topic 4

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What is the main difference between a hub and a switch?
they both join computers in a network but a switch sends data to specific computers instead of all the computers on a network
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What is a router?
Joins multiple networks together
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what are the three types of data transfer media?
metal wires, fibre optic cable and wireless
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what are the two types of metal wires?
unshielded twisted pair and shielded twisted pair
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What are the features of an unshielded twistwed pair?
thin wires to help cancel out interference, only suitable for small networks
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What are the features of a shielded twisted pair?
wires have a copper braiding which protects the data signals form outside interuption, more expensive, better transmission speeds than unshielded
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What are the features of fibre optic cables?
pulses of light that passes through thin glass fibres
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What are the advantages of fibre optic cables?
The data travels much faster than with other wires, a large amount of data can travel through a small cable, a lack of electrical interference
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What are the disadvantages of fibre optic cables?
The cost of cables and devices needed to connect the cable are alot greater than other media
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What are the advantages of wireless networks?
Gives the freedom to work anywhere, global standards
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What are the disadvantages of wireless networks?
high power consumtion, home networks have a limited range and there are many decurity problems
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What are the main features of a LAN's network?
confined to a single building or site
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What are the main features of a WAN's network?
spread over a wide geographical area,
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What are the 4 network topologies?
Ring,Bus,Star and Mesh
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Ring topology
All computers are arranged in a circle,data sent from one computer goes around the network till it reaches the right computer. + easy to add extra devices - a break in the network can cause the whole network to fail, faults are hard to locate
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Bus topology
all devices are connected to a common shared cable + cost effective small amount of cable needed, easy to add extra devices - if there is a break in the backbone then the network cant be used
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Star topology
central switch or router that all the computers are connected to + fault tolerant- when one cable fails the rest can continue to work - high costs due to more cables, if central device stops working then the network goes down
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Mesh topology
Data can take several paths as multiple wires are connected to various computers
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What are the features of a Peer-to-peer server?
Computers are conected to each other with no central management allows computers to easily share files with each other
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What are the advantages of a Peer-to-peer server?
cost saving no server needed, easy to set up, not reliant on a server
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What are the disadvantages of a Peer-to-peer server?
no central backups so users must take backups themselves, poorer security
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What are the features of a client server?
a more powerful computer will store all the files and programs
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What are the advantages of a client server?
better security, regular backups can be taken
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What are the disadvantages of a client server?
more expensive software and servers
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internet
large group of networks joined together, each network made of smaller networks. consists of hardware
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world wide web
information sharing model thats built ontop of the internet
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Intranets
Private networks only used by employees of the organisation
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Extranets
these are networks that aren't just restricted to staff but can be used by certain members of the pubic such as customers, partners ect. via pastwords and user names
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What are the advantages of networks?
share files, hardware and software easily, improved security, easier to backup files
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What are the disadvantages of networks?
higher cost, network may fail if the server goes down
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standards
things needed in order to keep a set of common features amoung hardware this allows hardware to be used with other hardware reducing costs
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Other cards in this set

Card 2

Front

What is a router?

Back

Joins multiple networks together

Card 3

Front

what are the three types of data transfer media?

Back

Preview of the front of card 3

Card 4

Front

what are the two types of metal wires?

Back

Preview of the front of card 4

Card 5

Front

What are the features of an unshielded twistwed pair?

Back

Preview of the front of card 5
View more cards

Comments

megancardwell

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There's a spelling error on the 28th flash card, I think you meant to say public, not pubic lol

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