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GCSE Computer Science > 1.3 Computer networks, connections and protocols > Flashcards

1.3 Computer networks, connections and protocols Flashcards

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1
Q

What are the advantages of using networks?

A

Communication, monitoring user activity, controlling and updating workstations, roaming, sharing information, resource sharing and software streaming

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2
Q

What are the disadvantages of using networks?

A

Dependence, security issues, setting up hardware,
and malware

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3
Q

List the different types of network.

A

LAN, WAN, PAN, MAN, SAN, WPAN and VPN

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4
Q

True or False: Computers in a LAN must be connected to the Internet.

A

False: Computers in a LAN need not be connected to the Internet.

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5
Q

State an example for a LAN.

A

Connection of computers in an office or school.

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6
Q

State an example for a WAN.

A

The Internet

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7
Q

What is the use of a SAN?

A

Provides servers that enable users to store files on a large scale.

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8
Q

State an example of a WPAN.

A

A Bluetooth connection with devices in a car.

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9
Q

How is a VPN made secure?

A

By using encryption algorithms.

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10
Q

What are the different network models?

A

Client-to-server network model and peer-to-peer network model

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11
Q

List the different types of server.

A

Web servers, application servers, network attached storage (NAS), print servers and mail servers.

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12
Q

What is the function of a web server?

A

Handles the user’s requests and manages the websites. Allows users to view HTML pages, CSS stylesheets and other scripts.

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13
Q

What is a peer-to-peer network?

A

In a P2P network, each and every computer in a network is responsible for providing data equally.

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14
Q

Compare the performance of client-server and P2P network models.

A

Client-Server: Performance can be improved if the server is upgraded.
P2P: If the individual computers become slow, the whole network slows down.

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15
Q

What are the three types of copper cables?

A

Coaxial, unshielded twisted pair and shielded twisted pair.

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16
Q

What are fibre optic cables?

A

Fibre optic cables are made of glass and use light to transmit data.

17
Q

What are the advantages of fibre optic cables compared to copper cables?

A

Long lifetime. Less electromagnetic interference compared to copper cables.

18
Q

What are the disadvantages of fibre optic cables compared to copper cables?

A

Expensive to install.

19
Q

What signals are used to transmit data in a wireless network?

A

Radio signals

20
Q

What are the advantages of a wireless network?

A

Inexpensive and easy to install. Multiple devices can be connected without any additional hardware.

21
Q

What are the disadvantages of a wireless network?

A

Slower compared to a wired network. Quality is disrupted due to obstructions. Security issues such as hacking.

22
Q

What are the functions of a Network Interface Card?

A

Contains device address. Provides electrical signal to send data over the network and also for receiving incoming data. Implements the protocol for communication.

23
Q

What hardware components are required for wired networking?

A

Routers, modems, hubs, switches and bridges

24
Q

What is a modem?

A

A network hardware that turns digital data to electrical signals and vice versa.

25
Q

What is topology?

A

The arrangement of various devices in a network is called its topology.

26
Q

What are the different network topologies?

A

Bus topology
Ring topology
Star topology
Mesh topology

27
Q

Why are terminators used in bus topology?

A

A terminator is installed at the end of the cable to stop the reflection of signals back to the bus.

28
Q

True or False: Bus network offers a secured connection.

A

False. Bus networks do not offer secured connection as the data is available to all the devices in the network.

29
Q

Why is installing bus network inexpensive?

A

Bus networks are inexpensive to install as much cabling is not required.

30
Q

How is the number of data collisions reduced in a ring network?

A

Data collisions are reduced by allowing the data to flow in one particular direction.

31
Q

In what case is a star network used?

A

For connecting five to six computers where speed is the priority.

32
Q

Why are star networks expensive to install?

A

Star networks are expensive because of installation of hubs and individual cabling to all devices.

33
Q

Why is a star network more reliable than bus and ring networks?

A

If a cable fails in a star network, only that particular device is affected. In the case of bus and ring networks, the whole network fails.

34
Q

What is a full mesh network?

A

A network topology in which all devices are connected to each other.

35
Q

Why is a full mesh network more reliable than a star network?

A

A full mesh network would never fail because there are many routes available for a data packet. In star networks, if hub fails, the whole network fails.

36
Q

What is a partial mesh network?

A

A network topology in which a device connects to all other devices but some devices are connected in a different topology.

37
Q

What happens to a data packet if its route fails in a mesh network?

A

The data packet is re-routed using algorithms.

GCSE Computer Science (10 decks)

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