Flashcards
The internet
Flashcards do conjunto (19)
- 1What is the internet?A collection of inter-conncected networks
- 2What is a Wide Area Network (WAN)?Any network in which the computers communicate using resources supplied by a "third party carrier".
- 3Name an example of a WANBritish Telecom
The internet etc. - 4What does a WAN use to connect and where does it spread over?A WAN uses cables, telephone lines, satellites and radio waves to connect, usually over a wide geographical area.
- 5What is an IPv4 address?A unique address used to identify a network
- 6What is replacing IPv4?A new IPv6 system of addressing.
- 7What is a circuit switching network?Circuit switching is when you make a phone call, a dedicated connection is set up between you and the person you are calling for the duration of the call
- 8Would this work to send data across the internet?No, there could never be enough lines for all the billions of people sending data across the internet, this is where "packet switching" comes in
- 9What is the job of a router?Each node is a crossroads and requires something to direct data packets to their destination along the path which is least busy at that moment.
- 10DNSDomain Name Server
- 11What does DNS technology allow the user to do?Type a name such google.co.uk into your browser. It translates the web address google.co.uk into an IP address.
- 12DNS ServersThere are 13 DNS "root" servers worldwide which keep a complete database of all names and IP addresses
- 13lower level DNS serversthese are owned by ISPs
- 14What happens when a server receives a request not in its database?It will pass the request on to another server until it reaches one with the matching IP address.
- 15Can your IP address change?if you use your laptop at home, its IP address is the one belonging to the router at home. If you take your laptop on holiday and use it at the airport your IP address does not go with you, it will change each time you move from place to place.
- 16NICNetwork Interface Cards - built into every networked device.
- 17MAC addressinga Media Access Control address is assigned to each NIC by the manufacturer.
- 18Can your computer have more than one MAC address?Yes e.g one for the ethernet and one for wireless. Mobile phones may have two e.g one for wireless and one for bluetooth.
- 19Role of a MAC addressthe geographical location of a networked device can be determined by its IP address
when you request a web page, each router along the way uses the MAC address of the next router to send the data packet on the next leg of its journey
the MAC address of a NIC never changes
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- Descrição
- GCSE Computing (Wired and Wireless networks) FlashCards sobre The internet, criado por romia manley em 17-11-2016.
- Criado por
- romia manley
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