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Chapter 6 Overview
Max Tottenham
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Communication methods 6.1
Data transmission : - Serial vs Parallel vs Async
Bit rate/Baud rate Bandwidth / Latency Parity Handshaking protocols Baseband/Broadband
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Key Terms 6.1
Data transmission: Movement of data from one place to another Serial Data Transmission: Bits are sent one at at time using a single wire Parrallel transmission: groups of bits are send using multiple wires Baud rate: Number of times the signal can change on a wire/line per second. Bit rate: Number of bits transmitted per second. Bandwidth: the range of frequencies a medium can transmit Handshaking protocol: sending and rcv dev’s exachnge sigs to estb that the
rec dev is cntd and rdy 2 recv. Snd dev co-ords sending of data informing recvr that it is sending. Recv indicates it has recvd data and is ready to recv again
Baseband: system uses single data channel in which the hwole bandwidth of the transmission medium is deditcated to one data channel at a time.
Broadband: a multiple data channel system in which bandwidth of the tranmission medium carries several streams of data at the same time.
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Networks 6.2
Lans/Wans Topology : - Lan topologies Internetworking Network adapters Segmentation Bus vs star P2p vs server Web 2.0 Wifi Routers /gateways
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Key Terms 6.2
LAN: linked computers in close proximity Stand alone computer: a computer that is not
networked, it requires ts own printer and other peripherals plus its on installation of application software
Topology: the shape/layout/configuration or structure of the connections that connects devices to the network.
WAN@ a set of links that con
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Server Side Scripting
CGI SSS Writing Scripts Accessing data from DBMS using SSS
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Internet Security
Types of issues Firewalls Encryption Digital Signatures Virus detection Computer security procedures