Describe four of the six types of WAN encapsulation protocols.
- HDLC: The default encapsulation type on point-to-point connections, dedicated links, and circuit-switched connections when the link uses two Cisco devices.
- PPP: Provides router-to-router and host-to-network connections over synchronous and asynchronous circuits. PPP works with several network layer protocols, such as IP and IPX. PPP also has built-in security mechanisms such as PAP and CHAP.
- Serial Line Internet Protocol (SLIP): A standard protocol for point-to-point serial connections using TCP/IP. SLIP has been largely displaced by PPP.
- X.25/Link Access Procedure, Balanced (LAPB): An ITU-T standard that defines how connections between a DTE and DCE are maintained for remote terminal access and computer communications in public data networks. X.25 specifies LAPB, a data link layer protocol. X.25 is a predecessor to Frame Relay.
- Frame Relay: Industry-standard, switched, data link layer protocol that handles multiple virtual circuits. Frame Relay is a next-generation protocol after X.25. Frame Relay eliminates some of the time-consuming processes (such as error correction and flow control) employed in X.25.
- ATM: The international standard for cell relay in which devices send multiple service types (such as voice, video, or data) in fixed-length (53-byte) cells. Fixed-length cells allow processing to occur in hardware, thereby reducing transit delays. ATM takes advantage of high-speed transmission media such as E3, SONET, and T3.
Exam with this question: EWAN v4 Chapter 2 Check Your Understanding: PPP
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