Data Transmission
data transfers on one wire one bit at time
serial
contains header, payload and trailer
what is a packet
the number of bits used to represent the color information of a single pixel
what is colour depth
temporary storage of items in a basket, stored in a web browser
what is a session cookie
32 bit character set which can represent more world languages
what is unicode
data transfers in one direction only
simplex
what is packet switching
the number of bits of information used to measure the height, amplitude or volume of each individual audio snapshot
what is sample depth
to securely transfer data between a web browser and a website by encrypting the communication. may use Transport Layer Security (TLS) or Secure Socket Layer (SSL)
what is HTTPS
the number of pixels in length and height of an image or a screen
what is resolution
forwards packets down the most efficient route
router
Voice over Internet Protocol, data download and upload use this
full duplex transmission
uses the same key to encrypt and decrypt cipher text to plain text
symmetric key encryption
text-based address for a web page; it can contain the protocol, the domain name and the web page/file name
what is a URL
reducing file size by permanently removing data, such as lowering sample rate or resolution, colour depth of image resolution
what is lossy compression
used to reconstruct the packet into the correct order when the last packet arrives
packet number
what is a packet header
uses serial data transmission, a common standard and universally used, supporting different transmission speeds and also charging whilst connected where it automatically detects and installs drivers
what is USB
Functions include: – storing bookmarks and favourites – recording user history – allowing use of multiple tabs – storing cookies – providing navigation tools – providing an address bar
What are functions of a web browser
a specialized computer system built inside a larger mechanical or electrical device to perform one specific job
what is an embedded system
data transfers along multiple wires multiple bits at a time in both directions simultaneously
parallel full duplex
data transfers along multiple wires multiple bits at a time in both directions but not at the same time
parallel half-duplex
the maximum amount of data that can be transmitted over a network or internet connection in a specified amount of time
what is bandwidth
one is the infrastucture, the physical devices and cables which allow for the collection of websites. The other are the specific websites and web pages accessed on this infrastructure
what is the difference between the internet and the world wide web
used when retrieving web pages, converting a URL into a specific IP address so a web server can web page can be requested from a web server
what is a domain name server (DNS)