You plan to implement ExpressRoute FastPath between your on-premises datacenter and Azure. When creating the ExpressRoute gateway, you must minimize downtime in the event of a single Azure datacenter failure. Which ExpressRoute gateway SKU should you use?
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Correct answer: ErGw3AZ.
Why this is the answer
ErGw3AZ is the correct choice because it is a zone-redundant gateway SKU. Zone-redundant gateways deploy instances across multiple Azure Availability Zones within a region, ensuring high availability and minimizing downtime during a single Azure datacenter (zone) failure. This design is crucial for mission-critical connections like ExpressRoute FastPath. High Performance and Ultra Performance are older gateway SKUs that do not inherently offer zone redundancy. ErGw1AZ and ErGw2AZ are also zone-redundant SKUs, but ErGw3AZ offers higher throughput and more connections, making it suitable for demanding scenarios like FastPath.
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