计算机网络protocol,北邮高级计算机网络课件1-protocol.pdf
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北京邮电大学
Protocol in General
Information Network Center
Beijing University of Posts and
Telecommunications
Sept. 2013
北京邮电大学
Outline
An overview on protocols
Well-known protocol stacks
Protocol mechanisms
Protocol specification
Protocol evaluation
Standards
INC, BUPT
北京邮电大学
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
北京邮电大学
Why using protocol
Productivity: easy to implement by groups
Lower cost: network resource sharing
Compatibility: world-wide reachability
Connectivity
Strategic benefits
...
INC, BUPT
北京邮电大学
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
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