Setting up a network, establishing connectivity, and sharing resources is not the end of the list of responsibilities for network administrators. You can’t just put a network on autopilot. Just like a human body requires monitoring by doctors, dentists, and entities, like scales and mirrors, a network needs to be constantly analyzed, scrutinized, and tweaked to ensure security and efficiency.
What traffic is entering the network? What traffic is leaving the network? How should firewalls that are either too permissive or too restrictive be modified? Is there anything malicious going on inside the network? ...
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