Chapter 5

Common Ports and Protocols

This chapter covers the following topics related to Objective 1.5 (Explain common ports and protocols, their application, and encrypted alternatives) of the CompTIA Network+ N10-008 certification exam:

  • File Transfer Protocol (FTP): Ports 20/21

  • Secure Shell (SSH): Port 22

  • Secure File Transfer Protocol (SFTP): Port 22

  • Telnet: Port 23

  • Simple Mail Transfer Protocol (SMTP): Port 25

  • Domain Name System (DNS): Port 53

  • Dynamic Host Configuration Protocol (DHCP): Ports 67/68

  • Trivial File Transfer Protocol (TFTP): Port 69

  • Hypertext Transfer Protocol (HTTP): Port 80

  • Post Office Protocol v3 (POP3): Port 110

  • Network Time Protocol (NTP): Port 123

  • Internet Message Access Protocol (IMAP): Port 143

  • Simple Network Management ...

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