What AZ-802 Questions and Answers feature?

On a Virtual WAN hub: An ExpressRoute gateway. In the offices: An ExpressRoute circuit connection.

Fabrikam ' s plan is to replace the existing WAN links between the New York and Seattle offices with Azure Virtual WAN and ExpressRoute, connecting both offices to Vnet1 through the Virtual WAN hub. Azure Virtual WAN uses its own hub-native ExpressRoute gateway object (distinct from the standalone virtual network gateway used when ExpressRoute is connected directly to a single VNet); this ExpressRoute gateway is deployed inside the Virtual WAN hub and is required before any ExpressRoute circuit can terminate into that hub. A standard virtual network gateway is used for VNet-to-VNet or VPN scenarios, not for Virtual WAN hub ExpressRoute termination, and an ExpressRoute circuit connection itself is the logical link resource, not something you deploy on the hub. At each office, connectivity into Microsoft ' s network is established through an ExpressRoute circuit connection provisioned with a connectivity provider, which then links, via Microsoft ' s backbone, into the ExpressRoute gateway in the Virtual WAN hub. A Site-to-Site VPN, an Azure application gateway (a web traffic load balancer), and an on-premises data gateway (used for Power Platform/Logic Apps connectors) are all unrelated to this ExpressRoute-based design.

DHCP1 (New York, Scope1) and DHCP2 (Seattle, Scope2) currently serve only their own local office. To make DHCP highly available across both offices, the modern, supported approach is DHCP Failover, configured per scope (option E), which replicates lease information between DHCP1 and DHCP2 in either load-balance or hot-standby mode so that either server can service either scope ' s clients if its partner becomes unavailable. However, DHCP Failover alone only helps if a client ' s DHCP broadcast can actually reach the surviving partner server across the WAN; broadcasts do not cross routed office boundaries on their own. Configuring a DHCP relay agent on the router (or another relay-capable device) in each office (option B) forwards DHCPDISCOVER broadcasts from local clients to the remote partner server whenever the local DHCP server is down, allowing failover to actually take effect for clients in either office. The legacy split-scope technique of manually carving off a percentage of the other scope ' s addresses (options A and C) is the older, pre-failover workaround and is unnecessary once DHCP Failover is used; there is also no DHCP cluster role delivered through Windows Failover Clustering (option D), since DHCP achieves high availability through Failover mode, not a clustered role.

DC3 is explicitly described as a domain controller named dc3.corp.fabrikam.com that will exist inside Vnet1, meaning it must be a genuine, writable domain controller for Fabrikam ' s existing corp.fabrikam.com AD DS forest, replicating with DC1 and DC2. The only way to run an actual domain controller for an existing on-premises forest inside Azure is to deploy a regular Azure virtual machine, place it on Vnet1, install the AD DS role on it, and promote it as an additional domain controller for corp.fabrikam.com. Microsoft Entra Domain Services is a fundamentally different, fully managed service: it creates its own separate, standalone managed domain and does not add a domain controller to, or replicate directly with, an existing on-premises forest, so it cannot be used to deploy " DC3 " as described. Microsoft Entra Application Proxy publishes on-premises web applications to external users and has nothing to do with domain controller placement. A Microsoft Entra administrative unit is a container used to scope administrative permissions over Microsoft Entra objects and is unrelated to deploying infrastructure. Therefore, an Azure virtual machine, promoted to a domain controller, is the correct implementation for DC3.