Unit1_BasicConcepts - Unit 1 Basic Concepts After studying...

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Basic Concepts 1-1 Unit 1 Basic Concepts After studying this unit, you will be able to recognize the major components of computer networks, explain how these components work together to achieve data communications.
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Basic Concepts 1-2 Outline of Unit 1 ± 1.1 Computer Network and its Components ± 1.2 Circuit Switching vs. Packet Switching ± 1.3 Packet loss and delay ± 1.4 Network Protocols and Layering ± 1.5 A Simple Distributed Algorithm Problem
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Basic Concepts 1-3 Unit 1.1 Computer Network and its Components
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Basic Concepts 1-4 What is a Computer Network? ± Computers connected together. ± Example: ± What if there are more than two computers?
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Basic Concepts 1-5 Network Topology To fully connect n terminals, how many links are needed? A number of terminals connected with each other.
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Basic Concepts 1-6 Bus Topology ± Commonly used in traditional LANs
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Basic Concepts 1-7 Ring Topology ± Commonly used in traditional LANs
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Basic Concepts 1-8 Star Topology Switch / Router
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Basic Concepts 1-9 A 2-Tier Network A larger network can be constructed recursively.
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Basic Concepts 1-10 Classification of Networks ± Networks can be classified by their scales .
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Basic Concepts 1-11 Personal Area Network (PAN) ± Communication among computer devices ² Desktop computer, mobile phones, PDA, digital camera, MP3 player, etc. ± The devices may or may not belong to the same person. ± Some PAN technologies: ² USB, FireWire ² Wireless technologies: IrDA, Bluetooth, UltraWideBand (UWB), ZigBee
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Basic Concepts 1-12 Local Area Network (LAN) ± Covers a small physical area ² e.g. home, office, campus, airport, etc. ± Higher data rate (relative to WAN) ² Traditional LAN: 10 Mbps to 100 Mbps • 1 Mbps = 1,000 Kbps = 1,000,000 bps ² Nowadays: up to 100 Gbps • 1 Gbps = 1,000 Mbps = 1,000,000,000 bps ± Two common technologies currently in use: ² Wired LAN: Ethernet over twisted pair cabling ² Wireless LAN: Wi-Fi
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Basic Concepts 1-13 Metropolitan Area Network (MAN) ± Covers a city, a large campus, or several blocks of buildings ± Can be used to interconnect a number of LANs. ± Example: Cable TV network (covers a city) ± Some MAN technologies: ² Asynchronous Transfer Mode (ATM) ² Distributed Queue Distributed Bus (DQDB) ² WiMAX
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Basic Concepts 1-14 Wide Area Network (WAN) ± Spans a large geographical area, often a country or continent. ± WANs are used to connect LANs and other types of networks together. ± Many WANs are built for one particular organization and are private. ± Other WANs are built by Internet Service Providers (ISP) to connect an organization’s LAN to the Internet. ± Some WAN Technologies: ² Frame Relay ² ATM
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Basic Concepts 1-15 Example: A Small LAN ± A small LAN typically consists of: ² A number of stations • e.g. PCs running OS such as Windows XP ² One or more servers • more powerful PCs having shared resources • File server, printer server, network-attached storage (NAS) • usually run OSs that are specially designed for servers, e.g. Windows NT, Unix.
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This note was uploaded on 05/01/2011 for the course ELECTRICAL EE3015 taught by Professor Albertsun during the Spring '11 term at City University of Hong Kong.

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Unit1_BasicConcepts - Unit 1 Basic Concepts After studying...

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