Azure Firewall application rules inspect HTTP and HTTPS traffic by FQDN or URL-oriented application targets. The scenario says the virtual machines may reach only updates.contoso.com and all other outbound traffic must be blocked. A network rule works at IP address, port, and protocol level, but it is not the best fit for URL/FQDN-based allowlisting. NAT rules translate inbound traffic and do not solve outbound web filtering. The important exam skill is separating data-plane access, management-plane administration, and network reachability. A storage, database, or firewall setting must be selected because it enforces the exact path requested in the scenario. Distractors often look plausible because they improve security generally, but they do not satisfy the protocol, scope, or automation requirement stated in the question. The result is a direct exam-style implementation choice: it changes the required security behavior without relying on unrelated monitoring, manual cleanup, or excessive privilege. Official Microsoft source/topic: SC-500 Study Guide > Azure Firewall; Microsoft Learn > Azure Firewall application rules and FQDN filtering.

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