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Computer Networks

by: Nick Rowe

Computer Networks CS 42200

Nick Rowe
GPA 3.68


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Class Notes
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This 4 page Class Notes was uploaded by Nick Rowe on Saturday September 19, 2015. The Class Notes belongs to CS 42200 at Purdue University taught by Staff in Fall. Since its upload, it has received 28 views. For similar materials see /class/208083/cs-42200-purdue-university in ComputerScienence at Purdue University.

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Date Created: 09/19/15
Vaibhav Khanna CS422 Notes for 08312004 What is a network Network is a group of interconnected computers Why a network is necessary Resource Sharing 1 Files 2 Printers 3 Databases Communication between applications 1 Email 2 Instant messenger 3 voice over IPNet Phones Remote Execution l Telnet ssh etc Transmission Media Signals are used to send data Signals are variation of energy over time Types of signals energy 1 Electricity 2 Light 3 Radio Waves 4 Sound Media used to transmit signals 1 Copper wire gt Good conductor hard and exible 2 Coaxial cable for high freq and is shielded Twisted pair gt handles less bandwidth than coaxial noise cancels out because of twists Optical Fiber a Not susceptible to electromagnetic noise like copper b Long distances c Difficult to handle and expensive Radio a Also called Radio Frequency RF b No need for wires c RF spectrum is limited d Bandwidth is limited compared to copper wire and optical wire e Power has to be regulated to prevent interference with other networks E 4 V39 2 networks in a 0 speci c area More networks can be used in the same area if power is reduced Propagation Delay Time required for a signal to travel across media Bandwidth Maximum number of times per second that a signal can change bandwidth limits the throughput of a network Types of encoding 1 Analog the signal changes proportionally to the data sent susceptible to noise I I mwaa 1 11 2 Digital the data is encoded as 0 s and 1 s it is easier to differentiate the noise from data The receiver will reconstruct the signal as 0 s and 1 s eornrnunreate eornputers to TTY39s dumb terrnrna1s 7 PCs stru have COMI and COM2 ports Many deyrees routers bndges ete have R5232 pens for ddagnosucs 7 Very srrnple standard 7 Speer es the transrnrssron ofcharacters 7 1t rs called sen quotbeeause1brtrs sent after another e ed unreaudn rs asynchronousquot srnee the reeeryer does notknow when the transrnrtterwru start transrnrssron 1n eontrast m syn h onousquot eornrnunreauon the reeeryerknows when a tr rssron wru start 7 asynchronous eornrnunreauon the senderhas to add a spema1quot sequence of brts to the reeewer to tell that a byte wru be transrnrtted R5232 uses 15 7gt 0 715 7s A start brt and a stop brt are reqmred 7 ernrtedto 750 feet When xdle the level rs a1ways 715V 7 Ituses a start brtquot to srgna1 start Stan bu 0 Stop bu 15 opuona 10110100 Sender and Reeerver ree on 7 Duration of each bu Baud Rate 7 Number of bus per character Typical Sgeeds 9 s Kbps14 4 Kbps 28 8 Kbps 56 Kbps Disagreement between transmitter and reeerver results m Framrrrg Errorquot Wxth R5232 you can have V lwa rHalfduplex r 2 way 7 Full duplex HalfDquex You can reeerve andtransmxt as long as r rs not atthe same time Full DuEl ex Srmulcaneous transmit and reeerve


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