Section Two - Networks
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What does LAN stand for?
Local Area Network
What does a LAN cover?
A small geographical area located on a single site
Give one reason why you should use a LAN:
Sharing files is easier - network users can access the same files, work collaboratively on them and copy between machines
What does WAN stand for?
Wide Area Network
What is the purpose of a WAN?
To connect LANs that are in different geographical locations
How can WANs be connected?
Through fibre or copper telephone lines, satellite links or radio links
Give an example of a WAN you use every day:
The Internet
What is Bandwidth?
The amount of data that can be transferred in a given time
Finish the sentence: The greater the bandwidth, the…
…better the network can perform
True or False? Wired connections are generally SLOWER and LESS reliable than Wireless.
False. Wired connections are generally FASTER and MORE reliable than Wireless
What does Wireless performance depend on?
Signal Quality
What factors affect Signal Quality?
Range of Device Amount of inference from other devices Physical Obstructions
What does NIC stand for?
Network Interference Controller
What is an NIC?
An internal piece of hardware that allows a device to connect to a network
What is the purpose of a switch in a LAN?
To connect devices
What are routers responsible for?
Transmitting data between networks
What can Ethernet cables be used for?
To connect devices in a LAN
Give examples of a type of Ethernet cable:
CAT 5 CAT 6
True or False? Ethernet Cables contain THREE twisted pairs of FIBRE-OPTIC wires.
False. Ethernet Cables contain FOUR twisted pairs of COPPER wires.
Why are the wires in Ethernet cables twisted together?
To reduce internal interference
What are Coaxial cables made of?
A single copper wire surrounded by a plastic layer
What is the purpose of the plastic layer in Coaxial cables?
Insulation and shielding from outside inteference
How do fibre-optic cables transmit data?
Using light
True or False? Fibre-Optic cables are HIGH performance cables that DON’T suffer interference and CAN transmit over very large distances.
True