Networking Port & Protocol

Some of the Important Ports And Protocol : 

DNS : Domain Naming System
TCP : Transmission control protocol
IP : Internet Protocol
UDP : User Datagram protocol
FTP : File_Transfer_Protocol
TFTP : Trivial_File_Transfer_Protocol
RIP : Routing_Information_Protocol

SMTP : Simple_Mail_Transfer_Protocol
NNTP : Network_News_Transfer_Protocol
SNMP : Simple_Network_Management_Protocol
POP : Post_Office_Protocol
BGP : Border_Gateway_Protocol
PAP : Password_authentication_protocol
OSPF : Open_Shortest_Path_First
ICMP : Internet_Control_Message_Protocol
DHCP : Dynamic_Host_Configuration_Protocol
IGRP : Interior_Gateway_Routing_Protocol
CHAP : Challenge-Handshake_Authentication_Protocol
PPTP : Point-to-Point_Tunneling_Protocol
L2TP : Layer_2_Tunneling_Protocol
NFS : Network_File_System
NBIOS : NetBIOS
PING : Ping
ASP : Active_Server_Pages
FDDI : Fiber_Distributed_Data_Interface
ATM : Automated_teller_machine
IGMP : Internet_Group_Management_Protocol

Protocol	Port No.	Description
ftp	21	File Transfer Protocol
telnet	23	telnet
smtp	25	Simple mail transfer protocol
time	37	time server
rlp	39	Resource Location Protocol
dhcp	67	Dynamic host configration Protocol
domain	53	Domain Name Server
tftp	69	Trivial File Transfer
http	80	Hyper Text Transfer Protocol
hostname	101	Host Name Server
rtelnet	107	Remote Telnet Service
pop2	109	Post Office Protocol - Version 2
pop3	110	Post Office Protocol - Version 3
nntp	119	Network News Transfer Protocol
ntp	123	Network Time Protocol
imap	143	Internet Message Access Protocol
https	443	Hyper Text Transfer Protocol Sercue
ms-sql-s	1433	Microsoft-SQL-Server
pptp	1723	Point-to-point tunnelling protocol