B063 2017-Section 1 hardware and software

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What is star topology
A network made of wires radiating out froma central switch.
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Give 3 advantages of star topology
Better fault tolerance compared to ring and bus. Offers higher dadta transfer rates. Easy to add extra computers.
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What type of cabling do PDC use
Ethernet cabling
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Give a disadvantage of star topology
Is expensive as it needs alot of cables.
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What is bus topology
A network were all the devices are daisy-chained together
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Give 3 advantages of bus topology
Cheap to install as it doesn't need much cables. Easy to install. Easy to add extra workstations.
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Give 3 disadvantages of bus topology
Data can travel slowly if there is a lot of workstations. If the central cable stops working, the whole network stops working. Low security
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What is ring topology
A network where all the devies are connected in a ring
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Give 3 advantages of ring topology
Transmission of data is fairly simple. No data collisions. Extra computers can be added easilty
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Give 3 disadvantages of ring topology
If a cable breaks the whole network will stop working. Can be slow as data has to pas through every computer.
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What two ways can a PDC keep data secure from unauthorised access?
Install a firewall between the network and the internet connection (hardware). Kepp server in a pysically secure location (locked).
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What is the purpose of a checksum?
To verify that the data scanned in by the barcode is correct.
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How does a barcode work?
It carries a unique neumber to identify the parcel in a transaction. They are a method of encoding data that can be read by an optical scanner. Once they are scanned the computer system can use the unique number to look up the details.
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What are the advantages of a wireless barcode scanner?
It's portability increases mobility and range. It is safer and reduces risk of tripping over wire.
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Explain an advantage of using PoE
It doesnt need so many cables, therefore reducing cost.
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Other cards in this set

Card 2

Front

Give 3 advantages of star topology

Back

Better fault tolerance compared to ring and bus. Offers higher dadta transfer rates. Easy to add extra computers.

Card 3

Front

What type of cabling do PDC use

Back

Preview of the front of card 3

Card 4

Front

Give a disadvantage of star topology

Back

Preview of the front of card 4

Card 5

Front

What is bus topology

Back

Preview of the front of card 5
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