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Network identity management is the administration of identities and access privileges for people, devices, and processes that use networked systems. It helps an organization associate a network request with the correct subject and determine what that subject is allowed to access.

What network identity management includes

NIST defines identity management broadly as administering identities within a system. In enterprise IT, that includes establishing and managing roles and access privileges for network users. The phrase “network identity management” is a useful description of this work, rather than a separate NIST glossary term. NIST glossary: identity management

The identities involved need not belong only to people. They can represent employees and other users, as well as devices and processes that interact with networked systems. NIST SP 800-63-4 describes digital identity services for users, while NIST’s identity-management and authentication material also recognizes devices and processes as entities.

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How identification, authentication, and authorization differ

These related activities answer different questions as a network request is handled:

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  • Identification: What identity is being claimed or assigned? A presented identifier points to a subject, but does not by itself prove that the subject is genuine.
  • Authentication: Is the claimant the subject they say they are, or do they control the required authenticator? The method and evidence used determine the strength of that verification.
  • Authorization: Given the established identity and applicable policy, which resources or actions are permitted?

Identity management administers identities and their roles or privileges; identification, authentication, and authorization are activities that help connect those identities to access decisions. NIST glossary: authentication

How identity management applies to network devices

Organizations may need to identify and authenticate devices before allowing them onto a local or wide area network. NIST SP 800-171 Rev. 3 (2024) names IEEE 802.1X with EAP and RADIUS with EAP-TLS as examples of solutions for device identification and authentication. These are implementation examples, not a universal architecture prescription. NIST SP 800-171 Rev. 3

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An address such as a MAC or IP address can help identify a device in a network context, but an identifier alone should not be treated as strong proof that the device is authentic. The authentication method matters.

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How network identity management relates to NAC and federation

Network access control (NAC)

NAC is an access-enforcement function, not another name for identity management. A NAC capability may grant or deny access based on credentials and client-health checks. It can use identity and device information when enforcing a network-access decision. NIST glossary: network access control

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Federated identity management

Federation conveys identity and authentication information between networked systems, allowing systems to rely on information established by another system under an agreed arrangement. It is one part of digital identity, alongside areas such as identity proofing and authentication. NIST SP 800-63-4 covers these services for users interacting with government information systems over networks; it supersedes SP 800-63-3 and should not be read as prescribing every enterprise deployment. NIST SP 800-63-4

Why the distinctions matter

  • A claimed username, device name, or network address identifies a subject but is not necessarily sufficient authentication.
  • Successful authentication establishes confidence in a claim; it does not automatically grant permission to every resource.
  • Authorization depends on roles, privileges, and applicable policy, while NAC can enforce a resulting access decision and incorporate device-health context.
  • Device-authentication mechanisms such as 802.1X/EAP or RADIUS with EAP-TLS address particular access needs; they do not, by themselves, constitute a complete identity-management program.

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