Juniper Identity Management Service (JIMS) primarily gathers user-to-IP address mappings by reading security event logs from domain controllers. The domain PC probe is a supplementary mechanism. It is triggered only when JIMS receives a query for an IP address for which it has no user mapping from the event logs. In this scenario, JIMS actively probes the PC at that IP address to determine the logged-in user, thereby resolving the identity.

A: This is incorrect. The PC probe is an active query to an endpoint, not the analysis of domain controller logs. Log analysis is a separate, primary data collection method.

C: This is incorrect. JIMS retrieves user group membership information directly from the Active Directory domain controller using LDAP, not by probing individual PCs.

D: This is incorrect. The information flow is reversed. JIMS initiates the probe to build its identity database; the SRX Series device then queries JIMS for that information.

1. Juniper Networks. (2023). Juniper Identity Management Service (JIMS) Administration Guide.

Reference: In the "Understanding How JIMS Collects User Identity Information" section

it states: "If JIMS does not find a user for an IP address in the event log source

it can probe the PC with that IP address to get the username of the logged-in user." This directly supports option B as the correct trigger for a PC probe.

Reference: The same guide

in the "Configure an Active Directory Source" section

details how JIMS uses LDAP to query for group information

which invalidates option C.

Reference: The overall architecture described in the guide shows the SRX as a client of JIMS

querying it for information. JIMS is the component that actively collects data

invalidating option D.