A security domain is the determining factor in the classification of an enclave of servers/computers. A network with a different security domain is kept separate from other networks. Examples: NIPRNet, SIPRNet. JWICS, NSANet are all kept separate.
A security domain is considered to be an application or collection of applications that all trust a common security token for authentication, authorization or session management. Generally speaking, a security token is issued to a user after the user has actively authenticated with a user ID and password to the security domain.
Examples of a security domain include:
- All the Web applications that trust a session cookie issued by a Web Access Management product
- All the Windows applications and services that trust a Kerberos ticket issued by Active Directory
In an Identity Federation that spans two different organizations that share a business partner, customer or BPO relation - A partner domain, would be another security domain with which users and applications (from the local security domain) interact.
- Ping Identity Recommended Federation Deployment Architecture 
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