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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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Chapter 4: Frame Relay

Exam Objectives

Understanding Frame Relay WAN connections

Examining permanent and switched virtual circuits

Defining link status control and LMI

Controlling congestion using DE, FECN, and BECN

Introducing Frame Relay address resolution using Inverse ARP

Managing Frame Relay

Configuring Cisco interfaces using Frame Relay

Monitoring and troubleshooting Frame Relay

Configuring Frame Relay using the Cisco SDM GUI

Introducing Frame Relay

Frame Relay is an efficient, high-performance, Layer 2 packet-switched WAN technology that shares available bandwidth among users on a packet-switched network medium. Like Point-to-Point Protocol (PPP) and High-Level Data Link Control (HDLC), Frame Relay operates at the physical and data link layers of the OSI model and relies on upper-layer protocols to provide the mechanism for data error correction and flow control. For instance, TCP — not Frame Relay — is responsible for providing the error-checking functionality for IP-based packets. The Frame Relay protocol is also considered to be a replacement for network layer X.25 technology and was originally designed for use with Integrated Services Digital Networks (ISDNs). Today, Frame Relay is a widely popular standard used over a variety of network interfaces and is preferred to X.25 technology. It is a more streamlined, bandwidth-efficient method of connecting local-area networks (LANs) together via wide-area networks (WANs). Frame Relay also provides virtual circuit multiplexing ...

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