Web Application Flashcards
What is the WWW?
A system of interlinked hypertext documents that are accessed via the internet using a browser
What is the internet?
A global network consisting of interconnected networks using communication protocols
What is a URL?
A unique address identifying every resource on the internet
Explain the differences between the Internet and intranet
The internet is a global network consisting of interconnected networks using communication protocols, the intranet is a private network which requires a username and password
IP Address
A standard set of rules used to ensure the proper transfer of information between computers on the internet, can be static (permanent) or dynamic (temporary)
Wed Browser
Software allows users to view and use web pages on the internet, used to view HTML pages whether user online or offline
Web Server
Computer designed to deliver internet webpages across the internet or within an intranet, processes info that comes from internet infrastructure
Web hosting
To have a presence on internet web hosting required, provides individuals and organisations with access to web server and web space to store website. Host ensures website available online
FTP
Most commonly used protocol used to transfer files across the internet
ISP
Sells internet access and provides web servers which connect to search engine, also provide services such as email service, security features, customer support, digital TV package, website filtering
Search Engine
Searches internet for info using keywords or criteria
Cache
Temporary files allow browsers to download website images, data and documents for faster viewing
Cookies
Store previous activity on site, can be used to track a users browser history
Portal
Acts as main entry point to a group of web services, can require logon. Eg C2KNI
WEBSITE
A collection of HTML pages linked together on WWW, can be navigated through by clicking on hyperlinks
Web page
A page of info stored on WWW, usually written using HTML, viewed using web browser
International Telecommunications Union
UN agency responsible for allocation radio spectrum and satellite orbits, developing standards related to network technology, improving inter connectivity between countries across the world
World Wide Web Consortium
Develops standards to ensure growth of the web, promotes compatibility of HTML, standards set by it are CSS and HTML being standard languages for creating web pages
Client side processing
Splits the processing workload between the server computer and the client computer, the code needed to enable user input is downloaded and executed by browser on client computer. Advantages are it reduces the load on the server, reduces volume of web traffic
Server side processing
Sends data to server across the internet, server then runs application that processes the info and returns the result, eg online form submission
Encryption
A method of providing security by scrambling data when it is stored electronically and being transmitted. Data scrambled using a encryption key, encrypted data is meaningless to anyone who intercepts it, data must be decrypted using a key, sometimes the same key is used to both encrypt and decrypt data.
Public and private keys
Public key encryption uses two different keys, an encryption key and a decryption key. They two are mathematically related so only what is encrypted with public key can be decrypted with private key
Digital Signature
A part of a message that is encrypted by sender, used to ensure sender is who they say they are.
Digital Certificate
Used to verify senders authenticity, widely used with websites
