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- Provides point to point connections by creating virtual circuit paths.
- Forwards frames and performs error check only at the end points.
- Is designed to operate over unreliable network lines
- works with the physical, data link and network layers of the OSI model.
- X.25: defines communication between DTE and DCE devices.
- Switched multimegabit data services (SMDS):
- Is a connectionless protocol and can provide bandwidth for exchange of large amounts of data.
- A connectionless, high-speed, datagram-based WAN technology for communication over public data networks.
- Frame Relay: Forwards packets to their destinations and doesn’t unpack frames at each node.
- Link access procedure balanced (LAPB): Ensures that frames are conrrectly sequenced and error free.
- Asynchronous transfer mode (ATM):
- transmits data in fixed size cells of 53 byte and can provide bandwidth on demand.
- Connection oriented switching technology that uses a cell-switching method.
- Synchronous data link control (SDLC): bit oriented synchronous protocol.
- High level data link control (HDLC): A bit oriented data link protocol.
- Switching: A virtual connection which acts like a dedicated link between the sender and the receiver devices.
- Password authentication protocol (PAP): uses an authentication server to compare supplied credentials against stored credentials.
- Challenge handshake authentication protocol (CHAP): enables user auth without revealing a shared password between two entities.
- Extensible Authentication Protocol (EAP): works directly at the data link layer.
- Point-to-point protocol (PPP): Supports asynchronous and synchronous connections and network protocol multiplexing.
- Serial Line Internet Protocol (SLIP): Frames datagrams for transmission but doesn’t provide error detection or data compression.