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Link Layer Network Protocols
These network protocols directly manage the physical network link of a computer and also interface to higher level protocols for handling connections and data.
PPP
PPP (Point to Point Protocol) is a standard TCP/IP protocol for serial line communications commonly used for dial-up networking between modems. PPP operates at Layer 2 (Data Link) of the OSI model.
ATM Protocol - Asynchronous Transfer Mode Networking
ATM is a high-speed networking standard designed to support both voice and data communications. ATM operates at the data link layer (OSI Layer 2) over either fiber or twisted-pair cable.
Token Ring
Token Ring is a data link technology for local area networks (LANs). Unlike all other standard forms of LAN interconnects, Token Ring maintains one or more common data frames that continuously circulates through the network. Token Ring was developed by IBM during the 1980s as an alternative to Ethernet.
Frame Relay
Frame relay is a network protocol designed for use on Wide Area Networks (WANs). Frame relay works over fiber optic or ISDN lines.
FireWire
FireWire (IEEE 1394) is a high-speed serial networking standard for connecting a computer to a nearby peripheral device such as a digital video camera.