Common Ports Network +

FTP (FIle Transfer Protocol) (TCP port 20 active mode data) (TCP port 21 control)

Transfers files between systems, generic file transfer method, not specifici to an OS

SSH( Secure Shell TCP 22

Encrypted communication link

SFTP (Secure File Transfer Protocol) TCP port 22

Generic file transfer with security, uses the SSH File Transfer Protocol.

Telnet(Telecommunication Network) TCP/23

Console access, clear unencrypted communication.

SMTP (Simple Mail Transfer Protocol) TCP/25 (SMTP using Plaintext) TCP/587(SMTP using TLS encryption)

Server to server email transfer, client-to-mail-server transfer

DNS (Domain Name System) UDP/53 (small queries) large queries use TCP/53

Converts domain names to IP addresses

DHCP(Dynamic Host Configuration Protocol (UDP/67 & UDP/68)

Automated configuration of IP address, subnet mask and other options (D

TFTP (Trivial File Transfer Protocol) (UDP/69)

very simple file transfer application, no authentication

HTTP & HTTPS (TCP/80) (TCP/443)

HTTP or HTTTP over SSL/TLS

NTP (Network TIme Protocol) (UDP/123)

Every device can synchronize clocks.

SNMP (Simple Network Management Protocol) (UDP/161)

Gather statistics from network devices, v3, secure: message integrity, authentication, and encryption.

LDAP (Lightweight Directory Access Protocol (TCP/389)

Allows for the storage and retrieval of information in a network directory

LDAPS (LDAP Secure) (TCP/636)

Non-standard implementation of LDAP over SSL

SMB (Server Message Block) (TCP/445 NetBIOS)

Allows for file sharing, printer sharing, integrated into the windows operating system

Syslog (UDP/514)

Standard for message logging

SQL (Structured Query Language) (TCP/1433)

Standard language to query databases

RDP(Remote Desktop Protocol) (TCP/3389)

Remote desktop services, share a desktop from remote location.

SIP(Session Initiation Protocol) (TCP 5060 & TCP 5061)

Set up and manage VoIP sessions, call, hang up.