Cisco Certified Network Professional 2026 – 400 Free Practice Questions to Pass the Exam

TACACS+ (Terminal Access Controller Access-Control System Plus) is a protocol that provides centralized authentication and authorization for users accessing network devices. When using individual command allowance, TACACS+ enables administrators to specify which exact commands a user or group of users is allowed to execute on a network device. This granular level of control helps enhance security by ensuring that users can only perform tasks necessary for their role, thus minimizing the risk of accidental or intentional misuse of network resources.

In contrast, allowing access to all network devices or executing any command would go against the principle of least privilege, which is a core tenet of secure network management. Blanket permissions would also violate this principle, as it would provide excessive access rights to users without proper oversight. Therefore, the ability to control access to specific commands is what sets TACACS+ apart, ensuring that user privileges are tightly managed and monitored.