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AZ-500 · Question #75

Case Study 2 - Contoso, Ltd Overview Contoso, Ltd. is a consulting company that has a main office in Montreal and two branch offices in Seattle and New York. The company hosts its entire server…

The correct answer is A. Create a new subnet on VNetwork1. Explanation Azure Firewall requires a dedicated subnet named "AzureFirewallSubnet" with a minimum size of /26; this subnet must exist within VNetwork1 before the firewall can be deployed, making creating a new subnet the mandatory first step. Option B (removing NSGs from…

Submitted by zhang_li· Mar 6, 2026Secure networking

Question

Case Study 2 - Contoso, Ltd Overview Contoso, Ltd. is a consulting company that has a main office in Montreal and two branch offices in Seattle and New York. The company hosts its entire server infrastructure in Azure. Contoso has two Azure subscriptions named Sub1 and Sub2. Both subscriptions are associated to an Azure Active Directory (Azure AD) tenant named contoso.com. Technical requirements Contoso identifies the following technical requirements: Deploy Azure Firewall to VNetWork1 in Sub2. Register an application named App2 in contoso.com. Whenever possible, use the principle of least privilege. Enable Azure AD Privileged Identity Management (PIM) for contoso.com Existing Environment Azure AD Contoso.com contains the users shown in the following table. Contoso.com contains the security groups shown in the following table. Sub1 Sub1 contains six resource groups named RG1, RG2, RG3, RG4, RG5, and RG6. User2 creates the virtual networks shown in the following table. Sub1 contains the locks shown in the following table. Sub1 contains the Azure policies shown in the following table. Sub2 Sub2 contains the virtual machines shown in the following table. All virtual machines have the public IP addresses and the Web Server (IIS) role installed. The firewalls for each virtual machine allow ping requests and web requests. Sub2 contains the network security groups (NSGs) shown in the following table. NSG1 has the inbound security rules shown in the following table. NSG2 has the inbound security rules shown in the following table. NSG3 has the inbound security rules shown in the following table. NSG4 has the inbound security rules shown in the following table. NSG1, NSG2, NSG3, and NSG4 have the outbound security rules shown in the following table. Contoso identifies the following technical requirements: Deploy Azure Firewall to VNetwork1 in Sub2. Register an application named App2 in contoso.com. Whenever possible, use the principle of least privilege. Enable Azure AD Privileged Identity Management (PIM) for contoso.com. You need to meet the technical requirements for VNetwork1. What should you do first?

Options

  • ACreate a new subnet on VNetwork1.
  • BRemove the NSGs from Subnet11 and Subnet13.
  • CAssociate an NSG to Subnet12.
  • DConfigure DDoS protection for VNetwork1.

How the community answered

(24 responses)
  • A
    88% (21)
  • C
    8% (2)
  • D
    4% (1)

Explanation

Explanation

Azure Firewall requires a dedicated subnet named "AzureFirewallSubnet" with a minimum size of /26; this subnet must exist within VNetwork1 before the firewall can be deployed, making creating a new subnet the mandatory first step. Option B (removing NSGs from subnets) is incorrect because NSG removal is not a prerequisite for Azure Firewall deployment, and NSGs can coexist with Azure Firewall in a network. Option C (associating an NSG to Subnet12) is irrelevant to the firewall deployment requirement and would not help meet the technical requirement at all. Option D (configuring DDoS protection) is a separate security feature unrelated to deploying Azure Firewall and would not be a prerequisite step.

Memory Tip: Think of Azure Firewall as a VIP tenant - it always demands its own exclusive subnet with a very specific name ("AzureFirewallSubnet") before it will move in. When you see Azure Firewall deployment questions, always ask: "Does the dedicated subnet exist yet?" - if not, that's your first step.

Topics

#Azure Firewall#Network security#Virtual Network#Subnet configuration

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