protocol
Telnet- Telephony Network
SMTP- Simple Mail Transfer Protocol
POP- Post Office Protocol
IMAP- Internet Massage Access Protocol
NetBIOS- Network Basic Input/Output System
TCP- Transmission Control Protocol
UDP- User Datagram Protocol
IP- Internet Protocol
ICMP- Internet Control Massage Protocol
ARP- Address Resolution Protocol
RARP- Reserve Address Resolution Protocol
HDLC- High-level Data Link Control Protocol
SDLC- Synchronous Data Link Control Protocol
There is associated Port number to every Application Protocol.
[Note: to see port number with protocol “c:\windows\system32\driver\etc” open this file with notepad]
