You need an external load balancer with IPv4 and IPv6, TCP pass-through on 443, backends in us-west1 and us-east1, low latency, high availability, and autoscaling. Which architecture is appropriate?
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Correct answer: Use Network Load Balancing in both regions, and use DNS-based load balancing to direct traffic to the closest region..
Why this is the answer
Network Load Balancing (NLB) in each region, combined with DNS-based load balancing, is the correct choice because it directly supports TCP pass-through on port 443 and offers IPv4 and IPv6 support. DNS-based routing allows for low latency by directing users to the closest regional NLB, and deploying NLB in both us-west1 and us-east1 ensures high availability and allows for autoscaling of backend instances within each region. Global SSL Proxy Load Balancing and Global TCP Proxy Load Balancing terminate the SSL/TCP connection at the load balancer, which isn't true TCP pass-through. Global external HTTP(S) Load Balancing is designed for HTTP/S traffic, not raw TCP pass-through.
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