cnlec01 - Introductions Computer Networking Lecture 01 HKU...

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Introductions Computer Networking Lecture 01 HKU SPACE Community College January 14, 2011 HKU SPACE CC CN Lecture 01 1/36
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Outline What is a Computer Network? Basic Requirements of Building a Computer Network Connectivity Cost-Effective Resource Sharing Support for Common Services Performance Network Architecture Layered Architecture The Internet Architecture The OSI Model HKU SPACE CC CN Lecture 01 2/36
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What is a Computer Network? There are many networks? (Mobile) Telephone and pager networks Satellite and radio networks Cable TV networks Traffic networks The Internet A computer network is a set of connected end systems (general purposed programmable hardware) to communicate with one another. One of the main characteristics of today’s computer networks is generality . Means that today’s computer networks can carry different kinds of data in many different environments and supports a wide, and ever growing, range of applications. Some properties of a computer network: size , topology , speed , physical media , and protocol . HKU SPACE CC CN Lecture 01 3/36
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Classifications of Computer Networks By size Interconnection networks: connecting multiple processors. System/Storage area networks (SAN): connecting processors to storage servers. Local area networks (LAN): connecting a limited number of hosts in a close proximity. Metropolitan area networks (MAN): connecting a limited number of LANs in a close proximity. Wide area networks (WAN): connecting hosts situated anywhere. By speed Dial-up networks (Kbps) High-speed networks (Mbps) Gigabit networks (Gbps) HKU SPACE CC CN Lecture 01 4/36
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Classifications of Computer Networks (Cont’d) By mobility Fixed networks Wireless networks Mobile networks Personal area networks (PAN) Ubiquitous networks By software Novell NetWare (IPX) Apple AppleTalk Microsoft network (NetBIOS) TCP/IP By service Data Telecommunications Convergence of services HKU SPACE CC CN Lecture 01 5/36
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Basic Requirements of Building a Computer Network If you are going to design and build a network from sketch, what are the issues that you are going to consider? Connectivity Cost-effective resource sharing Support for common services Performance Others Security Accounting for resources Economical factors For the Internet, two important design goals are to interconnect existing networks (the most fundamental one) and to survive. HKU SPACE CC CN Lecture 01 6/36
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A network must provide connectivity among a set of end systems, or in other words, a computer must somehow connect to another computer. Network connectivity occurs at different levels, at host level: machine to machine; at application level: process to process. In general, there are two kinds of connection methods: direct connections and indirect connections . HKU SPACE CC
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cnlec01 - Introductions Computer Networking Lecture 01 HKU...

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