If no license has been installed, within how many days from the upgrade date can you install a valid device management license?

The correct answer, indicating that you can install a valid device management license within 180 days from the upgrade date if no license has been installed, is essential for understanding licensing management within firewall products.

When a firewall is upgraded, it typically allows for a grace period during which a valid license can be applied, even if none was installed before the upgrade. This grace period is crucial because it provides users with sufficient time to obtain and install a license without losing access to the necessary management features of the device. The specific duration of 180 days is designed to accommodate various operational practices and ensure continuity of service, enabling administrators to plan and implement licensing without hurried decisions.

In contrast, other durations such as 90, 150, or 100 days would not align with the established protocol that aims to provide adequate flexibility for license management following significant updates to the system. Thus, understanding the reaffirmed time frame of 180 days is essential for effective management and operational readiness post-upgrade.