Professor Messer Port Numbers
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18 questions
| 🇬🇧 | 🇬🇧 |
| FTP – File Transfer Protocol tcp 20 (active mode data), tcp 21 (control) | Transfers files between systems |
| SSH - Secure Shell - tcp 22 | Encrypted communication link • Looks and acts the same as Telnet |
| Telnet - tcp 23 | Insecure console access • Login to devices remotely • Not the best choice for production systems |
| Simple Mail Transfer Protocol SMTP tcp 25 | Used to send email from clients to servers, and for transferring email between servers. It never is used by clients to receive emails from servers |
| DNS - Domain Name System UDP 53 | Converts names to IP addresses |
| HTTP tcp 80 | Hypertext Transfer Protocol • Communication in the browser • And by other applications |
| HTTPS tcp 443 | Connections are encrypted using either Secure Socket Layer SSL or Transport Layer Security TLS protocols |
| Internet Message Access Protocol v4 tcp 143 | Used by clients to receive email from servers; never used to send email • Includes management of email inbox from multiple clients |
| RDP - Remote Desktop Protocol TCP port 3389 | Microsoft's proprietary remote access protocol |
| NetBIOS name service UDP 137 | Register, remove, and find Windows services by name |
| NetBIOS datagram service UDP 138 | Windows connectionless data transfer |
| NetBIOS session service TCP 139 | Windows connection-oriented data transfer |
| SMB tcp 445 Server Message Block | Windows file transfers and printer sharing |
| TCP 548 | Apple Filing Protocol Mac OS file transfers |
| Tcp 427, udp 427 | Service Location Protocol SLP Find Mac OS services by name |
| Udp 67, udp 68 | Dynamic Host Configuration Protocol DHCP |
| Tcp 389 | Lightweight Directory Access Protocol LDAP |
| UDP 161 | Simple Network Management Protocol SNMP |