Common Network Ports

I thought it would be helpful to me to have the common network ports handy. I am Network+ certified, but sometimes I forget them.

Port Number	Protocol	Description
20 and 21	FTP	File Transfer Protocol is used for sending files to and from a server
22	SSH	The Secure Shell Protocol is used for sending encrypted data to a server
23	Telnet	Telnet is used for an providing an unsecure interface to a server shell
25	SMTP	The SMTP Protocol used for sending email between servers
53	DNS	The Domain Naming Service is used to match computer names to IP Addresses on a network
67	DHCP	The Dynamic Host Configuration Protocol enables client computers to obtain a valid IP address on a network
80	HTTP	HTTP allows clients to request web pages from servers
109, 110	POP	Allows clients to communicate with email servers to read messages in their mailbox
137-139	SMB	Microsoft servers use this for file and print sharing
143, 220	IMAP	Provides advanced mailbox services for clients
389	LDAP	LDAP provides access to directory services for authenticating
443	HTTPS	Provides encrypted communication with web servers
2049	NFS	Provides file sharing between Unix and Linux systems

In my learnning environment, when I typed in cat /etc/services in bash it listed all of the services available on my linux server.