
AWS Certified Advanced Networking – Specialty (ANS-C01) Certification Guide
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AWS ELB offers four flavors of LBs: an NLB, an ALB, a GLB, and a Classic Load Balancer (CLB). Regardless of which LB you choose to implement, they all share the same basic set of constructs. The benefit is that once you understand these constructs, working with different LBs is consistent. Like most Amazon services, they are regional in their configuration scope, which is an important consideration in a multi-region deployment. In the next section, you will learn about these constructs and the features common to all LB types.
Elastic LBs have several key components that work together to manage and distribute incoming traffic. Listeners are the first point of contact for incoming requests. They are configured to check for specific ports and protocols (such as HTTP, HTTPS, TCP, etc.) and determine how the LB should handle the traffic.
Routing rules then come into play, defining how the incoming traffic should be directed based on conditions...