Availability is one of the three pillars of the CIA triad, a model that defines the principles of information security. Availability describes the concept of data consistently and readily being accessible for legitimate users. Availability ensures that the network and systems are operational and resilient to disruptions, such as denial-of-service attacks, hardware failures, or natural disasters. Availability also involves maintaining backup and recovery procedures, load balancing, and redundancy mechanisms. Reference:
Understanding Cisco Cybersecurity Operations Fundamentals (CBROPS) - Cisco, Module 1: Security Concepts, Lesson 1.1: Security Principles
200-201 CBROPS - Cisco, Exam Topics, 1.0 Security Concepts, 1.1 Explain the CIA triad Cisco Certified CyberOps Associate Overview - Cisco Learning Network, Videos, 1.1 Explain the CIA triad

The exhibit shows a network diagram with a switch, a router, and two hosts. The switch has a MAC address table that maps the MAC addresses of the connected devices to the corresponding ports. A MAC flooding attack is a type of attack that aims to overload the switch's MAC address table by sending a large number of frames with spoofed source MAC addresses. This causes the switch to enter a fail-open mode, where it broadcasts all incoming frames to all ports, effectively turning it into a hub. This allows the attacker tosniff the traffic between the hosts and the router, or launch other attacks such as ARP spoofing or man-in-the- middle

The /var/log/auth.log file contains information about authentication and authorization events on a Linux system, such as successful and failed logins, sudo commands, and SSH sessions. The output in the exhibit shows a failed login attempt from a user named "root" using SSH. References: https://www.cisco.com/c/en/us
/td/docs/security/ise/2-4/admin_guide/b_ise_admin_guide_24/b_ise_admin_guide_24_new_chapter_01101.
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