Performance of Networks Flashcards

1
Q

What is the speed of a network measured in?

A

bits per second

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2
Q

What does bandwidth mean?

A

How much data can be transferred over a connection in a given time

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3
Q

What does contention ratio mean?

A

Ratio of users compared to available bandwidth

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4
Q

Which type of ethernet cable is faster, Cat-5 or Cat-6?

A

Cat-6

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5
Q

How do fibre optic cables work?

A

Transfer data using light which is reflected along the inside of the cable

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6
Q

What is the bandwidth like for fibre optic cables?

A

High

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7
Q

What is meant by a backbone?

A

A backbone joins together a number of LANs in the same building or as part of a WAN and the backbone is expected to carry heavy data traffic

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8
Q

What frequency bands does Wi-Fi work at?

A

2.4GHz

5GHz

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9
Q

What is a band?

A

A range of frequencies

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10
Q

What 3 factors limit Wi-Fi performance?

A

Radio Interference
Blocked by walls
Limited connections

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11
Q

What 2 main reasons are there for ‘errors’ happening?

A

Interference

Signal is too weak

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12
Q

What is latency a technical word for?

A

Delay

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13
Q

What is the correlation between the size of the network and the latency?

A

The larger the network, then the longer it takes for a bit to travel from one point to another (Higher latency)

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14
Q

What is performance affected by on wired networks?

A
Type of cable connection (Ethernet or fibre optic)
Bandwidth available
Contention ratio
Error rates
Latency
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15
Q

What is performance affected by on wireless (Wi-Fi)networks?

A

The band chosen
Number of channels available to assign
Interference from sharing channels with other devices
Interference from Non-Wi-Fi devices emitting signals on the same frequency
Physical layout; solid walls block signals, signals get weaker over distances

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16
Q

State 7 important things about wired networks

  • Cost
  • Log in
  • Radio
  • Bandwidth
  • Security
  • Building
  • Portability
A

More costly than Wi-Fi to install in a building
Allows hundreds of people to log in at the same time
Immune to radio interference
High bandwidth
Excellent security
Not affected by building layout
Not portable

17
Q

State 7 important things about wireless networks

  • Cost
  • Log in
  • Radio
  • Bandwidth
  • Security
  • Building
  • Portability
A

Only needs a Wireless Access Point to set up, so is cheaper
Allow a limited number of people to connect at any one time
Affected by radio interference
Lower bandwidth
Not so secure as connection is by radio
Signal is affected by walls and floors
Very mobile