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<p>Denial-of-Service is type of attack on which service offered by a system or a network is denied. Service may either be denied, reduce the functionality or prevent the access.</p>
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<h4>Symptoms of DoS attack:</h4>
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<ul><li>Slow performance</li><li>Increase in spam email</li><li>Unavailability of a resource</li><li>Loss of access to a website</li><li>Disconnection of a wireless or wired intern