Port Numbers

Question 1

What is the port number for FTP (File Transfer Protocol)?

Answer 1

TCP 20/21: File transfer.

Question 2

What is the port number for SSH (Secure Shell)?

Answer 2

TCP 22: Secure remote access.

Question 3

What is the port number for Telnet?

Answer 3

TCP 23: Unsecure remote access.

Question 4

What is the port number for SMTP (Simple Mail Transfer Protocol)?

Answer 4

TCP 25: Sending emails.

Question 5

What is the port number for DNS (Domain Name System)?

Answer 5

UDP 53: Domain name resolution.

Question 6

What is the port number for DHCP (Dynamic Host Configuration Protocol)?

Answer 6

UDP 67/68: IP address assignment.

Question 7

What is the port number for TFTP (Trivial File Transfer Protocol)?

Answer 7

UDP 69: Simple file transfer.

Question 8

What is the port number for HTTP (Hypertext Transfer Protocol)?

Answer 8

TCP 80: Web browsing.

Question 9

What is the port number for POP3 (Post Office Protocol version 3)?

Answer 9

TCP 110: Receiving emails.

Question 10

What is the port number for NTP (Network Time Protocol)?

Answer 10

UDP 123: Time synchronization.

Question 11

What is the port number for IMAP (Internet Message Access Protocol)?

Answer 11

TCP 143: Email retrieval.

Question 12

What is the port number for HTTPS (Hypertext Transfer Protocol Secure)?

Answer 12

TCP 443: Secure web browsing.

Question 13

What is the port number for SMB (Server Message Block)?

Answer 13

TCP 445: File sharing.

Question 14

What is the port number for SNMP (Simple Network Management Protocol)?

Answer 14

UDP 161/162: Network management.

Question 15

What is the port number for LDAP (Lightweight Directory Access Protocol)?

Answer 15

TCP/UDP 389: Directory services.

Question 16

What is the port number for RDP (Remote Desktop Protocol)?

Answer 16

TCP 3389: Remote desktop access.