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Basic details about computer networks and layers of reference models
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computer networks layers
1.
© Oxford University
Press 2011 Computer NetworksComputer Networks Bhushan Trivedi, Director, MCA Programme, at the GLS Institute of Computer Technology, Ahmadabad
2.
© Oxford University
Press 2011 Chapter 1Chapter 1 Introduction to computerIntroduction to computer networksnetworks
3.
© Oxford University
Press 2011 Questions to be answered • How is a file downloaded • How do emails reach their intended recipients? • How does a wired and a wireless connection work the same? • How is receipt of new data (for example a new antivirus update), handled and by whom?
4.
© Oxford University
Press 2011 Layering Example
5.
© Oxford University
Press 2011 Advantages of layers • Reducing the complexity • Division of Work • Standard Interfacing between Components • Replacing a component is easy • Independence in Protocol design
6.
© Oxford University
Press 2011 Disadvantages of layers • Reduced Speed and Performance • Increased Memory usage • Sensor Networks Node
7.
© Oxford University
Press 2011 Layers for OSI and TCP/IP
8.
© Oxford University
Press 2011 Connection Oriented vs Connectionless • Connection establishment • Complete line occupied or not • Multiplexing • Robustness of the connection • Cost of the connection • Quality of service • Order of delivery
9.
© Oxford University
Press 2011 Example CO vs CL
10.
© Oxford University
Press 2011 OSI and TCP IP difference • OSI has seven layers, TCP/IP has five layers. • The OSI was connection-oriented, TCP/IP model was connectionless • The TCP/IP provided a choice (TCP or UDP) to the customers. • TCP/IP describes an existing set of protocols The OSI model was more general
11.
© Oxford University
Press 2011 OSI and TCP IP difference • OSI model distinguishes between an interface and a protocol TCP IP does not • The OSI model clearly mentions the physical and data link layers. • The Internet provides both, connection oriented service over connectionless transfer and connectionless service over connectionless transfers,
12.
© Oxford University
Press 2011 The Physical Layer
13.
© Oxford University
Press 2011 The Data Link Layer
14.
© Oxford University
Press 2011 The Network Layer
15.
© Oxford University
Press 2011 Network Layer Functioning
16.
© Oxford University
Press 2011 Routing at Network Layer
17.
© Oxford University
Press 2011 Extracting Prefix
18.
© Oxford University
Press 2011 Routing between different networks
19.
© Oxford University
Press 2011 Transport layer and reliability by retransmitting
20.
© Oxford University
Press 2011 Application Layer
21.
© Oxford University
Press 2011 Other • Distributed Systems – WWW • Peer to peer networks • Client server networks
22.
© Oxford University
Press 2011 X.25
23.
© Oxford University
Press 2011 DTE routing
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