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20+21: FTP - File Transfer Protocol

Provides file transfers with no encryption (insecure)

22: SSH - Secure Shell

Provides secure remote control of another machine using a text-based enviorment. (No GUI)

23: Telnet

Provides insecure remote control of another machine using a text-based enviorment.

25: SMTP - Simple Mail Transfer Protocol

Provides the ability to send emails over the network.

53: DNS - Domain Name Service

Converts domain names to IP addresses and vise versa.

67+68: DHCP - Dynamic Host Configuration Protocol

Automatically provides network parameters to clients, such as assigned IP addresses, subnet mask, default gateway, and the DNS server they should be using.

69: TFTP - Trivial File Transfer Protocol

Insecure file transfer protocol which uses UDP (faster), no authentication or encryption.

80: HTTP - HyperText Transfer Protocol

Used for insecure web browsing.

110: POP3 - Post Office Protocol V3

Used for recieving incoming emails

137-139: NetBIOS

Used for file or printer sharing in a Windows network.

143: IMAP - Internet Mail Application Protocol

A newer method of retrieving incoming emails which improves on POP3.

161+162: SNMP - Simple Network Management Protocol

Used to collect data about network devices and moniter their status.

389: LDAP - Lightweight Directory Access Protocol

Provides directory services to the network.

443: HTTPS - HyperText Transfer Protocol Secure

Used as a secure and encrypted version of web browsing.

445: SMB - Server Message Block

Used for Windows file and printer sharing services.

3389: Remote Desktop Protocol

Provides a graphical remote control of another client or server.

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