ch1 tcp.ip 高级计算机网络 （英文版）培训资料.ppt

Chapter 1Introduction(2)
working: A Top Down Approach ,4th edition. Jim Kurose, Keith RossAddison-Wesley, July 2007.
1
Introduction
Learn about the notions of protocol、layer、interface、and architecture.
Learn about the OSI model and the detail functions of each layer.
Learn about the TCP/IP model and the detail functions of each layer.
Requirements:
2
Introduction
Chapter 1: roadmap
some notions : protocol、layer、interface、and architecture
OSI model
TCP/IP model
3
Introduction
Protocol is used in diplomatic originally, is carried out in order to smooth the exchange between countries bound by the provisions of the matter (the Rules)
Definition of Protocol: To be simply, the protocol is the set of rules munication parties must follow.
ponent of Protocol:  grammar、semanteme、synchronization。
About Protocol
4
Introduction
ponents
Grammar: The structure or format of the data and control information.
Semanteme: The control information that should be sent, the action that should be taken and the response that should be feedback.
Synchronization: The detail explain of the sequence of the events.
5
Introduction
Example: Organization of air travel
a series of steps
ticket (purchase)
baggage (check)
gates (load)
runway takeoff
airplane routing
ticket (complain)
baggage (claim)
gates (unload)
runway landing
airplane routing
airplane routing
8
Introduction
ticket (purchase)
baggage (check)
gates (load)
runway (takeoff)
airplane routing
departure
airport
arrival
airport
intermediate air-traffic
control centers
airplane routing
airplane routing
ticket (complain)
baggage (claim
gates (unload)
runway (land)
airplane routing
ticket
baggage
gate
takeoff/landing
airplane routing
Layering of airline functionality
Layers: each layer implements a service
via its own internal-layer actions
relying on services provided by layer below
9
Introduction
Why layering?
Dealing plex systems:
explicit structure allo