Exam AZ-101 topic 3 question 15 discussion

HOTSPOT -
You have an on-premises data center and an Azure subscription. The data center contains two VPN devices. The subscription contains an Azure virtual network named VNet1. VNet1 contains a gateway subnet.
You need to create a site-to-site VPN. The solution must ensure that is a single instance of an Azure VPN gateway fails, or a single on-premises VPN device fails, the failure will not cause an interruption that is longer than two minutes.
What is the minimum number of public IP addresses, virtual network gateways, and local network gateways required in Azure? To answer, select the appropriate options in the answer area.
Each correct selection is worth one point.
NOTE:
Hot Area:

Suggested Answer: Explanation
Box 1: 4 -
Two public IP addresses in the on-premises data center, and two public IP addresses in the VNET.
The most reliable option is to combine the active-active gateways on both your network and Azure, as shown in the diagram below.


Box 2: 2 -
Every Azure VPN gateway consists of two instances in an active-standby configuration. For any planned maintenance or unplanned disruption that happens to the active instance, the standby instance would take over (failover) automatically, and resume the S2S VPN or VNet-to-VNet connections.

Box 3: 2 -
Dual-redundancy: active-active VPN gateways for both Azure and on-premises networks
References:
https://docs.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-highlyavailable