1.0 Networking Concepts


1.5 Identify common TCP and UDP default ports.

  • SMTP

    SMTP typically uses TCP port 25


  • HTTP

    HTTP is typically implemented using TCP port 80.


  • HTTPS

    HTTPS is a lower level Application Layer protocol that typically uses TCP port 443 by default.


  • FTP

    File Transfer Protocol first establishes, then maintains a control connection throughout the session over TCP port 21. Then a second connection is opened over TCP port 20 for data transfer.


  • TELNET

    TELNET typically uses TCP port 23.


  • IMAP

    Internet Message Access Protocol - TCP/143


  • RDP

    Microsoft Terminal Server - 3389


  • SSH

    Secure Shell - 22


  • DNS

    Domain Name System - 53


  • DHCP

    Dynamic Host Configuration Protocol - UDP/67, UDP/68


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