cs1101_09A_lec08 - CS1101 Lec08 - Computer Network Dr....

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Unformatted text preview: CS1101 Lec08 - Computer Network Dr. Jiying Wang Semester A, 2009-10 Computer Science Department City University of Hong Kong CS1101 - Lec08 2 Objectives Describe what is communication and networks List advantages of using a network Discuss the components required for successful communications Identify commonly used data transmission media and communication devices Differentiate between client-server and peer-to-peer networks Define network topology and understand how three topologies differ Name the most widely used network communications standards CS1101 - Lec08 3 For you to practice after class Lec08-Q1: the network at the right belongs to what kind of topology? Could this topology be used for peer-to-peer communication and explain your reason? Lec08-Q2: say your Internet connection's bandwidth is 1Mbps, how many seconds you need to download from the Internet a 4-minute MP3 song with 128Kbs? (assuming 1Kb=10 3 bits and 1Mb=10 6 bits) Lec08-Q3: say you want to watch a real-time streaming video of Formula 1 Race, and this video's frame size is 320x240, frame rate is 30 fps, color depth is 24-bit, video codec compression ratio is 1:60, and audio bit-rate is 64Kbps mono, what is the minimum bandwidth you needs in order to smoothly watch this video? CS1101 - Lec08 4 Networks and Communications Computer network - a group of two or more computers connected together to communicate, exchange data, and share resources in real time Computer communications - the process in which two or more computers or devices transfer data or instructions CS1101 - Lec08 5 Network Enables Simultaneous access to data Data files are shared- Data are stored in a centralized place- All users have access to identical, up-to-date information Software can also be shared- Site licenses Sharing of hardware resources Printers and faxes are common shares Reduces the cost per user Multiple people work together or collaborate Personal communication Email Instant messaging Conferencing- Videoconferencing Voice over IP- Phone communication over network wires Easier data backup Usually in business corporations- Employers keep the data on a shared storage device- The network manager makes regular backups of the data CS1101 - Lec08 6 Components in Communications Sending device Receiving device Communication device Communication device Communication Chanel Components in a communication system Sending device/computer- The device/computer initiates instructions to transmit information Communication device on the sending side- The device converts the information from the sending device into signals carried by the...
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cs1101_09A_lec08 - CS1101 Lec08 - Computer Network Dr....

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