Load Balancer Use Cases Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report In the landscape of digital infrastructure, maintaining optimal performance, high availability, and robust security are very important. Enter load balancers – the silent architects behind the seamless distribution of incoming traffic across servers or computing resources. From small-scale web applications to large enterprise environments, load balancers greatly optimize resource utilization, enhance reliability, and protect against potential disruptions. Load Balancer Use CasesWhat is a load balancer?A load balancer is a crucial component in modern network infrastructure that distributes incoming network traffic across multiple servers to ensure no single server becomes overwhelmed. This helps improve the responsiveness and availability of applications, services, and websites. Here's an overview of what a load balancer does and its key features: Functions of a Load BalancerTraffic Distribution:Load Distribution: Distributes incoming traffic evenly across multiple servers to prevent any single server from becoming a bottleneck.Balancing Algorithms: Uses algorithms such as round-robin, least connections, and IP hash to determine how traffic should be distributed.Fault Tolerance and High Availability:Health Checks: Regularly checks the health of servers to ensure they are capable of handling requests. Routes traffic away from unhealthy or downed servers.Failover: Automatically redirects traffic to operational servers if a server fails.Scalability:Horizontal Scaling: Allows adding or removing servers as demand changes, ensuring the system can handle varying loads without downtime.Auto-Scaling Integration: Works with auto-scaling solutions to dynamically adjust the number of active servers based on real-time traffic.Load Balancer Use Cases Here are six use cases for load balancers, each explained in detail along with illustrative images: 1. Web ApplicationsWeb applications often experience variable traffic loads, especially during peak usage times. A load balancer distributes incoming HTTP requests across multiple web servers to ensure consistent performance and availability. Traffic Distribution: Incoming requests are evenly distributed to multiple web servers.Health Checks: Monitors the health of web servers to route traffic only to healthy ones.Scalability: New web servers can be added during high traffic periods without downtime.2. Microservices ArchitecturesIn a microservices architecture, different services need to communicate efficiently. A load balancer manages the load among these services to ensure smooth operation and high performance. Service Discovery: Helps in finding the appropriate microservice instance.Inter-Service Communication: Balances the load between microservices to avoid bottlenecks.Fault Tolerance: Redirects requests from failed microservices to healthy ones.3. E-commerce SitesE-commerce sites require high availability and fast response times, especially during sales events. A load balancer helps handle the high volume of transactions and ensures smooth user experience. Session Persistence: Ensures users' sessions remain active on the same server.Security: Protects against DDoS attacks and other threats.Performance Optimization: Offloads SSL termination to improve server performance.4. APIsAPIs need to handle a large number of requests from different clients. A load balancer distributes these requests across multiple API servers to ensure reliability and performance. Load Distribution: Evenly spreads API requests across servers.Rate Limiting: Helps control the number of requests per client to prevent abuse.Monitoring: Tracks API performance and redirects traffic from failing servers. 5. Cloud ServicesCloud services need to scale dynamically based on demand. Cloud-based load balancers distribute traffic across various instances, ensuring seamless scaling and high availability. Auto-Scaling Integration: Works with cloud auto-scaling features to add or remove instances.Geographic Distribution: Directs traffic to the nearest data center for better performance.Cost Efficiency: Optimizes resource use and reduces operational costs6. Content Delivery Networks (CDN)6. Content Delivery Networks (CDN)CDNs distribute content to users from the closest edge server. Load balancers manage traffic across these edge servers to ensure fast and reliable content delivery. Global Traffic Management: Directs users to the nearest or fastest edge server.Latency Reduction: Minimizes latency by distributing load effectively.High Availability: Ensures content is always available by rerouting traffic from failing servers. Comment More infoAdvertise with us Next Article Must Know System Design Concepts G goodfitjojp Follow Improve Article Tags : System Design Similar Reads System Design Tutorial System Design is the process of designing the architecture, components, and interfaces for a system so that it meets the end-user requirements. This specifically designed System Design tutorial will help you to learn and master System Design concepts in the most efficient way, from the basics to the 3 min read Must Know System Design Concepts We all know that System Design is the core concept behind the design of any distributed system. Therefore every person in the tech industry needs to have at least a basic understanding of what goes behind designing a System. With this intent, we have brought to you the ultimate System Design Intervi 15+ min read What is System DesignWhat is System Design? A Comprehensive Guide to System Architecture and Design PrinciplesSystem Design is the process of defining the architecture, components, modules, interfaces, and data for a system to satisfy specified requirements. Involves translating user requirements into a detailed blueprint that guides the implementation phase. The goal is to create a well-organized and effic 9 min read System Design Life Cycle | SDLC (Design)System Design Life Cycle is defined as the complete journey of a System from planning to deployment. The System Design Life Cycle is divided