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GCSE Computer Science > Networks > Flashcards

Flashcards in Networks Deck (43)
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1

What is a network?

An arrangement of computers and other devices connected together to share resources and data

2

What does LAN stand for?

local area network

3

What are 3 characteristics of LAN?

-A network that covers a relatively small geographical area
-owned by the organization that uses it
-managed by a local manager or a team on that site

4

Give 3 examples of where LAN is used

1) Home
2) Hospital
3) Factory

5

What does WLAN stand for?

wireless local area network

6

What is WLAN?

like a LAN but wireless, all connects to a router

7

What does WAN stand for?

wide area network

8

What are 3 characteristics WAN?

-it covers a wide geographical area by connecting two or more LANs
-computers in a WAN can connect with computers and users in other locations
-managed by several different people or parts of an organization working together

9

What is the largest WAN?

the internet

10

What is a client-server network?

A network that has at least one server to provide services to the client computers

11

What is are 3 characteristics of a peer-to-peer network?

-doesn't have a centralized server
-all computers are equal and communicate with each other directly without having to go through a server
-each user can give other users access to their computer and their programs and to any other device connected to them

12

What is a network topology?

how the devices on a network are connected to each other

13

What is a BUS TOPOLOGY?

A bus network consists of a single cable which each workstation is connected

14

Name 2 advantages of bus topology

1) cheap to install and set up
2) easy to add new devices

15

Name 2 disadvantages of bus topology

1) if the main cable fails, the whole network will fail
2) lots of data collisions if two or more devices transmit at the same time (lower data transmission speeds)

16

What is a RING TOPOLOGY?

Cable connects one network device to connect another in a closed ring

17

Name 2 advantages of ring topology

1) no collisions because of the use of the token system
2) data transmission is simple as data only travels in one direction

18

Name 2 disadvantages of ring topology

1) slow transmission speeds, as data must pass through each computer before arriving to the destination
2) if the cable breaks then there will be no data transmission

19

What is a STAR TOPOLOGY?

each workstation is connected to a central point

20

Name 2 advantages of star topology

1) A damaged cable will not stop the whole network
2) Easy to locate faults

21

Name 2 disadvantages of star topology

1) If the hub fails, the whole network fails
2) Expensive to install

22

What are 2 advantages of connecting computer to form a network?

-The users can share resources
-files can be shared along a network allowing users to work collaboratively

23

What are the benefits of a peer-to-peer network on a small company?

-expensive server and network operating systems are not required, so it is cheaper
-specialist staff are not needed to administer and maintain the network, so it is a lot cheaper
-requires less specialist knowledge to set up

24

What are the benefits of a client-server network on a large company?

-all data can be saved on a file server, so it can all be backed up at the same time without having to back up the data on each computer seperately
-network security is stronger as access to file servers are controlled using logins and passwords

25

What is the range of frequencies commonly used for data transmissions in wireless networks?

2.4-5 GHz

26

What is meant by a channel?

each frequency range is divided into separate channels

27

What is bandwidth?

Amount of data that can be transmitted per second (measured in bps)

28

What is the bandwidth of a cable network?

10 Gbps

29

What is the bandwidth of a wireless network?

600 Mbps

30

What is the role of network interface controllers in connecting devices to computer networks?

-formats data so that it can be transmitted and received across a network
-NICs are often built on chips on the computer motherboard