Fortinet Certified Professional (FCP) Network Security Practice Exam - Prep & Study Guide

The FortiGuard Querying service IP address is a specific address used by Fortinet devices to access the FortiGuard services for real-time updates and threat intelligence. The correct IP address is 173.243.140.16, as it falls within the range designated for Fortinet's global cloud services, allowing FortiGate devices to receive the necessary updates for antivirus, IPS, application control, and other security features.

The address 173.243.140.6 is also part of the Fortinet service range but is typically not designated as the primary querying service address. The addresses starting with 192.0.2.2 and 192.168.1.100 represent private and reserved IP address ranges not assigned to public-facing services. Thus, they cannot be used for the FortiGuard Querying service, as they are intended for different networking purposes. Therefore, 173.243.140.16 is the correct choice for the FortiGuard Querying service IP address.