AZ-800 Azure Route Tables and User-Defined Routes

Question 1

What is the primary purpose of User-Defined Routes (UDRs) in Azure Virtual Networks?

Accepted Answer

To override Azure's default system routes and control traffic flow

Answer

UDRs allow administrators to override Azure's default system routes to precisely control how traffic is routed within and out of a VNet.

Question 2

Which next hop type is used in a UDR to send traffic to an Azure Firewall or Network Virtual Appliance (NVA)?

Accepted Answer

VirtualAppliance

Answer

The VirtualAppliance next hop type routes traffic to a specific private IP address, typically an NVA or Azure Firewall instance.

Question 3

How many route tables can be associated with a single subnet at one time?

Accepted Answer

One

Answer

Only one route table can be associated with a subnet at a time, though the same route table may be associated with multiple subnets.

Question 4

When Azure selects a route for outbound traffic and multiple routes match, what algorithm does it use?

Accepted Answer

Longest prefix match — the most specific route is selected

Answer

Azure uses longest prefix match, selecting the most specific (longest subnet mask) route that matches the destination IP address.

Question 5

What happens when a UDR has the same address prefix as an existing Azure system route?

Accepted Answer

The UDR takes precedence over the system route

Answer

UDRs take precedence over system routes with the same address prefix, allowing administrators to intentionally override default Azure routing behavior.

AZ-800 - Microsoft Azure Networking Solutions Practice Test

AZ-800 - Microsoft Azure Networking Solutions Practice Test

AZ-800 Azure Route Tables and User-Defined Routes