communications

Created by: nitinn889
Created on: 05-02-21 10:28

types of data transmission

seriel- bit by bit over a single wire or channel
parallel- several bits are transmitted simultaneouslly over multiple channels

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Parity check

A parity bit is allocated with the byte of data. Can be odd or even parity

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disadvantage of parity

Even number of bits are transposed

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Automatic Repeat Request(ARQ)

uses acknowledgment and timeout.
Acknowledgement is a message sent by the receiver that data has been received correctly.
timeout is the time allowed to elapse before an acknowledgment is made.

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Checksum

Data is sent along with a checksum value calculated. The checksum is re-calculated at the other end.

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Echo-check

when data is sent to another device, the data is also resent back to the user. The sender compares the packets to sea if any change has occured.

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HTML Structure and presentation

Structure is the semantics and the structural markup; the layout of the webpage . Eg: location of an image next to a text.
Presentation is the physical appearance and the style of the text, and the formatting Eg: color of a text

Together they dictate th

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HTTPS(Hyper Text Transfer protocol)

governs the transmission of data over the internet. Can be recognized by the padlock symbol or by viewing the SSL certificate.

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Web Browser

Software that allows user to display Web page on their screen. It interprets and translates the HTML code.

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parts of a Web Address

http://www.Amazon.com.nz/view_order

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Dowloading

retrieving information from server

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client

computer with access to server.

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Web Server

A software and a hardware that uses HTTP and other protocols to respond to client requests made over the World Wide Web.

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Ip Address

An Ip address is an unique address that uniquely identifies a device on internet or a local network.

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Mac address

An unique identifier assigned to a network interface controller for use as a network address in communications with a network segment.

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Other cards in this set

Card 2

Front

A parity bit is allocated with the byte of data. Can be odd or even parity

Back

Parity check

Card 3

Front

Even number of bits are transposed

Back

Card 4

Front

uses acknowledgment and timeout.
Acknowledgement is a message sent by the receiver that data has been received correctly.
timeout is the time allowed to elapse before an acknowledgment is made.

Back

Card 5

Front

Data is sent along with a checksum value calculated. The checksum is re-calculated at the other end.

Back

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communications