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by: Mallie Crist
Mallie Crist
GPA 3.62


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Class Notes
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This 7 page Class Notes was uploaded by Mallie Crist on Monday September 21, 2015. The Class Notes belongs to CSC 3320 at Georgia State University taught by Staff in Fall. Since its upload, it has received 19 views. For similar materials see /class/209896/csc-3320-georgia-state-university in ComputerScienence at Georgia State University.


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Date Created: 09/21/15
Ch 8 Networking Ethernet hardware standard defining cabling signaling and behaviors that allow two or more computers to be connected Each computer contains a Ethernet card a special piece of hardware that has a unique Ethernet address Every computers Ethernet card is connected to the same piece of wire When a computer wishes to send a message to another computer it broadcasts the message along with a destination address Only the Ethernet card whose address matches the destination address accepts the message When a collision occurs two messages sent at the same time both computers wait a random period of time and rebroadcast the message Bridges Special hardware connecting two segments of Ethernet cable serial connection between two groups of computers Routers hooks together two or more networks and automatically routes messages to the proper network Gateways High capacity routers which connect Local Area Networks These are place geographically apart WAN Internet Collection of LANs and WANS working together packet switching messages are split into small packets each of which is routed independently switched through the network specially encoded information in packets allow them to be recombined at the destination internet addresses Internet Protocol IP version 4 addressing is a hardware independent labeling scheme 32 bit address made up of 4 bytes each part is has a value between 0 and 255 IP version 6 scheme 128 bit addresses numerical addresses are not convenient so names are used etchosts file contains namesnumbers for all local host names routing done statically using information in etcroute file or dynamically using etcrouted and etcgated programs which constantly update the routing tables and sharing this with nearby hosts remote shells if a user has accounts on several machines in the network with the same userid they are able to execute commands on other machines without providing a password from tinmancsgsuedu I can execute rsh zeus who if you have a file called rhosts in your home directory with a list of host names full names then this is possible machine equivalence Network related Unix commands User Information users displays a simple list of users on your local host rusers a host displays a list of users on all hosts on the local network who rwho w all describe users logged on in more detail hostname displays your host name finger userld display personal information about users Communicating with other users 70 mesg y l n enables or disables writing to your terminal write userId tty write userId tty writes line by line to the userld s terminal stop using CTRLD talk userId tty interactive writing split screen wall write all Moving Around rlogin host ftp host telnet host rsh host command


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