Network+ Quick Reference: Ports, Protocols & Services

What protocol/service uses port 20/21?

• FTP (File Transfer Protocol)

• SMTP (Simple Mail Transfer Protocol)

• DNS (Domain Name System)

• HTTP (HyperText Transfer Protocol)

Which port is used for SSH (Secure Shell)?

• 22

• 21

• 23

• 80

Which protocol/service uses port 22 for secure file transfers over SSH?

• SFTP (Secure File Transfer Protocol)

• FTP (File Transfer Protocol)

• HTTP (HyperText Transfer Protocol)

• Telnet

What port is used for Telnet?

• 23

• 22

• 80

• 443

Which protocol/service uses port 25?

• SMTP (Simple Mail Transfer Protocol)

• HTTP (HyperText Transfer Protocol)

• FTP (File Transfer Protocol)

• DNS (Domain Name System)

What is the function of port 53?

• Translates domain names to IP addresses (DNS)

• Handles email transmission (SMTP)

• Provides file transfer services (FTP)

• Enables remote login (SSH)

Which protocol/service uses ports 67/68 for automatic IP address assignment?

• DHCP (Dynamic Host Configuration Protocol)

• FTP (File Transfer Protocol)

• SMTP (Simple Mail Transfer Protocol)

• DNS (Domain Name System)

What protocol/service uses port 69 for simplified file transfer without authentication?

• TFTP (Trivial File Transfer Protocol)

• FTP (File Transfer Protocol)

• SMTP (Simple Mail Transfer Protocol)

• SSH (Secure Shell)

Which port is used for HTTP (Hypertext Transfer Protocol)?

• 80

• 21

• 443

• 25

What is the function of port 123?

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