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1.3 Dta Exchange > Internet Structure ( 2 ) > Flashcards

Internet Structure ( 2 ) Flashcards

1
Q

What is the worlds largest WAN?

A

The internet, it is composed of billions of of LANs

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2
Q

What is a standalone?

A

A computer not connected to any other computing device

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3
Q

How is a network formed?

A

When two or more computers are connected

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4
Q

What are the two types of network?

A
  • LAN

* WAN

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5
Q

What is a wide area network?

A
  • A network which relies on third party carriers, or connections provided by a telecom company.
  • Spread over a large geographical area
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6
Q

What is a local area network?

A
  • two or more computers connected together in a single site/small geographical area connected together by cables
  • Network can consist of a number of computers, and shared resources such as printers and scanners and a central server.
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7
Q

What are some features of a LAN?

A
  • Users on a LAN can communicate with each other

* Users on the network can share resources such as printers and also share data.

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8
Q

What is a network topology?

A

Arrangement of computing devices which make up a computer network.

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9
Q

What is a bus toplogy?

A
  • Arrangement where nodes are connected in a daisy chain by a single central communications channel
  • All computers are connected to a single cable
  • Ends of cables are plugged into terminators
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10
Q

What are some advantages to a bus topology?

A
  • Cheap to install, as it requires less cable than a star and does not require additional hardware
  • Devices can be easily added
  • Better for small networks
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11
Q

What are some disadvantages of a bus topology?

A
  • If main cable fails, network data can no longer be transmitted to any of the computers/nodes, point of failure
  • Performances degradation with high levels of traffic, due to data collisions
  • Low security, due to all computers on the network being able to see all data transmissions
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12
Q

How does a bus topology work?

A
  • All nodes are connected to a single backbone cable
  • Backbones are connected to a terminator on either side ( to prevent signals bouncing back )
  • Each node is passive
  • Data is sent in one direction at a time only
  • Only one computer can transmit successfully at any one time
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13
Q

What is the direction of data travel in a bus topology?

A
  • Data is sent in one direction at a time only

* Only one computer can transmit successfully at any one time

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14
Q

What is the purpose of terminators?

A

Prevent signals bouncing back

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15
Q

What is a star network?

A

Arrangement where a central node/hub provides a common connection point,acts as a router to transmit messages.

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16
Q

What does a switch do?

A

Keeps a record of unique MAC addresses of each device on the network and can identify which computer on the network it needs to send the data to

17
Q

What are the advantages of using a star network?

A
  • If one cable fails, only one station is affected, easier to isolate problems
  • Performance does not degrade with high levels of traffic, performance remains consistent whilst under heavy loads
  • Higher transmission speeds, provides good performance
  • No problems with collisions of data since each station has its own cable to the server
  • System is more secure, since messages are only sent to where they are needed, directly to the central computer and are not able to be intercepted
18
Q

What are the disadvantages of a star network?

A
  • Expensive to set up due to length/amount of cable required
  • If central device goes down, network data cannot be transmitted to any of the nodes, since central device is point of failure
19
Q

What is the physical topology of a network?

A

The actual design, and how devices are physically connected

20
Q

What is the logical topology?

A
  • How devices communicate across the physical topology

* Shape of the path the data travels in, and describes how components communicate across the topology.

21
Q

What is WI-FI?

A

Wi-fi is a local area wireless technology that allows you to connect to other devices via a wireless network access point ( WAP )

22
Q

What does a station comprise of?

A

Computer + NIC

23
Q

What is a NIC?

A

Wireless network interface card

24
Q

What does a WAP require to function?

A

A connection to a router and the router requires a connection to a modem

25
Q

What does a wireless network require to function?

A

WAP

26
Q

How does a WAP work?

A
  • Broadcasts on a certain frequency

* All devices within range can connect

27
Q

What are some advantages of a mesh network?

A
  • No cabling costs
  • More nodes that are installed, the faster and more reliable the network becomes, since one blocked/broken connection can be circumvented by another route.

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