Sami S.Al-Wakeel 1 CHAPTER 1 INTRODUCTION. Sami S.Al-Wakeel 2 NETWORK Definition: A Group of...
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Transcript of Sami S.Al-Wakeel 1 CHAPTER 1 INTRODUCTION. Sami S.Al-Wakeel 2 NETWORK Definition: A Group of...
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NETWORK
Definition:
A Group of interconnected nodes that exchange information and share resources through communication channels
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TYPES OF NETWORKS
Telecommunication Network Computer Network Transmission Network Control Network
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Telecommunication Network
* Designed primarily for human communication
Example– Telephone Network– TV Network– Pager Network
Nodes:
Example– Telecommunication Devices– Telephone set– Pager
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Transmission Network
Designed primarily for data transport and Routing & Transmission
Examples– Satellite Networks– ATM Networks– SONET Networks
Processing Devices Examples
- Switches - Routers
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Control Network
Designed primarily for Sensing and Measurement and Control Examples
– Air Defence Network– Air Conditioning Network– Factory Network
• Sensors and Control Devices– Temperature Sensors– Robots
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Computer Networks
An interconnected Autonomous (self working/intelligent) Computers designed for Computer Communication through Communication channel for data exchange and resources sharing
Examples– LAN– Internet– Banks Networks
Devices: Autonomous Computers
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Goals of Computer network
Resource sharing (Software and Hardware).
Providing high reliability by having alternative resources.
Saving money.
Access to remote information.
Person-to-person communication.
Interactive entertainment.
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ADVANTAGES OF COMUTER NETWORKS
Share Resources Provides Communication system to exchange &
Broadcast information Increases Reliability Allow remote access to information sources Increase processing power for problem solving Allow new Application Allow Collaborative work
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DISADVANTAGES OF COMPUTER NETWORKS
Loss of privacy Computer network Crimes Attack to social values
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Uses of Computer Networks
• Business Applications• Home Applications• Social Applications• Scientific Applications
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Social and Scientific Applications of Networks
Corporate Work Distributed Data Simulation and Research
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Home Network Applications
Access to remote information Person-to-person
communication Interactive entertainment
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Business Applications
Electronic Commerce Electronic Administration Co-operative Work Electronic Government Office Automation E-Mail
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CLASSIFICATION OF COMPUTER NETWORKS
Classification Based on Geography & Ownership- Personal Area Networks (PAN)
- Local Area Networks (LAN) - Metropolitan Area Networks( MAN) - Wide Area Networks (WAN)
- Internet
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Classification Of Computer Networks-2
Classification Based on Technology and Application- Wireless Networks- Home Networks
- Storage Area Networks (SAN) - Intranet and Extranet - Broadcast Networks
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Local Area Networks
Definition: A Computer Network owned by a private sector or by a individual extended within a building or a campus up to a few kilometers in size
PC
PC
PCPC
PC
PCPC
PC
PC PC PC PC PC PC
Ring (IBM Token Ring)
Bus (EthernetTM)
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Local Area Networks
LANs often use a transmission technology consisting of a single cable to which all the machines are attached.
LANs run at speeds of 10 to 1000 Mbps. LAN Topology can be A broadcast or point to point
Various topologies are possible for broadcast LANs such as a bus (EthernetTM) and a ring (IBM Token Ring).
Point to Point LAN is built using point-to-point lines. Individual lines connect a specific machine with another specific machine.
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Metropolitan Area Networks
Definition: A computer Network that extend within a city and owned by a Corporation or by Public Sector
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Wide Area Network
Definition: A connection of Computer hosts and LAN’s through the subnet that extend within a country (or continents ) and owned by Public Sector
Examples : PSDN , X.25 , Frame Relay Application
- Long Distance data transport
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Wide Area Networks
WAN interconnects hosts and LANs through its subnet and routers
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Integrated Service digital Networks
Definition : A telecommunication digital network that integrates many media, networks and applications
ISDN
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Internet Definition: A networks that extend world wide and connects all types of
computer networks
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Home Network
Definition: A network used for Home Applications Devices:
- Computers (desktop PC, PDA, shared connected home peripherals
- Entertainment Applications:- TV, DVD, VCR, camera, stereo, MP3
- Telecommunication Devices - telephone, cell phone, intercom, fax
- Appliances - microwave, fridge, clock, furnace, air conditioners
-Telemetry Applications-utility meter, burglar alarm
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Wireless Networks
Definition: A Computer Network that interconnect computers by wireless channel
Examples of Wireless Networking:- System interconnection- Wireless LANs and
PANs(Bluetooth)- Wireless WANs
- Point to Point links