Confidentiality is the security objective that best ensures that information is protected against unauthorized disclosure. Confidentiality means that only authorized parties can access or view sensitive or classified information. Integrity means that information is accurate and consistent and has not been tampered with or modified by unauthorized parties. Authenticity means that information is genuine and trustworthy and has not been forged or misrepresented by unauthorized parties. Nonrepudiation means that information can be verified and proven to be sent or received by a specific party without any possibility of denial. Reference: https://www.csoonline.com/article/3513899/the-cia-triad-definition-components-and-examples.html

The BEST course of action when an online company discovers a network attack in progress is to isolate the affected network segment. This prevents the attacker from gaining further access to the network and limits the scope of the attack. Dumping event logs to removable media and enabling trace logging may be useful for forensic purposes, but should not be the first course of action in the midst of an active attack. Shutting off all network access points would be too drastic and would prevent legitimate traffic from accessing the network.