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R1 receives a Frame Relay frame from R2 with DLCI value 100 in it. Which of the following statements is the most accurate?
DLCI 100 represents R1.
DLCI 100 represents R2.
100 is the local DLCI on the access link of R2 and it represents the R1-R2 virtual circuit.
100 is the local DLCI on the access link of R1 and it represents the R1-R2 virtual circuit.
Frame Relay has a 10-bit field in the frame header known as DLCI (Data Link Connection Identifier), which is used for Frame Relay addressing. DLCI values are only significant on the local hop and they can change as a frame traverses a Frame Relay network. When R1 receives a frame from R2, the DLCI value of 100 contained in the frame identifies the R1-R2 VC (virtual circuit) to R1. The DLCI value of 100 is significant only on the access link between R1 and nearest Frame Relay switch. At the far end of the same VC, the access link from R2 to its nearest Frame Relay switch would typically use a different DLCI value.
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