Microsoft Azure Security Engineer Associate AZ-500 Practice Question
Your virtual network has a Spoke-App subnet with a route table that contains one user-defined route (0.0.0.0/0 → virtual appliance 10.10.100.4). Virtual network gateway route propagation is disabled on the table. A site-to-site VPN gateway advertises 172.16.0.0/16 to Azure by BGP. After the route table is applied, Spoke-App can no longer reach 172.16.0.0/16. You must restore that connectivity without changing the default egress through the firewall. What should you do?
Enable virtual network gateway route propagation for the route table.
Change the next hop type of the 0.0.0.0/0 route to Virtual network gateway.
Remove the 0.0.0.0/0 route and rely on system routes.
Add a route for 172.16.0.0/16 with next hop type Virtual appliance and next hop IP 10.10.100.4.
Because virtual network gateway route propagation is disabled, the BGP-learned prefix 172.16.0.0/16 is not added to the subnet's effective routes. The only matching entry is the user-defined default route, so traffic is sent to the firewall and then dropped. Re-enabling gateway route propagation adds the more specific 172.16.0.0/16 route (next hop Virtual network gateway). Longest-prefix match then directs traffic for 172.16.0.0/16 through the VPN gateway, while all other traffic continues to follow the 0.0.0.0/0 default route through the firewall. The other options either still forward the on-premises traffic to the firewall or remove the desired forced-tunnelling behaviour.
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Microsoft Azure Security Engineer Associate AZ-500
Secure networking
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