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cs networking flashcards
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- 1state giving a reason an extra piece of hardware necessary to connect a lan to the internetmodem/router/gateway
to alter signal between a and d/connect to phone line/to link the lan to a wan - 2describe what is meant by a LANlocal area network
computers linked together over a small area
hard-wired/wireles/allows communications
shared devices - 3describe how circuit switching is used to transmit data from one computer to another on a networkpath is reserved between the two computers
for the duration of the transmission
no other data can use any part of this circuit until transmission is complete
data is divided into packets of equal size which are....
...sent down the circuit in the correct order - 4Explain three differences between circuit switching and packet switching when transmitting data on a networkcs establishes a route for the duration of the message/ps has no established route
cs sends packets all on same route/ps means packets being sent on individual routes
cs message can be intercepted if route can be tapped into/ps is more secure because packets all use different routes
cs packets remain in correct order/ps packets arrive out of order
cs ties up large areas of the network for duration of message/ps maximises use of network - 5Describe what is meant by a protocolA set of rules to allow communication between devices.
- 6Describe how packet switching is used to transmit data from one computer to another computer on a networkData is split into equal sized packets
Each packet has a header of information including destination address and the place of packet in complete message
each packet may travel by a different route
at each node on the network the destination address is read and the best route is found
packets need to reordered at the destination - 7Explain two advantages of using packet switching instead of circuit switching to send a message between two computers on a networktransmission is safer from interception because it is impossible to intercept all packets as they use different routes
very efficient use of network as each channel only used for short time/does not tie up a part of the network
if there is an error then only a small, identifiable, part of the data is affected this can be retransmitted easily - 8State two differences between LAN and WANLAN over short distances/WAN over geographically remote distances
LAN hardwired or short range wireless/WAN tends to use third party communication links
LAN more secure/WAN subject to attack
LAN requires no extra communication devices/WAN requires modem - 9Describe characteristics of WANcomputers are remote
typically each computer will have its own peripherals rather than sharing them
communication are normally supplied by third party/typically telephone lines/microwaves/satellite
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- A level IT Fichas sobre cs networking flashcards, creado por declan yeomans el 20/03/2017.
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- declan yeomans
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