Example 1110 continued 1 23 figure 1130 example of

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Example 11.10 (continued)
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1 23 Figure 11.30 Example of piggybacking without error
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1 24 Figure 11.31 shows an exchange in which a frame is lost. Node B sends three data frames (0, 1, and 2), but frame 1 is lost. When node A receives frame 2, it discards it and sends a REJ frame for frame 1. Note that the protocol being used is Go-Back-N with the special use of an REJ frame as a NAK frame. The NAK frame does two things here: It confirms the receipt of frame 0 and declares that frame 1 and any following frames must be resent. Node B, after receiving the REJ frame, resends frames 1 and 2. Node A acknowledges the receipt by sending an RR frame (ACK) with acknowledgment number 3. Example 11.11
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1 25 Figure 11.31 Example of piggybacking with error
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1 26 11-7 POINT-TO-POINT PROTOCOL Although HDLC is a general protocol that can be used for both point-to-point and multipoint configurations, one of the most common protocols for point-to-point access is the Point-to-Point Protocol (PPP). PPP is a byte-oriented protocol. Framing Transition Phases Multiplexing Multilink PPP Topics discussed in this section:
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1 27 Figure 11.32 PPP frame format
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1 28 PPP is a byte-oriented protocol using byte stuffing with the escape byte 01111101. Note
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1 29 Figure 11.33 Transition phases
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1 30 Figure 11.34 Multiplexing in PPP
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