Computer Science chapter 8 Internet

Name 4 differences between the internet and the WWW

-Internet is a worldwide collection of interconnected networks whilst WWW is a collection of websites and web pages accessed using the internet -Internet is the infrastructure -WWW is a part of the internet -WWW is a service on the internet

Name 10 functions of a web browser

1-Provides address bar 2-Provides navigation tools 3-Allows the use of multiple tabs 4-Stores the bookmarks and favorites 5-stores user history 6-Stores cookies 7-Makes use of hyperlinks that allow navigation between websites and webpages 8-Sends URL to DNS 9-Checks digital certificates 10-Allows files to be downloaded from the internet

Name 3 differences between session cookies and persistent cookies

1-Session cookies are stored temporarily on a computer while persistent cookies are stored permanently on a computer 2-Session cookies are stored in RAM whereas persistent cookies are stored on the hard drive.secondary storage 3-A session cookie is deleted when the browser is closed, or the website session ends whereas a persistent cookie is only deleted by the user or when the cookie expires

What are the uses of cookies? 6m

1-Store user preferences to customize the experience 2-Store login details to speed up login times 3-Store payment details 4-Store items in an online shopping basket 5-Store recent purchases 6-Store progress in online games

How persistent cookies are used to automatically enter banking details or passwords in a website

1-Webserver sends a cookie file to user's browser 2-User's login/payment details stored in encrypted file 3-A persistent cookie file is stored by browser on user's secondary storage 4-When user revisits website, webserver requests cookie file 5-Web browser then sends cookie file back to webserver to automatically enter the details

What is a persistent cookie?

A cookie that is permanently stored on the user's hard drive is is only deleted by the user or when the cookie expires stored on user's secondary storage

What is a session cookie?

A cookie that is stored temporarily on a computer It is deleted when the browser is closed, or the website session ends. Stored in temporary memory

What is the DNS and its main purpose?

A server or system that stores URLS and their matching IP addresses

What is a Webpage?

A web document written in HTML

Define HTML

Hypertext Markup Language A mark-up language used to create web pages Uses tags to format content

Define HTTP

Hypertext transfer protocol The main protocol used to control the transmission of data to and from webservers

Define HTTPS

Its a protocol used to control the transmission of data to and from webservers. it uses encryption it uses SSL

Define Protocol

Set of rules agreed by the sender and the receiver when data is transferred between devices

Define cookies

Small text files that are created and sent by webserver They are stored on a user's computer by the web browser Two types: Session cookies and persistent cookies

Describe the procedure of opening a website

The URL is typed in the web browser The web browser sends URLs to DNS DNS searched the URL to obtain the IP address of the web server If URL is not found, DNS returns an error if found: IP address sent back to web browser web browser sends a request to the webserver Webserver sends webpage's HTML code back to web broswer web browser renders HTML to display Webpage

Define Webserver

The computer that contains webpages It has an IP address and a domain

Define URL

Uniform resource locator A unique text-based address for a web page it can contain the protocol, the domain name and the file name

Describe how cookies are stored on a user's computer the first time he visits a website

User's web browser requests webpage from website for the first time. Web server replies and sends cookies back to user's browser once the website session is closed, the persistant cookies remain and the session are deletes

Define WWW

World Wide Web Consists of massive collection of web pages and websites part of the internet that users can access using web browsers

Define Internet

Worldwide collection of interconnected networks Relies on physical infrastructure that allows networks and devices to connect to other networks and devices

Define Website

a collection of related webpages

What is a Web browser?

software used to display webpages by rendering HTML