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AQA Computer Science > Networking > Flashcards

Networking Flashcards

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1
Q

Name 2 Advantages of a Network

A

Easy Communication, Expensive peripherals can be shared

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2
Q

What are the 4 layers?

A

Link, Internet, Transport and Application

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3
Q

What is the Link layer for?

A

It is responsible for placing the packets on the network and also receiving the packets. It is where the data is sent/recieved. It is sent using the specified protocols. The MAC Address is also attached

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4
Q

What is the Application layer for?

A

It provides applications the ability to access the services of the other layers and it defines the protocols that applications use to exchange data. An appropriate header is added. It also needs to encode it, ASCII or UniCode.

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5
Q

What is the Transport layer for?

A

Sets up the connection. It then receives the data from the application layer. It numbers the packets so that they’re reassembled in the correct order. It looks at what packets have arrived and sends the acknowledgement.

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6
Q

What is the Network layer for?

A

It provides the data routing paths. It will address and package the packet.

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7
Q

What does FTP Stand for?

A

File transfer protocol – for transferring files between devices.

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8
Q

What does HTTP Stand for?

A

Hypertext transfer protocol – Displaying web pages, html or php.

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9
Q

What does HTTPS Stand for?

A

Hypertext transfer protocol secure – Displaying web pages securely

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10
Q

What does SMTP Stand for?

A

Simple mail transfer protocol – Used for mail delivery

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11
Q

What does POP Stand for?

A

Post office protocol – Receiving mail(Storing LOCALLY – NO LONGER ON SVR)

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12
Q

What does IMAP Stand for?

A

Internet message access protocol – Receiving mail (Storing remotely and syncing)

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13
Q

What does TCP stand for?

A

Transmission control protocol - is a standard that defines how to establish and maintain a network conversation via which application programs can exchange data.

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14
Q

What does UDP stand for?

A

User Datagram Protocol - a protocol used in message transport or transfer. This is not connection based which means that one program can send a load of packets to another and that would be the end of the relationship.

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15
Q

What does IP stand for?

A

Internet Protocol – Identifies the location of a device on the Internet. Routes individual packets from source to destination via routers.

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16
Q

What is the advantages of the TCP/IP Layers?

A

TCP/IP is split into layers because decomposition means that:
• Complex problem can be broken into smaller, manageable, pieces

  • Changes in one layer do not impact on other layers
  • It provides a universal standard for hardware and software manufactures to follow
  • Each layer carries out distinct functions which means that it avoids repetition of tasks.
17
Q

What is MAC Address filtering?

A

MAC address filtering allows you to define a list of devices and only allow those devices on your Wi-Fi network.

18
Q

What is a white list and what would it contain?

A

A white list is a list of people that are allowed to access the said thing, whether it is a network or just an area of the network.

19
Q

What is a firewall?

A

A firewall acts as a barrier between a trusted network and an untrusted network. A firewall controls access to the resources of a network through a positive control model. This means that the only traffic allowed onto the network is defined in the firewall policy; all other traffic is denied.

20
Q

What are the three topologies?

A

STAR, BUS, RING

21
Q

What is the best?

A

STAR

22
Q

What are the three networks?

A

WAN LAN PAN

23
Q

What is a Server?

A

A dedicated computer that delivers a certain function. Servers are often powerful custom made computers. An example of a server would be a file server. It provides a service.

24
Q

What is a client?

A

A client is often a computer which is connected to the network which accesses the server and the network resources.

25
Q

What is the communication medium

A

The communication medium is the medium in which the client is connected to the network. Guided = Cable Unguided = Wireless

26
Q

What is the network adapter?

A

This is the device that communicates with the other devices in the network.

27
Q

What is a router/WAP?

A

A router acts as a gateway to the network. A WAP also acts as a gateway but for wireless devices.

28
Q

What is a network resource?

A

Peripheral devices are shared such as printers that can access the network. Also a network share could be classed as a resource.

29
Q

What is a protocol?

A

A protocol is the way that the computers can communicate with each other such as TCP/IP.

30
Q

What is the star topology?

A

There is a PC or Switch/Router in the centre of the network that all of the PCs plug into. A star network consists of one central hub which acts as a conduit to transmit messages.

31
Q

What is the Bus topology?

A

A bus network is an arrangement in a local area network (LAN) in which each node (workstation or other device) is connected to a main cable or link called the bus. Performance issues.

32
Q

What is the ring network?

A

In a ring network each device (workstation, server, printer) is connected to two other devices, this forms a ring for the signals to travel around. Each packet of data on the network travels in one direction and each device receives each packet in turn until the destination device receives it.

33
Q

What should network diagrams include?

A
  • Three PCs
  • One shared device
  • Servers
  • Router Connecting devices to internet
  • Topology specific devices
  • Devices need a NIC

AQA Computer Science (1 decks)

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