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GSCE Computer Science OCR > 1.4 Wired and Wireless Networks > Flashcards

1.4 Wired and Wireless Networks Flashcards

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1
Q

What is a Network?

A

Where devices have been connected together so that they can share data and resources

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2
Q

What is a Local Area Network [LAN]?

A

Covers a small geographical area such as an office

Uses their own infrastructure

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3
Q

What is a Wide Area Network [WAN]?

A

Covers a large geographical area and connects LAN’s together

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4
Q

What is Bandwith?

A

Amount of data that can be passed between network devices per second

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5
Q

What is a Server?

A

A device that provides services for other devices or clients

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6
Q

What is a Peer-Peer Network?

A

All of the computers in the network are equal to one another

They connect directly to each other

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7
Q

What is a Standalone computer?

A

A computer not connected to a Network

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8
Q

What is a Network Interface Controller [NIC]?

A

Built-in hardware that allows a device to connect to a network

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9
Q

What is Switch?

A

Connect devices on a LAN network

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10
Q

What is a Router?

A

Transmits data between the networks

For example the internet and your LAN

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11
Q

What is a Wireless Access Point [WAP]?

A

A switch that allows devices to connect wirelessly

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12
Q

How does Bandwith affect the performance of the network?

A

More Bandwith = More data can be transferred at one time

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13
Q

How does the number of users affect the performance of the network?

A

Having a lot of users = more data collision = slows down the network

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14
Q

What are some wireless factors that affect the performance of the network?

A

Walls
Distance
Signal Quality
Interference

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15
Q

How does a topology affect the performance of the network?

A

Different layouts can affect the performance of the network

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16
Q

What is a virtual network?

A

Part of a LAN or WAN where only certain devices can see and communicate with each other usually connected remotely

17
Q

What are the advantages of a client-server network?

A

Easy to take backups

Easy to manage security

18
Q

What are the disadvantages of a client-server network?

A

Expensive to setup

The server is a single-point of failure

19
Q

What are the advantages of a peer-peer to network?

A

No single point of faliure

Cheaper then client-server

20
Q

What are the disadvantages of a peer-peer network?

A

The network is less secure
Users will need to manage their own backup
Can be difficult to maintain a good order file store

21
Q

Why is it beneficial to use a LAN?

A

Sharing files is easier
Can share the same hardware
Install update and software on all computers at once

22
Q

What are the similarities between a switch and a router?

A

Both send data to the intended recipient

Both are networking devices

23
Q

What are the differences between a router and a switch?

A

A router uses an IP address to send data whilst a switch uses MAC addresses to transmit frames to other devices
Routers usually help users take a faster route for data to go through while the switch does it less efficiently
Switches are restricted to wired-only connections whilst Routers can use both wired and wireless connections
Switches can only be used on a LAN network

24
Q

What 2 types of frequency bands does WIFI use?

A

2.4 GHz and 5GHz

25
Q

What are the differences between 2.4GHz and 5GHz channels?

A

2.4Ghz has greater range and is better getting through walls

5GHz is faster over short distances

26
Q

What are Coaxial cables made up of?

A

Made up of a single copper wire surrounded by a plastic layer for insulation

27
Q

What is a modem?

A

Enables a computer to connect to the internet over a telephone line.
A modem converts digital signals from a computer to analogue signals that are then sent down the telephone line

28
Q

What is a hub?

A

A hub broadcasts data to all devices on a network.
This can use a lot of bandwidth as it results in unnecessary data being sent - not all computers might need to receive the data.

29
Q

What is a bridge?

A

A bridge is used to connect two separate LAN networks. A computer can act as a bridge through the operating system

30
Q

What is the purpose of a web server?

A

Hosting websites

Dealing with client requests

31
Q

What happens when a URL request is made from the user?

A

Browser sends the domain name to the domain name server

DNS maps the domain to an IP address and returns it to the browser

The resource is sent to a web server using IP Address

Webpage is produced

32
Q

What is the cloud?

A

Servers that can be used to store data and programs that can be accessed and used over the internet

GSCE Computer Science OCR (14 decks)

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