Define Internet
Global network of interconnected computers
Define World Wide Web
Part of the internet which users can access using web browser, it is a large collection of web pages
Define Web browser
Software that allows users to access & display web pages on their device screens. They interpret HTML sent from websites
Define URL
piece of code/data you type in an address bar that sends request for the web browser to access the page
URL format
Protocol://website address/path/file name
Protocol
http/https
Website address format
domain host- www
domain name - website name
domain type - .com, .org, .net, .gov
And sometimes country code - .uk, .de, .cy
What does HTTP and HTTPS stand for
Hypertext transfer protocol (secure)
What is hypertext transfer protocol? [2]
set of rules that must be obeyed while tranferring files across internet.
- if security is employed it becomes httpS
Functions of a web browsers (9)
have a home page
store users favourite website / web page as bookmarks
history of websites
allow users to go forwards & backwards on a website
allows many web pages to be open at the same time using tabs
they make use of cookies
they make use of hyperlinks
Data is stored as a cache
provide address bar
Define DNS servers
A server that takes URL given by browser and sends back the IP addresses connected to it
Describe the process of displaying a web page on a browser [4]
- User opens browser + types in URL
- Browser asks DNS server 1. The DNS server finds the URL and sends back IP address that matches it.
- Computer sets up communication with web server
- Web server sents back HTML code which the browser interprets and displays the infromation on the computer.
Cookies
Cookies are small pieces of code or data that get stored on a users computer which are sent by web servers to the browser, they hold key info preferences like language1 currency and previous browser activity
What are the two types of cookies
-Session cookies - ceases to exist when the browser is closed
- persistent cookies - permanently stored on the hard drive
What are some uses of session cookies
- Used for making online purchases
- Used for virtual shopping baskets
- Temporarily stored for single website sessions
What are some uses of persistent cookies
- allow websites to remember user passwords, logins
- allows websites to recognize user upon login
- Save user’s item in virtual basket
- Track users browsing habits and website history
- Storing user preferences
What is digital currency?
Money that exists only in digital format, no physical forms
What is digital currency used for?
Accepted form of payment to pay for goods or services
- like cash, credit/debit, digital currency can be transferred between accounts.
True or False: Digital currency relies on a central banking system
True
What is the problem with centralization
- maintaining confidentiality + security
What is cryptocurrency?
A decentralized type of digital currency
How does crypto currency work?
- uses cryptography to track transactions
- crypto currencies are publicly available, all transactions can be tracked
- works with a blockchain network, it is more secure.
What is cryptography?
a method of protecting info and communications through codes
What is Block chaining? [5]
-it is a decentralized database.
- all transactions of the networked members are stored here
- they have a number of interconnected computers but not connected to a central server
-when a new transaction takes place, all networked comps get a copy of it
–> this mitigates hacking
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Unit one27
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8- Programming4
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Unit five- Internet and it Uses27
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Unit 5.3- Cyber security18
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Unit Two- Data Transmission31
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Unit 9- Databases30
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Unit 3- Hardware1
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3.2- Input and Output0
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3.3- Network Hardware14
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Unit 4.1- Software30
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Unit 4.2- Software25
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Unit 7- Algorithm design, and problem solving5
