1. HTTP (Hypertext Transfer Protocol)

2. FTP (File Transfer Protocol)

3. TCP/IP (Transmission Control Protocol/Internet Protocol)

4. SMTP (Simple Mail Transfer Protocol)

5. POP3 (Post Office Protocol version 3)

6. IMAP (Internet Message Access Protocol)

7. DNS (Domain Name System)

8. DHCP (Dynamic Host Configuration Protocol)

9. SNMP (Simple Network Management Protocol)

10. HTTPS (Hypertext Transfer Protocol Secure)

11. SIP (Session Initiation Protocol)

12. SSL/TLS (Secure Sockets Layer/Transport Layer Security)

13. ICMP (Internet Control Message Protocol)

14. PPP (Point-to-Point Protocol)

15. SSH (Secure Shell)