D. Instantly, without downloading updates
With the DNS Security subscription, the cloud-based signature database provides users with instant access to newly added DNS signatures without the need to download updates1. If network connectivity goes down or is otherwise unavailable, the firewall uses the on-box DNS signature set
https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/threat-prevention/dns-security/cloud-delivered-dns-signatures
To better accommodate the influx of new DNS signatures being produced on a daily basis, the cloud-based signature database provides users with instant access to newly added DNS signatures without the need to download updates. If network connectivity goes down or is otherwise unavailable, the firewall uses the onbox DNS signature set.
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