Match each security concept to its most accurate role.

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Confidentiality, integrity, availability, and authentication form the core pillars of security in networking, including Cisco environments. Confidentiality prevents unauthorized disclosure of information, ensuring that sensitive data is only accessible to authorized users. Integrity protects data from unauthorized modification, maintaining accuracy and trustworthiness. Availability guarantees that systems and data remain accessible when needed, preventing downtime or denial of service. Authentication verifies the identity of users or devices before granting access, forming the foundation for access control. In Cisco networking, these concepts guide the design and implementation of security controls. For example, ACLs enforce confidentiality by restricting traffic based on IP addresses or protocols. Integrity is supported by cryptographic hashes and digital signatures in protocols like IPsec, which detect tampering. Availability is maintained through redundancy and failover mechanisms such as HSRP or VRRP. Authentication is implemented via AAA services, requiring users to prove their identity before accessing network resources. A common exam trap is conflating these concepts, such as assuming authentication alone ensures confidentiality or that availability is less critical. In practice, Cisco devices use layered security approaches where each concept addresses different attack vectors. Understanding these distinctions helps network engineers configure appropriate controls and troubleshoot security issues effectively, ensuring a balanced and robust security posture.

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