Common TCP and UDP Ports Quiz

What is the port number used for the File Transfer Protocol—Data (ftp-data)?

• 21

• 20

• 22

• 25

Answer explanation

The File Transfer Protocol—Data (ftp-data) uses port number 20 for data transfer, while port 21 is used for command control. Therefore, the correct answer is 20.

Which protocol uses port 21?

• smtp

• ftp

• telnet

• pop

Answer explanation

Port 21 is used by the File Transfer Protocol (FTP) for transferring files between a client and a server. The other options, such as SMTP, Telnet, and POP, use different ports.

What is the description for port 22 (ssh/sftp)?

• Secure Shell/FTP over SSH

• Hypertext Transfer Protocol

• Post Office Protocol version 3

• Simple Mail Transfer Protocol

Answer explanation

Port 22 is used for Secure Shell (SSH) and SFTP, which provides secure access and file transfer over a network. The correct choice, 'Secure Shell/FTP over SSH', accurately describes this functionality.

Port number for Telnet is ___

• 23

• 21

• 80

• 110

Answer explanation

The port number for Telnet is 23. This is the standard port used for establishing a Telnet connection, allowing users to access remote devices over a network.

Which service uses port 25?

• smtp

• imap

• pop

• tftp

Answer explanation

Port 25 is primarily used by the Simple Mail Transfer Protocol (SMTP) for sending emails. IMAP (port 143), POP (port 110), and TFTP (port 69) use different ports, making SMTP the correct choice for port 25.

Domain Name System uses which port number?

• 53

• 67

• 80

• 443

Answer explanation

The Domain Name System (DNS) operates on port 53, which is used for both UDP and TCP communications. This distinguishes it from other ports like 67 (DHCP), 80 (HTTP), and 443 (HTTPS).

What is the protocol for port 67?

• UDP

• TCP

• ICMP

• HTTP

Answer explanation

Port 67 is used by the Dynamic Host Configuration Protocol (DHCP) for client-server communication, which operates over UDP (User Datagram Protocol). Therefore, the correct answer is UDP.

Which port is used by the BOOTP/DHCP Client?

• 67

• 68

• 69

• 80

Answer explanation

The BOOTP/DHCP Client uses port 68 for client-side communication. Port 67 is used by the server to receive requests, while ports 69 and 80 are not related to BOOTP/DHCP functions.

Trivial File Transfer Protocol (tftp) uses port number ___.

• 69

• 21

• 80

• 443

Answer explanation

Trivial File Transfer Protocol (TFTP) operates on port number 69. This distinguishes it from other protocols like FTP (21), HTTP (80), and HTTPS (443), which use different port numbers.

What is the service for port 80?

• http

• ftp

• ssh

• smtp

Answer explanation

Port 80 is used for HTTP (Hypertext Transfer Protocol), which is the foundation of data communication on the web. The other options (ftp, ssh, smtp) correspond to different services and ports.