I see plenty of job ads for network monitoring, I have some basic knowledge but I can't get around the idea what can go wrong with the network besides some defective components, or outside factors, is there anything that can cause the network to malfunction where the cause wasn't on the layer 1? I'm familiar with things like STP but I assume the devices in huge corporation networks are configured properly. What are the possible things that can go wrong and how likely are they?
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