unit 5
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what is the internet
huge public network of computer systems allows for the flow of information between devices made up of computers, servers, switches and routers
what is the world wide web
the collection of resources that exist on the internet
what is a URL(Uniform resource locator)
they are text based addresses for web pages used instead of IP addresses
what are URL’s made of
protocol(HTTP OR HTTPS) domain name web page
what is HTTP(Hypertext transfer protocol)
used to transfer resources uses request codes to send and recieve data and perform other tasks
what are the different request codes
GET, POST, DELETE, PUT
what is the GET request code
request the web server to transmit a specific resource
what is the POST request code
requests to add content or data to a new page
what is the DELETE request code
removes the specified resource form the web server
what is the PUT request code
modifies an existing resource
what is a disadvantage of HTTP
any data sent by this protocol can be read by anyone
what is HTTPS(Hypertext transfer protocol secure)
secure method of sending data done through asymmetric encryption
what are web browsers
allows us to surf the web and view web pages they render HTML web pages and display the content
what are functions of web browsers
storing bookmarks and favorites recording user history allowing use of multiple tabs storing cookies providing navigation tools providing an address bar
what is a DNS server
domain name system keeps record of all domains in existence and maps each of these domains to an IP address
what happens if the DNS server does not have the requested IP address
it will request it from another DNS server
what is a web server
a computer system connected to the internet which stores multiple resources
what do web servers store
web pages images videos audio files interactive content
what happens when the web browser wants a resource
the web browser finds the correct IP address and then request the resource from the web server it will then send the HTML which the browser turns into a readable form for the user
what are cookies and what do they do
small pieces of data that are stored on the users computer system saves personal details tracks user preferences holds items in online shopping stores login details
what are persistent cookies
they remove the need to alter settings on every visit to a website they are stored on the HDD
what are session cookies
stored temporarily on the computer system stored in RAM used to track the user in particular websites
what is digital currency
a form of currency that only exists digitally
what are characteristics of digital currency
decentralised- not controlled by any banks or authorities irreversible and public- they are on a public record and only the person who owns their currency can move it anonymous-sending and recieving digital currency is anonymous limited supply- there is limited supply and circulation of digital currency