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Elastic Load Balancing Algorithms

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Elastic Load Balancing Algorithms determine how the load balancer distributes incoming traffic across the registered instances. AWS supports two types of load balancing algorithms: 1. Round Robin: This is a default method, where each instance gets an equal distribution of traffic, ensuring balanced utilization of resources. 2. Least Outstanding Requests: This method directs incoming traffic to the instance with the least number of outstanding requests, ensuring that no single instance gets overwhelmed. Both algorithms can further leverage Sticky Sessions to bind user sessions to specific instances, providing consistent user experience during peak times. By choosing an appropriate algorithm, you can achieve higher performance, fault tolerance, and availability for your applications.

Guide to Elastic Load Balancing Algorithms

Elastic Load Balancing Algorithms (ELB Algorithms) are crucial components in the AWS architecture.

Importance: ELB Algorithms play a fundamental role in distributing incoming application or network traffic across multiple targets, such as Amazon EC2 instances. This ensures the smooth functioning of applications by providing fault tolerance so that any single point of failure can be handled with minimal service disruption.
What it is: ELB Algorithms are part of the AWS Elastic Load Balancing service. They decide how to distribute incoming requests to targets based on factors such as the current load on individual targets. The choice of algorithm depends on your specific needs. AWS provides several types of load balancing algorithms such as round robin, least outstanding requests, and IP hash.
How it works: Based on the selected algorithm, the ELB evaluates the condition of targets and forwards incoming requests accordingly. For instance, the round robin method distributes requests evenly, while the least outstanding requests method prioritizes targets with fewest pending requests.
Exam Tips: When it comes to answering questions regarding ELB Algorithms on an exam, remember to:
- Understand how different types of algorithms work and when to use which type.
- Be aware of the comparison between various algorithms in terms of efficiency, speed, and demands.
- Have practical insights about real-world scenarios where certain algorithms are more suited.

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AWS Certified Solutions Architect - Elastic Load Balancing (ELB) Example Questions

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Question 1

You are hosting a real-time multiplayer online game with different servers for different regions. How should you configure the Elastic Load Balancer to route the incoming player's request to the appropriate server?

Correct Answer: Application Load Balancer with rule-based routing

The best choice to route players to the appropriate server based on their regions is to use an Application Load Balancer with rule-based routing. This will allow the application layer to route traffic based on user location, addressing the requirements. Other options either lack the required advanced features, the correct routing type or can't handle application layer traffic.

Question 2

A popular media streaming platform needs to ensure the optimum experience for all users across the globe. Which Elastic Load Balancer setup is best suitable for this scenario?

Correct Answer: Application Load Balancer with multiple target groups

For the media streaming platform, an Application Load Balancer with multiple target groups will provide efficient request routing and achieve the best experience for global users. Network Load Balancer is not application aware, Classic Load Balancer lacks advanced routing features, and single target group options don't cover the requirements.

Question 3

A company wants to optimize latency for their web application users during peak times. Which Elastic Load Balancer algorithm should they use?

Correct Answer: Least Outstanding Requests

The Least Outstanding Requests algorithm is best suitable for optimizing latency during peak times, as it takes into account the number of outstanding requests per target and balances the load accordingly. Round Robin, Least Connections, Weighted Round Robin and Sticky Sessions don't account for the current number of requests awaiting response from instances, while the Lowest Resource Utilization doesn't exist in AWS ELB options.

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