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What is Amazon Elastic Load Balancer? : Benefits and Special Features with REAL-TIME Examples

Last updated on 04th Nov 2022, Artciles, Blog

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Pramoot Prakash (AWS Cloud Architect )

Pramoot Prakash is an AWS Cloud Architect Senior Manager and has 8+ years of experience in controlling cloud-based information and cloud-Architect inside the process of making hardware and software recommendations, and handling audit logs, AWS Cloud trial.

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    • In this article you will learn:
    • 1.Elastic Load Balancer.
    • 2.Types of Elastic Load Balancer.
    • 3.Benefits of Load Balancing in AWS environment.
    • 4.Features of Elastic Load Balancing.
    • 5.Conclusion.

Elastic Load Balancer:

Elastic Load Balancing handles varying load of the application traffic in single Availability Zone or across the multiple Availability Zones.It automatically distributes an incoming application traffic across the multiple targets, such as Lambda functions, IP addresses, containers, and Amazon EC2 instances.

Types of Elastic Load Balancer:

ELB consists of a three diverse types of a load balancer which help to achieve extensive cloud computing measures These include:

Classic Load Balancer (CLB):

  • This is most fundamental way of a load balancing which replaces the conventional physical hardware with the virtual devices to provide an optimum level of an experience.
  • Classic Load Balancer is usually designed for applications that are within EC2 classic networks. It functions both at request and connection level.

Application Load Balancer (ALB):

  • It functions to the route advanced traffic to targets like EC2 instances, IP addresses, containers, Lambda functions depending on request. Application Load Balancer provides advanced request routing such that incoming traffic can be routed against the multiple availability zones.
  • Application Load Balancer contributes towards a safeguarding the security of applications by using designated protocols and ciphers. It can route request on basis of the content.
Elastic Load Balancer

Network Load Balancer (NLB):

  • Network Load Balancer operates at connection level i.e Layer 4 when a target becomes slow or unavailable it routes the traffic to the another target within Amazon Virtual Private Network based on a IP Protocol suited for both TCP and UDP traffic.
  • It can maintain the ultra-low latencies.
  • It is amalgamation of different recognized AWS services like an Auto Scaling, Amazon EC2 Container Service (ECS), Amazon CloudFormation and AWS Certificate Manager (ACM).

Benefits of Load Balancing in AWS environment:

Highly available:

  • Electric load balancing can route a traffic to the multiple targets automatically and can also load balance across a region routing towards the proper target in a multiple availability zones.


  • The TLS settings can be centrally managed and one can even discharge a workloads of the CPU while working with an Amazon Virtual Private Network Cloud providing a sustainable security, user authentication, integrated certificate management, and also SLS/TLS decryption.


  • The applications could interact among each other through microservice-based architecture and one can customize application targets by the use of an IP address in Elastic load balancer.


  • It can manage a rapid fluctuations in traffic and with the incorporation of an auto-scaling, it can meet the different levels of measurable capacity with the least manual involvement.

Hybrid load balancing:

  • It is be convenient to drift, switchover or migrate on-premises applications to cloud since the elastic load balancer can balance load across the AWS and on-premises using a same load balancer.

Robust monitoring and auditing:

  • One can keep a track of the activities of the applications, resolve the problems and know the cause of the problem by surveying a performance in real time with an assistance of Amazon CloudWatch metrics, logging and request tracing in a Elastic load balancer.
Types of Load Balancer

Features of Elastic Load Balancing:

Security: It uses an Amazon Private Virtual Network Cloud thus providing extra security to a load balancers and one can even create an internal load balancer.

Health checks:It can track the unfit targets and prohibits flow of load towards and then balances load towards the working targets.

TLS termination: With the help of a SSL/TLS decryption and integrated certificate management the CPU is offloaded and SSL settings are managed at the core.

High availability:It can automatically distribute a traffic to multiple availability zones or single availability zone working on the same load balancer.

Operational Monitoring: With an Amazon CloudWatch metrics logging and request tracking, one can overview working in a real-time.

Layer 4 and Layer 7 balancing: HTTP/HTTPS applications can be used to load balance for the 7 Layer or strictly for layer 4 which depends on a UDP and TCP controls.

Product Comparisons: Being a flexible in nature, one can make choices on basis of the need of the applications such as one using an EC2-classic network can use classic load balancer or if a flexible application is needed, one can use Application load balancer.


Amazon Web Services Elastic Load Balancer (AWS ELB) integrates a seamlessly with an Amazon’s other cloud services.

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