The Internet
- Created by: frankie306
- Created on: 30-04-15 14:42
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- The Internet
- Web addresses
- http
- protocol
- domain name
- area within the website - folder / directory
- web page name
- http
- A worldwide network of devices
- Web browser
- software that lets the user access web pages
- free to download
- Data packets
- sent between computers using protocols
- pieces of data sent over a network
- Models
- client-server
- web application is hosted on a server and accessed by client computers
- peer to peer
- all devices share responsibility and there is no central server
- client-server
- Fibre Optics
- made from thin glass
- Light is passed through the cable using a transmitter
- sends light representing binary code
- Adv
- large quantities of cable can be joined together
- Less interference than copper
- less degeneration
- Dis
- expensive to replace
- Copper cables
- Electrical signals used to pass data
- coaxial
- degenerates over long distances
- unshielded twisted pair
- twisting copper cables around each other
- shielded twisted pair
- copper shielding around twisted wires
- Adv
- cheaper
- still works if no power
- Dis
- degenerates over long distance
- Broadband connections
- Broadband = high speed internet connection
- ADSL
- asymmetric digital subscriber line
- fast connection speeds
- telephone line to receive / transmit data
- Cable
- copper cable and fibre optics
- 3G / 4G
- wireless
- cellular phone network
- Protocols
- establish how 2 devices send and receive messages
- handshaking
- when two devices send messages to each other
- Key points about a message
- http
- secure web address
- encrypted
- SMTP / POP3
- used for communication with mail servers
- SMTP = send POP3 = receive
- FTP
- transfer of large files
- organises files on a web server
- VOI
- voice conversations over the internet
- Streaming
- compression reduces file sizes
- modem
- modulator-demodulator
- connects computer to other nodes
- TCP / IP
- transmission control protocol / internet protocol
- set of protocols used over the internet
- makes sure packets have correct info
- source
- which computer the message came from
- destination
- where message should go
- packet sequence
- the order the message data should be re-assembled
- data
- data in message
- error check
- to see data is sent correctly
- source
- Buffering
- temporary storage space where data is held and processed.
- Web addresses
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