We recommend deploying your [ExpressRoute Virtual Network Gateways](expressroute-about-virtual-network-gateways.md) as zone redundant across availability zones within a region. These availability zones are separate physical locations with independent infrastructure (power, cooling, and networking). The purpose is to protect your on-premises network connectivity to Azure from zone level failures. [Zone-redundant ExpressRoute gateways](../vpn-gateway/about-zone-redundant-vnet-gateways.md?toc=%2Fazure%2Fexpressroute%2Ftoc.json) provide resiliency, scalability, and higher availability for accessing mission-critical services on Azure.
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