Computer Networking

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Computer Networking
Computer System Computer Hardware Computer
Software Computer Networking
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Computer System

• Hardware
• Software

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Computer Hardware

• Input devices
• Output devices
• System unit
• CPU
• Memory (RAM)
• Storage
• Networking devices

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Computer Software

• System Program
• Operating System
• Utility program
• Maintained by SA
• Application Program
• Users

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Computer Networks

• Local Area Network (LAN)
• Intranet
• Internet
• Extranet

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Local Area Network

• Two or more computers
• Connected
• cable
• hub/switch
• Small physical area
• home
• office
• small group of buildings
• school
• airport

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Networking Devices

• cable
• hub
• switch
• network interface card (NIC)
• wireless
• bluetooth
• WiFi
• WiMax

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Cables

• Coaxial cable
• Ethernet cable

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Coaxial Cable

• cable TV

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Ethernet Cable

• 4 twisted pairs
• 8 pins plug

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Hub/Switch

• Ports

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Computer NetworkingTopologies

• Bus topology
• Ring topology
• Star topology
• Tree topology

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Bus Topology

• common backbone
• interface connector
• broadcast message

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Ring Topology

• exactly two neighbors
• same direction

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Star Topology

• central connection
• hub/switch

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Tree Topology

• Bus topology
• Star topology

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Internetworking

• Two or more networks
• heterogeneous
• different configurations
• router
• two or more NIC
• gateways

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Extranet

• private network
• internet protocol
• Virtual Private Network (VPN)