Here are some of the common network protocols covered by the Security+ exam, along with their port numbers:
File Transfer Protocols
| Name | Definition | TCP | UDP | Port Number |
|---|---|---|---|---|
| FTP | File Transport Protocol | X | 20, 21 | |
| SSH | Secure Shell | X | 22 | |
| SFTP | Secure File Transport Protocol (uses SSH) | X | 22 | |
| SCP | Secure Copy (uses SSH) | X | 22 | |
| TFTP | Trivial File Transport Protocol | X | 69 | |
| FTPS | File Transport Protocol Secure (uses SSL) | X | 443 |
Email Protocols
| Name | Definition | TCP | UDP | Port Number |
|---|---|---|---|---|
| SMTP | File Transport Protocol | X | 20, 21 | |
| POP3 | Secure Shell | X | 22 | |
| IMAP4 | Secure File Transport Protocol (uses SSH) | X | 22 |
Remote Access
| Name | Definition | TCP | UDP | Port Number |
|---|---|---|---|---|
| Telnet | Telnet | X | 23 | |
| TACACS | Terminal Access Controller Access-Control System | X | 49 | |
| TACACS+ | Terminal Access Controller Access-Control System+ | X | 49 | |
| SSL VPN | SSL VPN – Secure Sockets Layer virtual private network | X | 443 | |
| ISAKMP (VPN) | Internet Security Association and Key Management Protocol (virtual private network) | X | 500 | |
| L2TP | Layer 2 Tunneling Protocol | X | 1701 | |
| PPTP | Point-to-Point Tunneling Protocol | X | X | 1723 |
| RDP | Remote Desktop Protocol | X | X | 3389 |
Other Protocols
| Name | Definition | TCP | UDP | Port Number |
|---|---|---|---|---|
| DNS | Domain Name System | X | X | 53 |
| DHCP | Dynamic Host Configuration Protocol | X | 67, 68 | |
| HTTP | Hypertext Transfer Protocol | X | 80 | |
| HTTPS | Hypertext Transfer Protocol Secure | X | 443 | |
| Kerberos | Kerberos | X | X | 88 |
| NNTP | Network News Transfer Protocol | X | 119 | |
| SNMP | Simple Network Management Protocol | X | 161 | |
| SNMP Trap | Simple Network Management Protocol Trap | X | X | 162 |
| LDAP | Lightweight Directory Access Protocol | X | X | 389 |
| Syslog | Syslog | X | 514 |