Without the proper systems in place you won't know if you've been hacked. In fact, many people learn they've been hacked long after the breach has taken place - sometimes in the form of a defaced site, sometimes due to erratic behavior or denial of service, and sometimes through a message or call from a customer or even the hacker himself.
Being proactive with Web security requires having the proper controls in place such as a network firewall, IPS or WAF, system hardening and patching, and (often most importantly) a monitoring system that can alert you to nefarious behavior.
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