Final answer:
The logon ID in NTLM protocol is a unique identifier used to authenticate a user on a Windows server or workstation and track their session. Also known as a security identifier (SID), it's essential for maintaining security aspects of a user's network session.
Step-by-step explanation:
The logon ID in the context of the NTLM protocol is a unique identifier that the protocol uses to track the user session and authenticate the user to a Windows server or workstation. NTLM, which stands for NT LAN Manager, is a suite of Microsoft security protocols that provide authentication, integrity, and confidentiality to users.
The logon ID is also known as a security identifier (SID) which is a unique value of variable length used to identify a trustee (user or group) for access control purposes. In the authentication process using NTLM, the logon ID is crucial as it establishes the user's session and maintains security features of that session when accessing resources on a network.