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command and response Meaning
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Set normal response mode Set normal response mode, extended Set asynchronous balanced mode or disconnect mode Set asynchronous balanced mode, extended Unnumbered information Unnumbered acknowledgment Disconnect or request disconnect Set initialization mode or request information mode Unnumbered poll Reset Exchange ID Frame reject
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SECTION 116 HDLC
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Example 119: Connection/Disconnection
Figure 1129 shows how V-frames can be used for connection establishment and connection release Node A asks for a connection with a set asynchronous balanced mode (SABM) frame; node B gives a positive response with an unnumbered acknowledgment (VA) frame After these two exchanges, data can be transferred between the two nodes (not shown in the figure) After data transfer, node A sends a DISC (disconnect) frame to release the connection; it is confirmed by node B responding with a VA (unnumbered acknowledgment)
Figure 1129 Example of connection and disconnection
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Example 1110: Piggybacking without Error
Figure 1130 shows an exchange using piggybacking Node A begins the exchange of information with an I-frame numbered 0 followed by another I-frame numbered 1 Node B piggybacks its acknowledgment of both frames onto an I-frame of its own Node B's first I-frame is also numbered 0 [N(S) field] and contains a 2 in its N(R) field, acknowledging the receipt of Ns frames 1 and 0 and indicating that it expects frame 2 to arrive next Node B transmits its second and third I-frames (numbered 1 and 2) before accepting further frames from node A Its N(R) information, therefore, has not changed: B frames 1 and 2 indicate that node B is still expecting Ns frame 2 to arrive next Node A has sent all its data Therefore, it cannot piggyback an acknowledgment onto an I-frame and sends an S-frame instead The RR code indicates that A is still ready to receive The number 3 in the N(R) field tells B that frames 0, 1, and 2 have all been accepted and that A is now expecting frame number 3
DATA LINK CONTROL
Example ofpiggybacking without error
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Example 1111: Piggybacking with Error
Figure 1131 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 REI frame for frame 1 Note that the protocol being used is Go-Back-N with the special use of an REI frame as a NAK frame The NAK frame does two things here: It confirms the receipt of frame and declares that frame 1 and any following frames must be resent Node B, after receiving the REI frame, resends frames 1 and 2 Node A acknowledges the receipt by sending an RR frame (ACK) with acknowledgment number 3
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) Today, millions of Internet users who need to connect their home computers to the server of an Internet service provider use PPP The majority of these users have a traditional modem; they are connected to the Internet through a telephone line, which provides the services of the physical layer But to control and
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Example ofpiggybacking with error
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manage the transfer of data, there is a need for a point-to-point protocol at the data link layer PPP is by far the most common PPP provides several services: 1 PPP defines the format of the frame to be exchanged between devices 2 PPP defines how two devices can negotiate the establishment of the link and the exchange of data 3 PPP defines how network layer data are encapsulated in the data link frame 4 PPP defines how two devices can authenticate each other 5 PPP provides multiple network layer services supporting a variety of network layer protocols 6 PPP provides connections over multiple links 7 PPP provides network address configuration This is particularly useful when a home user needs a temporary network address to connect to the Internet
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