Elastic Load Balancer Types
There are three types of Elastic Load Balancers in AWS: Classic Load Balancer, Application Load Balancer, and Network Load Balancer. The Classic Load Balancer distributes traffic across multiple targets in a single Availability Zone or multiple Availability Zones. It operates at both the request and connection levels. The Application Load Balancer operates at the application level, meaning it routes HTTP/HTTPS requests. It provides advanced request routing features such as host-based or path-based routing. The Network Load Balancer operates at the connection level and is designed for extremely high-performance workloads, handing millions of requests per second.
Guide to Understanding Types of Elastic Load Balancers
Elastic Load Balancing (ELB) is one of the important concepts in AWS solutions architect. It supports the distribution of workloads and traffic across multiple servers, thus enhancing the overall performance of applications running on AWS.
There are three main types of ELBs in AWS:
1. Classic Load Balancer (CLB): This is the oldest type and offers basic load balancing across multiple EC2 instances.
2. Network Load Balancer (NLB): This ELB makes routing decisions at the transport layer (TCP, TLS) and can handle millions of requests per second.
3. Application Load Balancer (ALB): This ELB makes routing decisions at the application layer (HTTP/HTTPS) and supports path-based routing.
When studying for an exam on AWS Solution Architect-Elastic Load Balancing, it's crucial to understand the differences between these ELB types and when to use each one.
Exam Tips: Answering Questions on Elastic Load Balancer Types
1. Understand that each type of ELB has its use case. For example, if you need flexible application management and the ability to route traffic to multiple services, an ALB would be appropriate.
2. When choosing between NLB and ALB, remember that NLB operates at the Transport Layer (layer 4 of the OSI model), whereas ALB operates at the Application Layer (layer 7 of the OSI model).
3. Realize that the choice of a load balancer fundamentally depends on the specific requirements of your application.
4. Always read the question carefully to identify keywords which will help you determine the correct type of ELB to use.
AWS Certified Solutions Architect - Elastic Load Balancing (ELB) Example Questions
Test your knowledge of Amazon Simple Storage Service (S3)
Question 1
A company is migrating their on-premises web application to AWS. They want to distribute incoming application traffic across multiple EC2 instances to minimize downtime and offer a better user experience. Which Elastic Load Balancer type is the best option?
Question 2
You are deploying a real-time gaming application on AWS that requires low overhead and low latency. Which Elastic Load Balancer type is recommended for this use case?
Question 3
A company has a CDN for their website and wants to reduce the load on their web servers for static content. What AWS service should they use in conjunction with Elastic Load Balancer to accomplish this goal?
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