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信息通信网络概论课件:Chapter5-DataLinkLayer-3.ppt
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信息通信网络概论课件:Chapter5-DataLinkLayer-3.ppt
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Chapter 5
Peer-to-Peer Protocols
and Data Link Layer
PART II: Data Link Controls
Framing
Point-to-Point Protocol
High-Level Data Link Control
Data Link Protocols
Data Links Services
Framing
Error control
Flow control
Multiplexing
Link Maintenance
Security: Authentication
&Encryption
Examples
PPP
HDLC
Ethernet LAN
IEEE 802.11 (Wi Fi) LAN
Directly connected, wire-like
Losses & errors, but no out-of-sequence
frames
Applications: Direct Links; LANs;
Connections across WANs
Chapter 5
Peer-to-Peer Protocols
and Data Link Layer
Part II: Framing
Framing
Mapping stream of
physical layer bits into
frames
Mapping frames into bit
stream
Frame boundaries can be
determined using:
Character Counts
Control Characters
Flags
CRC Checks
Character-Oriented Framing
Frames consist of integer number of bytes
Asynchronous transmission systems using ASCII to transmit printable characters
Octets with HEX value <20 are nonprintable
Special 8-bit patterns used as control characters
STX (start of text) = 0x02; ETX (end of text) = 0x03;
Byte used to carry non-printable characters in frame
DLE (data link escape) = 0x10
DLE STX (DLE ETX) used to indicate beginning (end) of frame
Insert extra DLE in front of occurrence of DLE STX (DLE ETX) in frame
All DLEs occur in pairs except at frame boundaries
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