AWS Certified Cloud Practitioner 云从业者考试考题2

题目

Which of the following must be configured on an Elastic Load Balancing load balancer to accept incoming traffic?

A) A port

B) A network interface

C) A listener

D) An instance

Answer：

C. You configure your load balancer to accept incoming traffic by specifying one or more listeners.

Elastic Load Balancing 在多个目标（如 Amazon EC2 实例、容器、IP 地址和 Lambda 函数）之间自动分配传入的应用程序流量。它可以在单个可用区内处理不断变化的应用程序流量负载，也可以跨多个可用区处理此类负载。Elastic Load Balancing 提供三种负载均衡器，它们均能实现高可用性、自动扩展和可靠的安全性，因此能让您的应用程序获得容错能力。

Before you start using Elastic Load Balancing, you must configure one or more listeners for your Classic Load Balancer. A listener is a process that checks for connection requests. It is configured with a protocol and a port for front-end (client to load balancer) connections, and a protocol and a port for back-end (load balancer to back-end instance) connections.