Networks

How networks work and communicate, how to detect errors, data transmission, and more.

Universal Serial Bus (USB)

USB is a plug-and-play interface that allows a computer to connect with components and other devices.  USB-connected devices cover a wide range of categories, from keyboards to music players and flash drives. USBs are also used to transmit power to certain devices, such as smartphones and tablets, as well as to charge their batteries.  USB version 1.0 …

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Simplex, Half Duplex, Full Duplex

There are three modes of transmission, namely: simplex, half duplex, and full duplex.  The transmission mode defines the direction of signal flow between two connected devices. The primary difference between three modes of transmission is that in a simplex mode of transmission the communication is unidirectional, or one-way; whereas in the half duplex mode of transmission the communication is …

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Serial & Parallel Data Transmission

There are two ways to transfer data between computers: Serial Transmission and Parallel Transmission. Serial Transmission Data is sent bit by bit from one computer to another in two directions.  Each bit has a clock pulse rate.  Eight bits are transmitted at a time, with a start and stop bit known as a parity bit, …

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Data Transmission

Data transmission is a means of transmitting digital or analog data over a communication medium to one or more devices.  It allows the transmission and communication of devices in different environments: point-to-point, point-to-multipoint, or multipoint-to-multipoint. Data transmission can either be analog or digital, but is mostly earmarked for sending and receiving digital data.  As such, …

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Computer Networks

Candidates should be able to: explain the advantages of networking stand-alone computers into a local area network describe the hardware needed to connect stand-alone computers into a local area network, including hub/switches, wireless access points explain the different roles of computers in a client-server and a peer-to-peer network describe, using diagrams or otherwise, the ring, …

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Error Detection

Error An error is a situation that occurs the output data does not equate with the input data.  During communication, digital indicators encounter noise that can possibly initiate errors in the binary bits moving from one system to another.  This means a 0 bit may be altered to 1, or a 1 bit may be …

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The Internet

Candidates should be able to: describe the nature of the Internet as a worldwide collection of computer networks describe the hardware needed to connect to the Internet including modems, routers etc explain the need for IP addressing of resources on the Internet and how this can be facilitated by the role of DNS servers explain …

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