CMMC Practice AC.L1-3.1.1

Authorized Access Control: Limit system access to authorized users, processes acting on behalf of authorized users, and devices (including other systems).

Monarch ISC Guidance

The very first practice is to control access to your network by assigning all users unique usernames and passwords and having a user provisioning and deprovisioning process. The ensures only authorized personnel are allowed access to the network and services. While user access is the focus of this control, the practice and examples also mention controlling device access. You should distribute a statement to all staff that you will disable and remove unauthorized devices from the network, and that IT must authorize all devices before they can be connected.
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Discussion From Source

NIST SP 800-171 R2 Access control policies (e.g., identity- or role-based policies, control matrices, and cryptography) control access between active entities or subjects (i.e., users or processes acting on behalf of users) and passive entities or objects (e.g., devices, files, records, and domains) in systems. Access enforcement mechanisms can be employed at the application and service level to provide increased information security. Other systems include systems internal and external to the organization. This requirement focuses on account management for systems and applications. The definition of and enforcement of access authorizations, other than those determined by account type (e.g., privileged verses [sic] non-privileged) are addressed in requirement 3.1.2 (AC.L2-3.1.2).

References