tailieunhanh - Frame Relay

Frame Relay is actually a group of separate standards, including those from ITU-T and ANSI. Interestingly enough, Frame Relay defines only the interaction between the Frame Relay CPE and the Frame Relay carrier switch. The connection across the carrier’s network is not defined by the Frame Relay standards. Most carriers, however, use ATM as a transport to move Frame Relay frames between different sites. | CCNA CISCO CERTIFIED NETWORK ASSOCIATE 16 Frame Relay CERTIFICATION OBJECTIVES Virtual Circuits Terminology and Operation Frame Relay Configuration Q A Nonbroadcast Multiaccess Two-Minute Drill Self Test 2 Chapter 16 Frame Relay . . . . hapter 15 introduced you to wide area networking and point-to-point connections using HDLC and PPP for a data link layer encapsulation. These protocols are common with leased lines and circuit-switched connections. This chapter introduces you to the next WAN topic Frame Relay. Frame Relay is a data link layer packet-switching protocol that uses digital circuits and thus is virtually error-free. Therefore it performs only error detection it leaves error correction to an upper-layer protocol such as TCP. Frame Relay is actually a group of separate standards including those from ITU-T and ANSI. Interestingly enough Frame Relay defines only the interaction between the Frame Relay CPE and the Frame Relay carrier switch. The connection across the carrier s network is not defined by the Frame Relay standards. Most carriers however use ATM as a transport to move Frame Relay frames between different sites. CERTIFICATION OBJECTIVE Virtual Circuits VCs Frame Relay is connection-oriented a connection must be established before information can be sent to a remote device. The connections used by Frame Relay are provided by virtual circuits VCs . A VC is a logical connection between two devices therefore many of these VCs can exist on the same physical connection. The advantage that VCs have over leased lines is that they can provide full connectivity at a much lower price. VCs are also full-duplex you can simultaneously send and receive on the same VC. Other packet- and cell-switching technologies such as ATM SMDS and also use VCs. Most of the things covered in this section concerning VCs are true of Frame Relay as well as these other technologies. Full-Meshed Design As mentioned in the preceding paragraph VCs .

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