Networks 3- Network performance (bandwidth, latency etc) Flashcards
ALL NECESSARY CARDS DONE
What is bandwidth?
The amount of data that can be transferred from one point to another on a network over specific amount of time, measured in megabits per second.
Bandwidth can be symmetrical or asymmetrical.
what does larger/higher bandwidth mean?
the larger the bandwidth, the greater the amount of data that can be sent and received across the network.
(Higher bandwidth is better)
What is symmetrical bandwidth?
symmetrical bandwidth means the same amount of data can be transmitted in both directions (upload and download)
What is asymmetrical bandwidth?
the upload capacity is smaller than the download capacity.
How to calculate amount of bandwidth required when making a new network?
identify max no. of users and multiply the no. by the bandwidth require for each of the applications that will be used.
What is latency?
*The measure of the time taken to transmit data from one point to another over a network.
*Measured in milliseconds (ms)
*(Low latency is better as that means the data reaches the destination quicker)
There are several factors that have an impact on the latency of a network:
Describe about the factor of DISTANCE
this is the distance from the device that is requesting the data to the server where the data is held.
If the user accessing data from a server situated in another country, then the response time will take longer than if they were requesting from the same country.
There are several factors that have an impact on the latency of a network:
Describe about the factor of TRANSMISSION MEDIUM
The type of thing that is actually doing the transmission
Cable and fibre optic have a lower latency than satellite.
Although the radio signals being sent to and from satellites travel at the speed of light, they still have a longer distance to travel than cable or fibre optic and therefore, due to this distance, the latency is much higher.
There are several factors that have an impact on the latency of a network:
Describe about the factor of ROUTERS
A router takes time to process the information contained within the header of a data packet.
Therefore latency (delays) occurs. It is therefore useful to install multiple routers, so allowing for router hopping to alleviate the delays.
One router is busy, then the data packet hops across to the next free router.
There are several factors that have an impact on the latency of a network:
Describe about the factor of PROPAGATION DELAY
this is the length of time it takes the data packets to travel from the device to the server.
There are several factors that have an impact on the latency of a network:
Describe about the factor of STORAGE
if the storage location is taking time to process the input/output requests because it is dealing with multiple requests, then a bottleneck is created and the latency can be high.
Bottleneck: limitation of data flow by network resources
What is latency particularly important for?
*real-time applications, such as online gaming
For example, if you’re playing an online game, a high latency connection can result in lag and delays
