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Introduction 
Network 
Source Destination
Computer Network? 
o “interconnected collection of autonomous 
computers” 
o What is the Internet? 
– “network of networks” 
– “collection of networks interconnected by routers” 
– “a communication medium used by millions” 
– Email, chat, Web “surfing”, streaming media 
o Internet ¹ 
Web 
oDistributed system
The Big Picture of Networks
Why network? 
Before networks: 
– One large computer (mainframe) used for all 
processing in businesses, universities, etc. 
Smaller, cheaper computers… 
– Personal computers or workstations on desktops 
– Interconnecting many smaller computers is 
advantageous! Why?
Why network? 
Resource sharing! 
– Hardware: printers, disks, terminals, etc. 
– Software: text processors, compilers, etc. 
– Data. 
Robustness 
– Fault tolerance through redundancy 
Load balancing 
– Processing and data can be distributed over the network 
Location independence 
– Users can access their files, etc. from anywhere in the 
network
Problems? 
Security! 
 It’s much easier to protect centralized resources than 
when they are distributed. 
 Network itself as the target..
Applications 
o WWW 
o Instant Messaging (Internet chat, text messaging 
on cellular phones) 
o Peer-to-Peer 
o Internet Phone 
o Video-on-demand 
o Distributed Games 
o Remote Login (SSH client, Telnet) 
o File Transfer
Applications 
• Business Applications 
• Home Applications 
• Mobile Users 
• Social Issues
Business Applications of Networks 
A network with two clients and one server.
Business Applications of Networks (2) 
The client-server model involves requests and replies.
Home Network Applications 
• Access to remote information 
• Person-to-person communication 
• Interactive entertainment 
• Electronic commerce
Home Network Applications (2) 
In peer-to-peer system there are no fixed clients and servers.
Home Network Applications (3) 
Some forms of e-commerce.
Mobile Network Users 
Combinations of wireless networks and mobile computing.
Major Trends in Computing
The Wider Agenda 
year 
log (people per computer) 
Number Crunching 
Data Storage 
Productivity 
Interactive 
Streaming 
Information 
to/from Physical 
World 
Mainframe 
Minicomputer 
Workstation 
PC 
Laptop 
PDA
Various Rates of Improvement
Networking Scenario: Present 
Networks today 
Routers 
Web servers 
Clients
Networking Scenario: Future 
Routers 
Clients 
Web servers 
Audio Video 
Sensors 
Wireless Devices 
Mobile users
Computers of the Future 
Computers are integrated 
– small, cheap, portable, embedded 
Technology is in the background 
– computer are aware of their environment and adapt (“location awareness”) 
– computer recognize the location of the user and react appropriately (e.g., call 
forwarding, fax forwarding, “context awareness”) 
Advances in technology 
– more computing power in smaller devices 
– flat, lightweight displays with low power consumption 
– new user interfaces due to small dimensions 
– more bandwidth 
– multiple wireless interfaces: wireless LANs, wireless WANs, regional wireless 
telecommunication networks etc. (“overlay networks”)
Broadcast Networks 
Types of transmission technology 
• Broadcast links 
• Point-to-point links
Broadcast Networks (2) 
Classification of interconnected processors by scale.
Local Area Networks 
Two broadcast networks 
(a) Bus 
(b) Ring
Metropolitan Area Networks 
A metropolitan area network based on cable TV.
Wide Area Networks 
Relation between hosts on LANs and the subnet.
Wide Area Networks (2) 
A stream of packets from sender to receiver.
Wireless Networks 
Categories of wireless networks: 
• System interconnection 
• Wireless LANs 
• Wireless WANs
Wireless Networks (2) 
(a) Bluetooth configuration 
(b) Wireless LAN
Wireless Networks (3) 
(a) Individual mobile computers 
(b) A flying LAN
Home Network Categories 
• Computers (desktop PC, PDA, shared peripherals 
• Entertainment (TV, DVD, VCR, camera, stereo, MP3) 
• Telecomm (telephone, cell phone, intercom, fax) 
• Appliances (microwave, fridge, clock, furnace, airco) 
• Telemetry (utility meter, burglar alarm, babycam).
Architecture of the Internet 
Overview of the Internet.
Ethernet 
Architecture of the original Ethernet.
Wireless LANs 
(a) Wireless networking with a base station. 
(b) Ad hoc networking.
Wireless LANs (2) 
The range of a single radio may not cover the entire system.
Wireless LANs (3) 
A multicell 802.11 network.
