You need to know if the target network connection is down, if the service itself is down, or if the network connection going into that service is the source of the problem. You rely on a network or internet service which is having problems (slow performance, disconnects and other similar problems).You're a systems administrator and need to be alerted whenever connectivity to one of your servers goes down.
You have an interest in the Internet, or networking in general, and want to learn more.
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