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Computing > Computing - Networks & Internet > Flashcards

Computing - Networks & Internet Flashcards

1
Q

What is a LAN?

A

A local area network is a network that covers one site

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2
Q

What is a node?

A

A device connected to a network

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3
Q

Give 5 advantages of LAN

A 
It allows:
Communications between workers
Data to be shared
Peripherals to be shared
Computers to be upgraded more easily
Distributed processing
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4
Q

Give 5 disadvantages of LAN

A 
Expertise required to set up large network
Strong passwords
Changing passwords frequently
Does not allow users to install software
Wireless access requires encryption
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5
Q

What is a NIC?

A

A network interface card is a needed in a node because it produces the electrical signals that carry data

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6
Q

What is a hub?

A

A device that connects all nodes together and makes them act as one segment

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7
Q

What is a switch?

A

A device that can create and connect to different segments of the network

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8
Q

What are routers?

A

Devices that work with data packets to send data between networks

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9
Q

What are the 2 network types?

A 
Peer to peer (all computers are connected to a hub)
Client server (one computer is a server which connects to a hub, the hub connects to the other computers)
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10
Q

What is the network topology?

A

The physical layout of the network

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11
Q

Give 3 network topologies

A

Star
Ring
Bus

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12
Q

What are the advantages of star topology?

A

Fast
Few data collisions
Can set up individual segments

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13
Q

What are the advantages of ring topology?

A

Fast

One direction traffic so no collisions

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14
Q

What is the disadvantage of ring topology?

A

If there is any problems, the whole network goes down

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15
Q

What are the advantages of bus topology?

A

One common linking cable
Nodes connected off the cable
Inexpensive

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16
Q

What are the disadvantages of bus topology?

A

Slows down when there is heavy traffic
Frequent data collisions
Breakage of cable affects the whole network

17
Q

What is a WAN?

A

A wide area network is a network that covers a large geographical area and is usually provided by telecoms companies

18
Q

What is VPN?

A

A network that uses the internet as an infrastructure and needs enhanced security

19
Q

What are protocols?

A

The rules for the connection between devices on a network or from that network to another

20
Q

What is TCP/IP?

A

The most commonly used set of protocols

21
Q

What are DNS servers?

A

Servers that convert domain names (www.google.co.uk etc.) to IP addresses

22
Q

What is MAC addressing?

A

A media access control address is one that relates to the hardware of one computer (like a physical IP address)

23
Q

What is a packets?

A

Chunks of data that travel around a network until they reach their destination where they open up

24
Q

Give the 3 security methods on a network

A

Access levels (certain users have more permissions than others)
Passwords
Encryption (WEP, WPA etc.)

25
Q

Why do we have network policies?

A

Policies ensure users understand what is expected of them concering their network

26
Q

What is a modem?

A

A device that converts the analogue signal of Plain Old Telephone System (POTS) to a digital signals

27
Q

What is the difference between bandwidth and broadband?

A

Bandwidth is range of frequencies that can be used for transmitting a signal (rate of data transmission in a network)
Broadband is when the range of frequencies allows the internet speed to be higher than 4Mbps

28
Q

What is ADSL?

A

Asymmetric digital subscriber line which uses spare capacity on POTS to deliver a higher download speed (upload speed stays the same)

29
Q

What is the difference between lossy and lossless compression?

A

Lossy compression reduces file size by removing data

Lossless compression keeps all data and allows reconstruction of the original file

Computing (11 decks)

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