1.3 - Exchanging data
No description yet. This curated deck is ready for daily study.
Card preview (24)
What is a standalone machine?
A single computer not connected to anything else.
What is a network?
2 or more devices connected to each other. (Either by cable or wireless)
What are the 5 advantages of networks?
• Users can share files. • Users can share peripherals and connections to other networks such as the internet. • Users can access files from any computer on the internet. • Servers can control security, software updates and the backup of data. • Communication with other people. (e.g. email + social networking)
What are the 4 disadvantages of networks?
• Increased security risks to data. • Malware and viruses easily spreadable between computers. • Computers connected may not work if server fails. • Computers may run slower if there is alot of data travelling on the network.
What are standards?
Set of hardware & software specifications that allow manufactures to create products and services that are compatible with each other.
How do standards need to be used for characters sets?
If 1 device recognises 01000001 as A, other devices also need to recognise it as A.
What is an example of a standard?
HTML - adopted within the WWW to be the standard for display of web pages in browsers.
What is a protocol?
It is a set of rules that ensure devices follow the same standards
What is TCP?
Transmission Control Protocol
What does TCP do?
• Communication over LAN/WAN. • Provides and Error free transmission between two routers.
What is IP?
Internet Protocol
What does IP do?
• Communication over LAN/WAN. • Routes packets across a wide area network.
What is UDP?
User Datagram Protocol
What are the 3 characteristics of UDP?
• Alternative to TCP but has no error checking + is less relaible so mainly obsolete. • Sends short messages using datagrams (speed is more important than accuracy). • Maintains an open two way connection ideal for gaming.
What is HTTP?
Hypertext Transfer Protocol
What does HTTP do?
• Way for client & server to send and receive requests and deliver HTML web pages. • Fundamental protocol of the WWW (World wide web).
What is HTTPS?
Hypertext Transfer Protocol Secure
What does HTTPS do?
• Way for client & server to send and reciebe requests and deliver HTML web pages. • Fundamental protocol of the WWW (World wide web). • Adds encryption and authentication. (Should be used when a website deals with sensitive information).
What is FTP?
File transfer protocol
What does FTP do?
• Sends files between computers, normally on a WAN. • People often use FTP clients.
What is POP?
Post Office Protocol
What does POP do?
Retrieves emails form a mail server and transfers them to your device, removing them from the server in the process.
What is IMAP?
Internet Message Access Protocol
What does IMAP do?
Keeps emails on the mail server, maintaining synchronicity between devices.