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om nh Vi en Zo ne C Chapter Si The Data Link Layer SinhVienZone.com https://fb.com/sinhvienzonevn Data Link Layer Design Issues nh Vi en Zo ne C om Services Provided to the Network Layer Framing Error Control Flow Control Si • • • • SinhVienZone.com https://fb.com/sinhvienzonevn om Functions of the Data Link Layer • • • nh Vi en Slow receivers not swamped by fast senders Si • Zo ne C Provide service interface to the network layer Dealing with transmission errors Regulating data flow SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Functions of the Data Link Layer (2) Relationship between packets and frames SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Services Provided to Network Layer (a) Virtual communication (b) Actual communication SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Services Provided to Network Layer (2) Placement of the data link protocol SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Framing A character stream (a) Without errors (b) With one error SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Framing (2) (a) A frame delimited by flag bytes (b) Four examples of byte sequences before and after stuffing SinhVienZone.com https://fb.com/sinhvienzonevn nh Vi en Zo ne C om Framing (3) Si Bit stuffing (a) The original data (b) The data as they appear on the line (c) The data as they are stored in receiver’s memory after destuffing SinhVienZone.com https://fb.com/sinhvienzonevn om Error Detection and Correction Si nh Vi en Zo ne C • Error-Correcting Codes • Error-Detecting Codes 10 SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om A Sliding Window Protocol Using Selective Repeat (2) SinhVienZone.com Continued https://fb.com/sinhvienzonevn 32 Si nh Vi en Zo ne C om A Sliding Window Protocol Using Selective Repeat (3) SinhVienZone.com Continued https://fb.com/sinhvienzonevn 33 Si nh Vi en Zo ne C om A Sliding Window Protocol Using Selective Repeat (4) 34 SinhVienZone.com https://fb.com/sinhvienzonevn nh Vi en Zo ne C om A Sliding Window Protocol Using Selective Repeat (5) Si (a) Initial situation with a window size seven (b) After seven frames sent and received, but not acknowledged (c) Initial situation with a window size of four (d) After four frames sent and received, but not acknowledged 35 SinhVienZone.com https://fb.com/sinhvienzonevn om Protocol Verification Si nh Vi en Zo ne C • Finite State Machined Models • Petri Net Models 36 SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Finite State Machined Models (a) State diagram for protocol (b) Transmissions 37 SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Petri Net Models A Petri net with two places and two transitions 38 SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Petri Net Models (2) A Petri net model for protocol SinhVienZone.com https://fb.com/sinhvienzonevn 39 .C om Example Data Link Protocols Si nh Vi en Zo ne • HDLC – High-Level Data Link Control • The Data Link Layer in the Internet 40 SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om High-Level Data Link Control Frame format for bit-oriented protocols 41 SinhVienZone.com https://fb.com/sinhvienzonevn nh Vi en Zo ne C om High-Level Data Link Control (2) Si Control field of (a) An information frame (b) A supervisory frame (c) An unnumbered frame 42 SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om The Data Link Layer in the Internet A home personal computer acting as an internet host 43 SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om PPP – Point to Point Protocol The PPP full frame format for unnumbered mode operation 44 SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om PPP – Point to Point Protocol (2) A simplified phase diagram for bring a line up and down SinhVienZone.com https://fb.com/sinhvienzonevn 45 Si nh Vi en Zo ne C om PPP – Point to Point Protocol (3) The LCP frame types 46 SinhVienZone.com https://fb.com/sinhvienzonevn ... https://fb.com/sinhvienzonevn nh Vi en Zo ne C om Framing (3) Si Bit stuffing (a) The original data (b) The data as they appear on the line (c) The data as they are stored in receiver’s memory after destuffing SinhVienZone.com... Functions of the Data Link Layer • • • nh Vi en Slow receivers not swamped by fast senders Si • Zo ne C Provide service interface to the network layer Dealing with transmission errors Regulating data. .. om Functions of the Data Link Layer (2) Relationship between packets and frames SinhVienZone.com https://fb.com/sinhvienzonevn Si nh Vi en Zo ne C om Services Provided to Network Layer (a) Virtual
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