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Computer Science > Communications and The internet > Flashcards

Communications and The internet Flashcards

1
Q

What is a network

A

A network is a number of computers linked together to allow them to share resources

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2
Q

Name the two main network

A

LAN and WAN

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3
Q

Define LAN

A

Local area network

Covers a small area like home, school or building site

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4
Q

Define WAN

A

Wide area network
Covers a large geographical area
It’s separates LANs over a large geographical area to form a network of networks

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5
Q

What is the data speeds measured in

A

Bits per second

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6
Q

What is the internet

A

The internet is a collection of inter-connected networks on which the ‘world wide web’ runs on

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7
Q

What is the World Wide Web

A

WWW is a collection of all the webpages in the internet

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8
Q

What are webpages

A

All of the associated files, sounds, image files that are stored on the server. These server are accused with a unique address

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9
Q

What does URL mean

A

Uniform resource locator

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10
Q

What does DNS mean

A

Dominate name system which transfers your URL files into correct ID address

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11
Q

Explain why business would use a WAN rather than a LAN

A

Because WANS are a much wider networks, computers in a WAN can communicate with computers and users in other locations
WAN networks can be managed by several different people

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12
Q

In a client-server network there are two types of computers name them

A

File servers

Client workstation

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13
Q

Explain file servers

A

Computers which control access and manage the network

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14
Q

Explain Client workstation

A

Computers which allow users to run applications and to acres the server and also networks resources, such as printers

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15
Q

Which network has only one type of computer

A

Peer-peer

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16
Q

Explain why there is no server in a peer-peer network

A

There is no server to manage the network all the computers are connected together equally

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17
Q

Explain why in a peer-to peer network the computers are all connected together equally

A

There are all equal and can communicate with each other directly without having to go through a server

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18
Q

In a client-server network how are services connected to the client

A

Clients connect to the server by using a their network addresses to access their services programs and data stored on them

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19
Q

What is a server response for the client

A

Servers are responsible for network security by allocating login names and passwords to users

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20
Q

We’re are files served in a client-server network

A

All files are held on the servers and can be backed up centrally

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21
Q

Is there a server in a peer-to-peer network

A

No,each client can act as a server. Other clients can share programs,data, and printer

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22
Q

Where is the data stored in a client network

A

Data is stored on each client and not centrally

Each user is responsible for backing up each client

23
Q

State two types of cable that can be used to network computers

A

Copper wire

Fibre optic cable

24
Q

How do devices on a network communicate

A

Through cables(wired)or radio waves(wireless)

25
Q

How are devices physical connected

A

Using either copper wire or fibre optic cable

26
Q

What is bandwidth

A

Bandwidth is the amount of data that can be transmitted per second. It is measured in bits per second

27
Q

What are Ethernet protocol used in

A

In a cable network

28
Q

What are WiFi protocols used in

A

They are used wireless networks

WiFi is one wireless technology that uses radio waves

29
Q

What do wireless networks use for to communicate

A

They use radio waves, which are part of the electromagnetic spectrum to communicate

30
Q

What is a protocol

A

A set of rules that govern how communication on a network should be formatted and what data should be included

31
Q

What is a protocol stack /suite

A

A group of networks that work togethers.

32
Q

How are protocol stacks helpful

A

The protocols are organised in layers, they pass their data to the next protocol before becoming sent to a communication system

33
Q

What are data packets used in

A

In internet protocol transmission for data that navigates the web and in other kinds of network

34
Q

What is an MAC address

A

It is a unique identifier number programmed into a device. The MAC address ensures that data is directed to the correct computer

35
Q

How are routers helpful in a home

A

Routers are used to transfer data between a home network and the internet

36
Q

How do routers pass on messages

A

They read the address information and forward the messages to the correct network

37
Q

What do wireless devices need to connect with other devices

A

Wireless access points to connect to cable networks

38
Q

What are wireless access points used for in public

A

For hotspot in public buildings

39
Q

What are hubs and switches used for

A

To link computers so that thus can communicate with each other once they have connected to the network the NIC

40
Q

What did a hub do

A

Sends every message to every computer on the network. This creates extra unnecessary network traffic

41
Q

How are switches helpful

A

They read the destination address of the messages and relay them only to the intended recipients

42
Q

How do switches and hubs effect the performance of networks

A

By the effect on the amount of network traffic

43
Q

State the function of a network router

A

A router forwards data traffic between computer networks

44
Q

What is star topology

A

Each computer is connected individual to a central point or node, which can be a file server, hub or switch

45
Q

What is mesh topology

A

Each computer or client is connected to all the other computers in the network.

46
Q

Put the TCP/IP protocol in order

A

Application
Transport
Internet
Network Access

47
Q

What does the first of the TCP/IP do (application)

A

Provides service to applications such as web browsers and email clients

48
Q

What is the purpose of transport layer

A

Checks that data sent has been received and notifies sender that data had been received

49
Q

What is the purpose of the internet layer

A

Adds the source and destination IP addresses to the data and routes it to the recipient computer

50
Q

What is the purpose of the network access layer

A

Used network-specific protocols to ensure correct transmission of data through through the local network

51
Q

What protocols are used in the application layer

A

FTP, HTTP,HTTPS,SMTP,POP,IMAP

52
Q

What is the protocols for transport

A

Transmission Control Protocol(TCP)

User datagram protocol (UDP)

53
Q

What protocol is used for internet layer

A

Internet protocol (IP)

54
Q

What protocol is used for the network access layer

A

Ethernet or WiFi protocols

Computer Science (5 decks)

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