IEEE 802 Standards 
The 802 working groups. The important ones are 
marked with *. The ones marked with  are 
hibernating. The one marked with † gave up.

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sunil patel

  • 2. Computer Network? o “interconnected collection of autonomous computers” o What is the Internet? – “network of networks” – “collection of networks interconnected by routers” – “a communication medium used by millions” – Email, chat, Web “surfing”, streaming media o Internet ¹ Web oDistributed system
  • 3. The Big Picture of Networks
  • 4. Why network? Before networks: – One large computer (mainframe) used for all processing in businesses, universities, etc. Smaller, cheaper computers… – Personal computers or workstations on desktops – Interconnecting many smaller computers is advantageous! Why?
  • 5. Why network? Resource sharing! – Hardware: printers, disks, terminals, etc. – Software: text processors, compilers, etc. – Data. Robustness – Fault tolerance through redundancy Load balancing – Processing and data can be distributed over the network Location independence – Users can access their files, etc. from anywhere in the network
  • 6. Problems? Security!  It’s much easier to protect centralized resources than when they are distributed.  Network itself as the target..
  • 7. Applications o WWW o Instant Messaging (Internet chat, text messaging on cellular phones) o Peer-to-Peer o Internet Phone o Video-on-demand o Distributed Games o Remote Login (SSH client, Telnet) o File Transfer
  • 8. Applications • Business Applications • Home Applications • Mobile Users • Social Issues
  • 9. Business Applications of Networks A network with two clients and one server.
  • 10. Business Applications of Networks (2) The client-server model involves requests and replies.
  • 11. Home Network Applications • Access to remote information • Person-to-person communication • Interactive entertainment • Electronic commerce
  • 12. Home Network Applications (2) In peer-to-peer system there are no fixed clients and servers.
  • 13. Home Network Applications (3) Some forms of e-commerce.
  • 14. Mobile Network Users Combinations of wireless networks and mobile computing.
  • 15. Major Trends in Computing
  • 16. The Wider Agenda year log (people per computer) Number Crunching Data Storage Productivity Interactive Streaming Information to/from Physical World Mainframe Minicomputer Workstation PC Laptop PDA
  • 17. Various Rates of Improvement
  • 18. Networking Scenario: Present Networks today Routers Web servers Clients
  • 19. Networking Scenario: Future Routers Clients Web servers Audio Video Sensors Wireless Devices Mobile users
  • 20. Computers of the Future Computers are integrated – small, cheap, portable, embedded Technology is in the background – computer are aware of their environment and adapt (“location awareness”) – computer recognize the location of the user and react appropriately (e.g., call forwarding, fax forwarding, “context awareness”) Advances in technology – more computing power in smaller devices – flat, lightweight displays with low power consumption – new user interfaces due to small dimensions – more bandwidth – multiple wireless interfaces: wireless LANs, wireless WANs, regional wireless telecommunication networks etc. (“overlay networks”)
  • 21. Broadcast Networks Types of transmission technology • Broadcast links • Point-to-point links
  • 22. Broadcast Networks (2) Classification of interconnected processors by scale.
  • 23. Local Area Networks Two broadcast networks (a) Bus (b) Ring
  • 24. Metropolitan Area Networks A metropolitan area network based on cable TV.
  • 25. Wide Area Networks Relation between hosts on LANs and the subnet.
  • 26. Wide Area Networks (2) A stream of packets from sender to receiver.
  • 27. Wireless Networks Categories of wireless networks: • System interconnection • Wireless LANs • Wireless WANs
  • 28. Wireless Networks (2) (a) Bluetooth configuration (b) Wireless LAN
  • 29. Wireless Networks (3) (a) Individual mobile computers (b) A flying LAN
  • 30. Home Network Categories • Computers (desktop PC, PDA, shared peripherals • Entertainment (TV, DVD, VCR, camera, stereo, MP3) • Telecomm (telephone, cell phone, intercom, fax) • Appliances (microwave, fridge, clock, furnace, airco) • Telemetry (utility meter, burglar alarm, babycam).
  • 31. Architecture of the Internet Overview of the Internet.
  • 32. Ethernet Architecture of the original Ethernet.
  • 33. Wireless LANs (a) Wireless networking with a base station. (b) Ad hoc networking.
  • 34. Wireless LANs (2) The range of a single radio may not cover the entire system.
  • 35. Wireless LANs (3) A multicell 802.11 network.
  • 36. IEEE 802 Standards The 802 working groups. The important ones are marked with *. The ones marked with  are hibernating. The one marked with † gave up.