AZ-700 Question 126
Single answerA company hosts its primary workloads in Azure� East US region and maintains a disaster recovery setup in West US. They want a highly available and redundant on-premises connection to both regions using ExpressRoute. The solution must support cross-region connectivity, minimize single points of failure, and provide straightforward failover when necessary. Which design approach best meets these requirements?
- A
Deploy a single ExpressRoute circuit connected to the East US region with no premium add-on and rely on peering to access West US.
- B
Deploy two ExpressRoute circuits�one connected to East US and another connected to West US�both using the ExpressRoute Premium add-on.
- C
Deploy a single ExpressRoute Local circuit in East US and use a VPN connection for West US.
- D
Deploy ExpressRoute in an active/active configuration using identical peering locations in the same region for both circuits.
Show answer and explanation
Correct answer: B
Explanation
To meet cross-region connectivity, redundancy, and disaster recovery requirements, an optimal design involves configuring multiple ExpressRoute circuits in different regions so that if one circuit or region becomes unavailable, traffic can fail over to the other. Using the ExpressRoute Premium add-on allows you to extend connectivity across regions within the same geopolitical area without restrictive routing limitations. For more information on ExpressRoute premium features and disaster recovery scenarios, see the official Microsoft documentation: https://learn.microsoft.com/azure/expressroute/expressroute-locations#expressroute-premium.
- A. Incorrect.
Incorrect. A single ExpressRoute circuit without the Premium add-on restricts connectivity primarily to the local region. Although you can peer or route traffic across Azure regions, this setup does not fully address redundancy and seamless cross-region failover requirements. If the primary circuit suffers an outage, you lose direct access to both East US and West US.
- B. Correct.
Correct. Two separate ExpressRoute circuits�each connecting to a different region�provide redundancy and help ensure continuous connectivity even if one circuit fails. The ExpressRoute Premium add-on enables cross-region connectivity, allowing traffic to route efficiently between East US and West US while maintaining high availability.
- C. Incorrect.
Incorrect. A Local ExpressRoute circuit limits connectivity to the local Azure region and does not address cross-region traffic. Additionally, relying on a single VPN connection for disaster recovery lacks the bandwidth, performance, and redundancy guarantees that ExpressRoute offers.
- D. Incorrect.
Incorrect. While active/active configurations can provide some degree of redundancy, both circuits in the same region and peering location do not address cross-region disaster recovery effectively. You need separate circuits in physically and logically distinct regions for true cross-region availability.