into 7 Phases or Stages, which are:1. Planning Stage 2. Feasibility Study Stage 3. System Design Stage 4. Implementation Stage 5. Testing Stage 6. Deployment S 7 min read What are the components of System Design?The process of specifying a computer system's architecture, components, modules, interfaces, and data is known as system design. It involves looking at the system's requirements, determining its assumptions and limitations, and defining its high-level structure and components. The primary elements o 10 min read Goals and Objectives of System DesignThe objective of system design is to create a plan for a software or hardware system that meets the needs and requirements of a customer or user. This plan typically includes detailed specifications for the system, including its architecture, components, and interfaces. System design is an important 5 min read Why is it Important to Learn System Design?System design is an important skill in the tech industry, especially for freshers aiming to grow. Top MNCs like Google and Amazon emphasize system design during interviews, with 40% of recruiters prioritizing it. Beyond interviews, it helps in the development of scalable and effective solutions to a 6 min read Important Key Concepts and Terminologies – Learn System DesignSystem Design is the core concept behind the design of any distributed systems. System Design is defined as a process of creating an architecture for different components, interfaces, and modules of the system and providing corresponding data helpful in implementing such elements in systems. In this 9 min read Advantages of System DesignSystem Design is the process of designing the architecture, components, and interfaces for a system so that it meets the end-user requirements. System Design for tech interviews is something that can’t be ignored! Almost every IT giant whether it be Facebook, Amazon, Google, Apple or any other asks 4 min read System Design FundamentalsAnalysis of Monolithic and Distributed Systems - Learn System DesignSystem analysis is the process of gathering the requirements of the system prior to the designing system in order to study the design of our system better so as to decompose the components to work efficiently so that they interact better which is very crucial for our systems. System design is a syst 10 min read What is Requirements Gathering Process in System Design?The first and most essential stage in system design is requirements collecting. It identifies and documents the needs of stakeholders to guide developers during the building process. This step makes sure the final system meets expectations by defining project goals and deliverables. We will explore 7 min read Differences between System Analysis and System DesignSystem Analysis and System Design are two stages of the software development life cycle. System Analysis is a process of collecting and analyzing the requirements of the system whereas System Design is a process of creating a design for the system to meet the requirements. Both are important stages 4 min read Horizontal and Vertical Scaling | System DesignIn system design, scaling is crucial for managing increased loads. Horizontal scaling and vertical scaling are two different approaches to scaling a system, both of which can be used to improve the performance and capacity of the system. Why do we need Scaling?We need scaling to built a resilient sy 5 min read Capacity Estimation in Systems DesignCapacity Estimation in Systems Design explores predicting how much load a system can handle. Imagine planning a party where you need to estimate how many guests your space can accommodate comfortably without things getting chaotic. Similarly, in technology, like websites or networks, we must estimat 10 min read Object-Oriented Analysis and Design(OOAD)Object-Oriented Analysis and Design (OOAD) is a way to design software by thinking of everything as objects similar to real-life things. In OOAD, we first understand what the system needs to do, then identify key objects, and finally decide how these objects will work together. This approach helps m 6 min read How to Answer a System Design Interview Problem/Question?System design interviews are crucial for software engineering roles, especially senior positions. These interviews assess your ability to architect scalable, efficient systems. Unlike coding interviews, they focus on overall design, problem-solving, and communication skills. You need to understand r 5 min read Functional vs. Non Functional RequirementsRequirements analysis is an essential process that enables the success of a system or software project to be assessed. Requirements are generally split into two types: Functional and Non-functional requirements. functional requirements define the specific behavior or functions of a system. In contra 6 min read Communication Protocols in System DesignModern distributed systems rely heavily on communication protocols for both design and operation.Communication protocols facilitate smooth coordination and communication in distributed systems by defining the norms and guidelines for message exchange between various components.By choosing the right 6 min read Web Server, Proxies and their role in Designing SystemsIn system design, web servers and proxies are crucial components that facilitate seamless user-application communication. Web pages, images, or data are delivered by a web server in response to requests from clients, like browsers. A proxy, on the other hand, acts as a mediator between clients and s 9 min read Scalability in System DesignWhat is Scalability and How to achieve it?Scalability is the capacity of a system to support growth or to manage an increasing volume of work. When a system's workload or scope rises, it should be able to maintain or even improve its performance, efficiency, and dependability. This is known as scalability. A system must be scalable in order 7 min read Which Scalability approach is right for our Application? - System DesignWe have introduced Scalability and different methods to achieve it. Let us now discuss