What are some of the most common events that may indicate an attack in progress?

What will be an ideal response?

The following is a list of common events that may indicate an attack in progress, which in turn may lead to reporting a security incident:* The execution of an unusual process using network resources could be a sign of a denial-of-service (DoS) attack.* A pattern of many employee complaints of computer malfunctions on their systems may herald a virus or worm attack.* Resource requests may increase in an unusual way and result in the slowing down of a network. This could also be an indication of a denial-of-service attack.* An authentication request by an IP address that is not a part of the network may indicate an intrusion attempt. This may be an attempt by a hacker trying to access the network in search of confidential information.