计算机网络protocol,北邮高级计算机网络课件1-protocol.pdf
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北京郵電大學
Protocol in General
Information Network Center
Beijing University of Posts and
Telecommunications
Sept. 2013
北京郵電大學
Outline
? An overview on protocols
? Well-known protocol stacks
? Protocol mechanisms
? Protocol specification
? Protocol evaluation
? Standards
INC, BUPT
北京郵電大學
What is protocol
? a set of rules to insure the information to be
transferred between communication parties
? [a set of conventions governing the treatment and
especially the formatting of data in an electronic
communications system] defined by Webster.
– /cgi-
bin/dictionary?book=Dictionary&va=protocol
– /ebc/article?tocId=9376028&query=proto
col&ct=
? It could be implemented by hardware or software
INC, BUPT
北京郵電大學
Why using protocol
? Productivity: easy to implement by groups
? Lower cost: network resource sharing
? Compatibility: world-wide reachability
? Connectivity
? Strategic benefits
?
...
INC, BUPT
北京郵電大學
What kind of Protocols are there
? Asynchronous: Byte
– Xon/Xoff, KERMIT, Xmodem serious, ...
? Synchronous: bit/binary
– SDLC, HDLC, BSC, X.25, ISDN, …
? Layered Protocol
– OSI structure 1 ~ 7: phy ~ appl.
– TCP/IP
? Vendor specific / Standard:
– proprietary / de facto
? Computer network / Telecommunication Network
? ... INC, BUPT
總結
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