Network+ Common TCP and UDP Ports

Port for Simple Mail Transfer Protocol (SMTP)?

• TCP 25 – Sends emails from your device to the email server.

• TCP 80 – Used for HTTP traffic.

• TCP 443 – Used for HTTPS traffic.

• TCP 21 – Used for FTP traffic.

Kerberos

• UDP 88 – A secure authentication protocol used to verify identities over a network.

• TCP 80 – A protocol for transferring web pages over the internet.

• UDP 53 – A protocol used for domain name resolution.

• TCP 443 – A secure protocol for transferring files over the internet.

Port for Service Location Protocol (SLP)?

• 80 – Used for HTTP traffic.

• 443 – Used for HTTPS traffic.

• 427 – Helps computers find services like printers on a local network.

• 25 – Used for SMTP email transmission.

Port for Apple Filing Protocol (AFP)?

• 80 – Used for HTTP traffic.

• 443 – Used for HTTPS traffic.

• 548 – Used by Apple devices to share files over a local network.

• 21 – Used for FTP traffic.

Port for HyperText Transfer Protocol Secure (HTTPS)?

• TCP 80 – Standard web traffic port.

• TCP 443 – Secures website access with encryption.

• TCP 21 – File Transfer Protocol (FTP) port.

• TCP 25 – Simple Mail Transfer Protocol (SMTP) port.

Ports for Dynamic Host Configuration Protocol (DHCP)?

• UDP 67, 68 – Automatically gives devices their IP addresses on a network.

• TCP 80, 443 – Used for web traffic.

• UDP 53 – Used for DNS queries.

• TCP 25 – Used for email transmission.

Port for Internet Message Access Protocol (IMAP)?

• TCP 25 – Used for sending emails via SMTP.

• TCP 110 – Used for Post Office Protocol (POP3).

• TCP 143 – Lets you access email messages on a mail server from different devices.

• TCP 587 – Used for email submission.

Port for Telecommunications Network Protocol (Telnet)?

• TCP 22 – Secure Shell (SSH)

• TCP 23 – Connects to remote computers, but without encryption (not secure).

• TCP 80 – Hypertext Transfer Protocol (HTTP)

• TCP 443 – Hypertext Transfer Protocol Secure (HTTPS)

Port for Trivial File Transfer Protocol (TFTP)?

• TCP 21

• UDP 69

• TCP 80

• UDP 53

Port for Post Office Protocol version 3 (POP3)?

• TCP 110 – Downloads emails from the server to your device.

• TCP 25 – Used for sending emails via SMTP.

• TCP 143 – Used for Internet Message Access Protocol (IMAP).

• TCP 80 – Used for HTTP traffic.