Application Layer (OSI) / Application Layer (TCP/IP)

• HTTP: Hypertext Transfer Protocol
• HTTPS: HTTP Secure
• FTP: File Transfer Protocol
• SMTP: Simple Mail Transfer Protocol
• POP3: Post Office Protocol version 3
• IMAP: Internet Message Access Protocol
• DNS: Domain Name System
• DHCP: Dynamic Host Configuration Protocol
• SNMP: Simple Network Management Protocol
• Telnet: Telecommunication Network
• SSH: Secure Shell
• RTP: Real-time Transport Protocol
• SIP: Session Initiation Protocol
• NTP: Network Time Protocol
• LDAP: Lightweight Directory Access Protocol

Presentation Layer (OSI) / Application Layer (TCP/IP)

• SSL: Secure Sockets Layer (often used with HTTP -> HTTPS)
• TLS: Transport Layer Security (newer and preferred over SSL, also used with HTTP -> HTTPS)

Session Layer (OSI) / Application Layer (TCP/IP)

• NetBIOS: Network Basic Input/Output System
• SMB: Server Message Block
• NFS: Network File System

Transport Layer (OSI and TCP/IP)

• TCP: Transmission Control Protocol
• UDP: User Datagram Protocol

Network Layer (OSI) / Internet Layer (TCP/IP)

• IP: Internet Protocol (IPv4 and IPv6)
• ICMP: Internet Control Message Protocol
• ARP: Address Resolution Protocol
• RARP: Reverse Address Resolution Protocol

Data Link Layer (OSI) / Network Access Layer (TCP/IP)

• Ethernet: (No common shortcut, but often implied by terms like "LAN")
• MAC: Media Access Control (refers to the sub-layer and addresses)
• PPP: Point-to-Point Protocol
• SLIP: Serial Line Internet Protocol
• Frame Relay: (No common shortcut)
• ATM: Asynchronous Transfer Mode

Physical Layer (OSI) / Network Access Layer (TCP/IP)

While not strictly protocols in the same way as the upper layers, terms related to physical media and signaling include:

• UTP: Unshielded Twisted Pair
• STP: Shielded Twisted Pair
• Fiber Optic: (No common shortcut)
• Wi-Fi: (IEEE 802.11 standards)
• Bluetooth: (No common shortcut)