This front-end layer is often divided into several thin layers, such as login, border, boundary, and load balancing.

这个前端层常常进一步划分为几个子层，比如登录、边界和负载平衡。

youdao

JM: Load balancing in Fabric3 is handled at the transport layer.

JM： Fabric3中的负载均衡是在传输层处理的。

youdao

The front-end(FE) in the cluster distributes the requests to back-ends(BE) according to the layer-4 load balancing policy.

集群前端使用基于第4层的负载平衡策略将用户请求分发给后端；

youdao

Google faced a similar battle when its founders made the tough decision to layer an agnostic search service with paid ads, and balancing such a service for a consumer market has remained an algorithmic challenge for Google ever since.

FORBES: Social Networks are Dead: the Business of Google+ as-a-Service