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Chapter 6 Overview

Chapter 6 Overview. Max Tottenham. Communication methods 6.1. Data transmission : - Serial vs Parallel vs Async Bit rate/Baud rate Bandwidth / Latency Parity Handshaking protocols Baseband/Broadband. Key Terms 6.1. Data transmission: Movement of data from one place to another

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Chapter 6 Overview

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  1. Chapter 6 Overview Max Tottenham

  2. Communication methods 6.1 • Data transmission : - Serial vs Parallel vs Async • Bit rate/Baud rate • Bandwidth / Latency • Parity • Handshaking protocols • Baseband/Broadband

  3. 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.

  4. Networks 6.2 • Lans/Wans • Topology : - Lan topologies • Internetworking • Network adapters • Segmentation • Bus vs star • P2p vs server • Web 2.0 • Wifi • Routers /gateways

  5. 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

  6. Server Side Scripting • CGI • SSS • Writing Scripts • Accessing data from DBMS using SSS

  7. Internet Security • Types of issues • Firewalls • Encryption • Digital Signatures • Virus detection • Computer security procedures

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