Cloud Load Balancing introduces a new version of the Network Load

## Feature Feature Cloud Load Balancing introduces a new version of the Network Load Balancer—the global external passthrough Network Load Balancer, which is the global variant of the regional external passthrough Network Load Balancer. The load balancer is available in **Preview**. This load balancer variant solves use cases for Security Service Edge (SSE), DNS hosting, Adtech (real-time bidding), real-time communications (RTC), live streaming, and online gaming, among others. Global external passthrough Network Load Balancers are Layer 4 passthrough load balancers that distribute external traffic among backends (instance groups or network endpoint groups) that can reside in multiple Google Cloud regions. By using Google's global anycast IP routing, the global external passthrough Network Load Balancer steers user traffic to the closest region with healthy backends and available capacity, delivering ultra-low latency and dynamic cross-region failover to ensure resilience to regional outages. The load balancer provides you with two external IP addresses, each served by a disjoint and isolated global load balancing control and data plane server infrastructure (also known as an _availability group_) to provide high availability. The load balancer supports TCP, UDP, ESP, GRE, ICMP, and ICMPv6 traffic and can handle both IPv4 and IPv6 traffic. You can deploy your backends in any of the following Google Cloud regions: * North America: `us-west1`, `us-west4`, `us-east4`, `us-east5` * Europe: `europe-west2`, `europe-west3` * Asia: `asia-southeast1`, `asia-south1`, `asia-northeast1` * South America: `southamerica-east1` * Africa: `africa-south1` * Australia: `australia-southeast1` Note that this release doesn't support GKE backends for the global external passthrough Network Load Balancer. For details on the new load balancer, see [Global external passthrough Network Load Balancer overview](https://cloud.google.com/load-balancing/docs/network/global-networklb-architecture).