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How Elastic Load Balancing (ELB) works? | AWS
The AWS Elastic Load Balancer (ELB) is a service provided by Amazon Web Services (AWS) that automatically distributes incoming application traffic across multiple targets, such as Amazon EC2 instances, containers, IP addresses, or Lambda functions, to ensure high availability and fault tolerance of your applications.
ELB offers three types of load balancers:
1. Classic Load Balancer (CLB): The original load balancer offered by AWS, supporting both EC2-Classic and EC2-VPC platforms. It operates at both the request level and connection level. - AWS Training Course in Hyderabad
2. Application Load Balancer (ALB): Designed to route traffic to different targets based on the content of the request (HTTP/HTTPS), such as application-level routing and content-based routing. It's optimized to handle HTTP and HTTPS traffic and provides advanced features like path-based routing, host-based routing, and support for WebSocket and HTTP/2 protocols.
3. Network Load Balancer (NLB): Operates at the connection level (Layer 4) and is capable of handling millions of requests ...
... per second while maintaining ultra-low latency. It's ideal for TCP, UDP, and TLS traffic and is commonly used for high-performance scenarios like IoT, gaming, and real-time communication applications.
Key features of ELB include:
- Automatic scaling: ELB automatically scales its load balancer capacity in response to incoming traffic, ensuring that your application can handle varying levels of load without manual intervention.
- Health checks: ELB performs health checks on its registered targets and routes traffic only to healthy targets, improving the reliability of your applications.
- Integrated with other AWS services: ELB seamlessly integrates with other AWS services like Auto Scaling, Amazon ECS, AWS Certificate Manager, and AWS CloudFormation, making it easier to deploy and manage your applications.
- Security: ELB supports SSL/TLS termination, allowing you to offload SSL/TLS encryption and decryption to the load balancer. It also integrates with AWS Identity and Access Management (IAM) for fine-grained access control.
- Monitoring and logging: ELB provides detailed metrics and access logs that allow you to monitor the performance and health of your applications and troubleshoot issues effectively. - Amazon Web Services Online Course
Overall, ELB is a critical component of AWS's infrastructure services, providing a scalable, reliable, and high-performance solution for distributing incoming application traffic across multiple targets.

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