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1.4b Network Performance (Defintions (A Bit is the smallest unit of data…
1.4b Network Performance
Bandwidth and Speed
Speed is a one node experience so it is only on one type of computer whereas, bandwidth refers to the whole network - the total amount of data that can be transferred in a certain amount of time.
If one node wants to take up more bandwidth of the network it will then cause delay on how fast another node's bandwidth is.
When on the network with only one user the bandwidth is at full speed, whereas if there is more than one user on the network it is shared (unevenly)
Contention Ratio
Contention Ratio is how many people a node/user shares bandwidth with, this affects network users and home users.
Home broadband is also contented this is why contention ratio can go down, at peak times of the day your internet access will slow down.
This is because when you buy access to the internet you are actually only buying a slice of the maximum amount of bandwidth you can have, as you are sharing your bandwidth with a load of other users, you will be given a bandwidth ratio whilst/once bought that will tell you how many users you are sharing your bandwidth with.
Connection Speeds
Ethernet cable can not be more than 100 meters in length as it will lose signal if it is over this amount, it is twisted copper cable, this cable reduces interference from other computer system.
Fibre optic transmits data as beams of light, this is the most expensive type of cable, this is extremely fast but is not as resilient as Ethernet, Fibre optic is generally only used to connect LANs together.
WiFi is way slower than Ethernet, as you walk further away from WiFi the signal degrades, the signal going through the air can get corrupted because of interference such as walls, floors, ceilings and other computer systems. However WiFi is how much more easier and cheaper than others.
Error Rate
Error Rate is how often error occurs, how many times data gets corrupted/ lost between points, it can corrupted by microwaves, washing machines and even people.
WiFi interference happens because of other electrical items, as these cause interference.
Error rate is high for WiFi and low for Ethernet as cable connections are shielded from interference, the higher the error rate, the lower the network performance.
Latency
Latency is a measurement of how long it takes for one packet of data to travel from a node to its destination, most networks measure latency in milliseconds.
The lower the latency the faster the packet of data travels- the less time it take for a packet to get to its destination.
Defintions
A Bit is the smallest unit of data in a node, each bit has a single binary value either 0 or 1, 8 Bits is equal to 1 Byte
A Kilobyte is equal to 1,024 Bytes and is the measurement used for smaller files when saving or downloading on to a node
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A Gigabyte is the equivalent to 1,024 megabytes, it is usually used to measure node storage and lots of games will also usually be a few gigabytes to download
The Bit Rate is the amount of data processed in a certain amount of time, it is measured in bits per second and can be calculated by doing the Frequency x Bit x Depth x Channels