Common Ports Word Scramble
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| Question | Answer |
| 20 TCP 21 TCP | File Transfer Protocol (FTP) |
| 22 TCP and UDP | Secure Shell (SSH) |
| 23 TCP | Telnet |
| 25 TCP | Simple Mail Transfer Protocol (SMTP) |
| 49 TCP and UDP | Terminal Access Controller Access-Control System (TACACS) |
| *IP protocol number 50 | Encapsulating Security Payload (ESP) (used with IPSec) * Is not a port number, but an IP protocol number used with IPSec. |
| *IP protocol number 51 | Authenticating Header (AH) (used with IPSec) * Is not a port number, but an IP protocol number used with IPSec. |
| 53 TCP and UDP | Domain Name Server (DNS) |
| 67 UDP 68 UDP | Dynamic Host Configuration Protocol (DHCP) |
| 69 UDP | Trivial File Transfer Protocol (TFTP) |
| 80 TCP | HyperText Transfer Protocol (HTTP) |
| 88 TCP | Kerberos |
| 110 TCP | Post Office Protocol (POP3) |
| 119 TCP | Network News Transport Protocol (NNTP) |
| 123 UDP | Network Time Protocol (NTP) |
| 135 TCP 137 and 138 TCP and UDP 139 TCP | Network Basic Input/Output System (NetBIOS) |
| 143 TCP and UDP | Internet Message Access Protocol (IMAP4) |
| 161 TCP and UDP 162 TCP and UDP | Simple Network Management Protocol (SNMP) |
| 389 TCP and UDP | Lightweight Directory Access Protocol (LDAP) |
| 443 TCP and UDP | HTTP with Secure Sockets Layer (SSL) |
| 445 TCP | Windows 2000 CIFS/SMB (file access) |
| 500 UDP | Internet Key Exchange (IKE) (used with IPSec) |
| 636 TCP and UDP | Lightweight Directory Access Protocol over TLS/SSL (LDAPS) |
| 1701 UDP | Layer 2 Tunneling Protocol (L2TP) |
| 1723 TCP and UDP | Point-to-Point Tunneling Protocol (PPTP) |
| 1812 TCP and UDP 1813 TCP and UDP | Remote Authentication Dial In User Service (RADIUS) |
| 3389 TCP | Remote Desktop Protocol (RDP) |
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