With malicious attacks coming from anywhere targeting our webservers, we, as system administrators, need to know whether the server is under a certain attack, like Denial of Service or most commonly known as DoS attacks.

DoS attack by definition is an attack towards a certain computer, like a webserver, to make it inaccessible to its intended users. If you have a webserver, a DoS attack could be a series of too many connection to your server, coming from a single IP. And since web service is commonly an open port, it usually is a visible port and susceptible to attacks, depending on your firewall rules.
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