Redundancy and fault-tolerance is one that has been built onto systems so that they can be able to withstand any condition. They act as a form of back and working around issues.
Redundancy is known to be the inputting of some key back-up elements into a system in the scenario where one part fails.
While Fault tolerance is known to be the capability of a system to still carry out its work around issues. This build up has helped made the internet robust and scalable even amidst a global pandemic that caused a huge spike in internet traffic.
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