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Port & Protocol Reference

52 essential ports for Security+, Network+, and CCNA exams. Study the table or test yourself in quiz mode.

Showing 52 of 52 ports
PortProtocolServiceDescriptionExams
20TCPFTP DataFile Transfer Protocol – data channel
Network+CCNA
21TCPFTP ControlFile Transfer Protocol – control channel
Network+CCNASecurity+
22TCPSSHSecure Shell – encrypted remote access
Security+Network+CCNA
23TCPTelnetUnencrypted remote terminal access
Network+CCNA
25TCPSMTPSimple Mail Transfer Protocol – outbound email
Security+Network+
49TCP/UDPTACACSTerminal Access Controller Access Control
Security+CCNA
53TCP/UDPDNSDomain Name System – name resolution
Network+CCNASecurity+
67UDPDHCP ServerDynamic Host Config – server to client
Network+CCNA
68UDPDHCP ClientDynamic Host Config – client to server
Network+CCNA
69UDPTFTPTrivial FTP – simple no-auth file transfer
Network+CCNA
80TCPHTTPHypertext Transfer Protocol – web traffic
Network+Security+CCNA
88TCP/UDPKerberosAuthentication protocol
Security+
110TCPPOP3Post Office Protocol v3 – email retrieval
Security+Network+
119TCPNNTPNetwork News Transfer Protocol
Network+
123UDPNTPNetwork Time Protocol – time sync
Network+CCNASecurity+
135TCPRPC/DCOMMS Remote Procedure Call
Security+
137UDPNetBIOS-NSNetBIOS Name Service
Network+Security+
138UDPNetBIOS-DGMNetBIOS Datagram Service
Network+Security+
139TCPNetBIOS-SSNNetBIOS Session Service
Network+Security+
143TCPIMAPInternet Message Access Protocol
Security+Network+
161UDPSNMPSimple Network Management Protocol – queries
Network+CCNASecurity+
162UDPSNMP TrapSNMP unsolicited alert messages
Network+CCNA
179TCPBGPBorder Gateway Protocol – internet routing
Network+CCNA
194TCPIRCInternet Relay Chat
Security+
389TCPLDAPLightweight Directory Access Protocol
Security+Network+
443TCPHTTPSHTTP over TLS – secure web traffic
Network+Security+CCNA
445TCPSMBServer Message Block – Windows file sharing
Security+Network+
465TCPSMTPSSMTP over SSL – secure email sending
Security+
500UDPIKE/ISAKMPIPsec key exchange
Security+Network+
514UDPSyslogSystem logging protocol
Network+Security+
515TCPLPDLine Printer Daemon – printing
Network+
587TCPSMTP SubmissionAuthenticated email submission
Security+
636TCPLDAPSLDAP over SSL
Security+
989TCPFTPS DataFTP over TLS – data channel
Security+Network+
990TCPFTPS ControlFTP over TLS – control channel
Security+Network+
993TCPIMAPSIMAP over SSL
Security+Network+
995TCPPOP3SPOP3 over SSL
Security+Network+
1080TCPSOCKSSOCKS proxy protocol
Security+
1194UDPOpenVPNOpenVPN tunnel protocol
Security+Network+
1433TCPMSSQLMicrosoft SQL Server
Security+
1521TCPOracle DBOracle Database listener
Security+
1701UDPL2TPLayer 2 Tunneling Protocol
Security+Network+
1723TCPPPTPPoint-to-Point Tunneling Protocol – VPN
Security+Network+
1812UDPRADIUS AuthRemote Authentication Dial-In User Service
Security+CCNA
1813UDPRADIUS AcctRADIUS accounting
Security+CCNA
2049TCP/UDPNFSNetwork File System
Network+
3306TCPMySQLMySQL database
Security+
3389TCPRDPRemote Desktop Protocol
Security+Network+
5060TCP/UDPSIPSession Initiation Protocol – VoIP
Network+CCNA
5900TCPVNCVirtual Network Computing – remote desktop
Security+Network+
8080TCPHTTP-AltAlternate HTTP port, often web proxies
Network+CCNA
8443TCPHTTPS-AltAlternate HTTPS port
Network+

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