Exam AZ-720 topic 5 question 9 discussion

Actual exam question from Microsoft's AZ-720

Question #: 9
Topic #: 5

A company has virtual machines (VMs) in the following Azure regions:
• West Central US
• Australia East
The company uses ExpressRoute private peering to provide connectivity to VMs hosted in each region and on-premises services.
The company implements global VNet peering between a VNet in each region. After configuring VNet peering, VM traffic attempts to use ExpressRoute private peering.
You need to ensure that traffic uses global VNet peering instead of ExpressRoute private peering. The solution must preserve existing on-premises connectivity to Azure VNets.
What should you do?

A. Add a user-defined route to the subnets route table.
B. Add a filter to the on-premises routers.
C. Disable the ExpressRoute peering connections for one of the regions.
D. Add a second VNet to the virtual machines and configure VNet peering between the VNets.

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Suggested Answer: A 🗳️

by terawatt at July 21, 2023, 2:39 p.m.

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terawatt

1 year, 11 months ago

Selected Answer: A

A. Add a user-defined route to the subnets route table. When Azure needs to route traffic, it uses some pre-defined system routes. However, you can override these routes by creating a user-defined route (UDR) in the subnet's route table. This enables you to make traffic follow a path that you specify. In this case, to ensure that traffic uses global VNet peering instead of ExpressRoute private peering, you should create a user-defined route and associate it with the subnets that the VMs are connected to. This will direct the traffic from the VMs to the peered VNet, rather than routing it over the ExpressRoute connection. The other options (B, C, D) do not provide a valid solution to the problem. Changing the on-premises routers or disabling ExpressRoute peering could disrupt the existing on-premises connectivity, and adding a second VNet would not change the existing traffic flow between the VMs and the on-premises services.

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