Flashcards
Computer Science revision (DEP 8)
Cards in this deck (6)
- 1NetworkA network is multiple computers that work together. There are many type of networks, The types of networks are: Bus topology, star topology, ring topology etc...
There are pro can there are cons with networks here are some advantages: it allows users to share data, Allows users to use the same software, allows the software that is shared to be updated at the same time. here are some disadvantages: Purchasing the network cabling and file servers can be expensive, Managing a large network is complicated, requires training and a network manager usually needs to be employed, viruses can spread to other computers throughout a computer network. - 2Bus topology, Ring topology and Star topologyFirstly the "bus topology" is the simplest and least efficient, this is because it is linier and only has one line that spans to multiple work stations like a bus rout however this can cause bottle necks causing the network to slow down.
The second type of topology is a "ring topology" is another network design and is more efficient than a bus topology. This is because the data will only be sent in one direction to the right or to the left.
Finally the "star topology" is the final network design and is the most efficient but is costly.
the Advantages of;
bus topology: its not too expensive, simple
ring topology: data can only flow one way avoiding major bottlenecks
star topology: data can flow form any work station to another workstation without having to pass other work stations.
The disadvantages of;
bus topology: it can cause major bottlenecks, only suitable for a small networks if a work station crashes or brakes then the network will crash as it cannot pass.
ring topology: if a work station has become broken then the network will crash because data only flows one way. - 3LAN and WANLAN: Local Area Network
WAN: Wide Area Network - 4It is decided to put in a central storage facility and to link this with the two checkouts using a LAN (i) Describe what is meant by LAN (ii) state giving a reason, an extra piece of hard ware necessary to connect the LAN to the internetLocal Area Network
Hardware: Modem/Router/Gateway
reason: To alter signal between A and D/to connect to phone line/to link the LAN to a WAN - 5(a) Describe how circuit switching is used to transmit data from one computer to another on a network.-Path is reserved between the two computers
-...For the duration of the transmission
-no other data can use any part of this circuit until the transmission is complete
-Data is divided into packets of equal size which are...
-...Sent down the circuit in the correct order
(1 per bullet, max 3) - 6(b) Explain three differences between circuit switching and packet switching when transmitting data on a network..CS 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
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- Flashcards on Computer Science revision (DEP 8), created by Jason Appleton on 20/03/2017.
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- Jason Appleton
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