if you are getting ready to take a COMPTia test, its a good idea to memorize these ports, there are alot of questions regarding ports on the exam. so its a good idea to remember all these. i know it helped me when i was taking the Network Plus exam. now im getting ready to take the Security + exam and i need to memorize these port numbers. so i put all these ports together to help me put them in my memory so i wont forget.

let me give you a tip.. memorize these ports, when you go take the test, they will give you paper to write on. as soon as you start the test, the first thing you should do is to write these on the paper. because when you are taking the test, you wont have to use much brain power to recall them from memory, you can use the memory power for the test. this will help you focus because you wont have to worry about memorizing the ports in your head, that way you will have them written down on the paper.. believe me.. it works!!

so here are the port i recommend you memorize:

ProtocolNamePort Number Notes
FTPFile Transfer Protocol20used for transfering files
FTPFile Transfer Protocol21used for transfering files
SSHSecure Shell 22Originally used for Unix
TELNETTelnet23Used For Remote Access
SMTPSimple Mail Transfer Protocol 25Used for OUTBOUND Traffic
TACACSTerminal Access Controller Access Control System 49Authentication Protocol developed by Cisco Systems
DNSDomain Name Service 53Resolves Domain Names into Ip Addresses
TFTPTrivial File Transfer Protocol69Like FTP, but more secured
HTTPHyperText Transfer Protocol80Its what you are using to view this page. It used in WWW
POP3Post Office Protocol Version 3 110used for INBOUND email traffic
NNTPNetwrok News Transport Protocol 119Used by sharing of News
NTPNetwrok Time Protocol 123Use for synchonizing your clock in your systems
IMAP4Internet Message Access Protocol Version 4 143i dont know what this is used for
SNMPSimple Network Management Protocol 161Is used in routers to manage the router
HTTPSHyperText Transfer Message Protocol Secure 443uses SSL to make web pages secured
IKEInternet Key Exchange 500Automated method for negotiating shared secret keys
L2TPLevel 2 Tunneling Protocol 1701an extension of PPP. used in VPNs Operate in Layer 2
PPPPoint-to-Point Protocol 1723used in dialup connections, replaced SLIP
ORACLE DB  1521 / 1522oracle databases
AOLAmerica Oline IM 5190 / 4443Instant Messenger Ports
BACKORIFICE 2000Virus1056this is a virus
PPTPPoint-to-Point Tunneling Protocol 2637 TUNNELING
DHCP Dynamic Host Configuration Protocol 67provides dynamic address assignment on a network
DHCP Dynamic Host Configuration Protocol 68provides dynamic address assignment on a network
file and printer shares  tcp/udp 137.138.139block these ports to avoid file sharing with public
NFSNetwork File Share2049block these ports to avoid file sharing with public
TOTAL PORTS  65,535There are a total of 65,535 Port.