how to make a scalability choice for your system requirements.Factors that affect choosing the correct method of scalabilityNow, let's talk about what makes you choose one way over the other:How Your App Is Built 4 min read Primary Bottlenecks that Hurt the Scalability of an Application - System DesignA bottleneck in a system is a point where the flow of data or processing is limited, causing the overall system performance to degrade. Bottlenecks are like narrow choke points in a highway; when traffic (data or requests) surpasses the capacity of these points, it leads to congestion and delays. Da 4 min read Databases in Designing SystemsComplete Guide to Database Design - System DesignDatabase design is key to building fast and reliable systems. It involves organizing data to ensure performance, consistency, and scalability while meeting application needs. From choosing the right database type to structuring data efficiently, good design plays a crucial role in system success. Th 11 min read SQL vs. NoSQL - Which Database to Choose in System Design?When designing a system, one of the most critical system design choices is among SQL vs. NoSQL databases can drastically impact your system's overall performance, scalability, and usual success. What is SQL Database?Here are some key features of SQL databases:Tabular Data Model: SQL databases organi 5 min read File and Database Storage Systems in System DesignFile and database storage systems are important to the effective management and arrangement of data in system design. These systems offer a structure for data organization, retrieval, and storage in applications while guaranteeing data accessibility and integrity. Database systems provide structured 4 min read Block, Object, and File Storage in System DesignStorage is a key part of system design, and understanding the types of storage can help you build efficient systems. Block, object, and file storage are three common methods, each suited for specific use cases. Block storage is like building blocks for structured data, object storage handles large, 5 min read Database Sharding - System DesignDatabase sharding is a technique for horizontal scaling of databases, where the data is split across multiple database instances, or shards, to improve performance and reduce the impact of large amounts of data on a single database.Database ShardingIt is basically a database architecture pattern in 8 min read Database Replication in System DesignMaking and keeping duplicate copies of a database on other servers is known as database replication. It is essential for improving modern systems' scalability, reliability, and data availability.By distributing their data across multiple servers, organizations can guarantee that it will remain acces 6 min read High Level Design(HLD)What is High Level Design? - Learn System DesignHigh-level design or HLD is an initial step in the development of applications where the overall structure of a system is planned. Focuses mainly on how different components of the system work together without getting to know about internal coding and implementation. Helps everyone involved in the p 9 min read Availability in System DesignA system or service's readiness and accessibility to users at any given moment is referred to as availability. It calculates the proportion of time a system is available and functional. Redundancy, fault tolerance, and effective recovery techniques are usually used to achieve high availability, whic 5 min read Consistency in System DesignConsistency in system design refers to the property of ensuring that all nodes in a distributed system have the same view of the data at any given point in time, despite possible concurrent operations and network delays.Importance of Consistency in System DesignConsistency plays a crucial role in sy 8 min read Reliability in System DesignReliability is crucial in system design, ensuring consistent performance and minimal failures. System reliability refers to how consistently a system performs its intended functions without failure over a given period under specified operating conditions. It means the system can be trusted to work c 5 min read CAP Theorem in System DesignAccording to the CAP theorem, only two of the three desirable characteristics—consistency, availability, and partition tolerance—can be shared or present in a networked shared-data system or distributed system.The theorem provides a way of thinking about the trade-offs involved in designing and buil 5 min read What is API Gateway?An API Gateway is a key component in system design, particularly in microservices architectures and modern web applications. It serves as a centralized entry point for managing and routing requests from clients to the appropriate microservices or backend services within a system. An API Gateway serv 8 min read What is Content Delivery Network(CDN) in System DesignThese days, user experience and website speed are crucial. Content Delivery Networks (CDNs) are useful in this situation. A distributed network of servers that work together to deliver content (like images, videos, and static files) to users faster and more efficiently.These servers, called edge ser 7 min read What is Load Balancer & How Load Balancing works?A load balancer is a networking device or software application that distributes and balances the incoming traffic among the servers to provide high availability, efficient utilization of servers, and high performance. Works as a “traffic cop†routing client requests across all serversEnsures that no 8 min read Caching - System Design ConceptCaching is a system design concept that involves storing frequently accessed data in a location that is easily and quickly accessible. The purpose of caching is to improve the performance and efficiency of a system by reducing the amount of time it takes to access frequently accessed data.=Caching a 9 min read Communication Protocols in System DesignModern distributed systems rely heavily on communication protocols for both design and operation.Communication protocols facilitate smooth coordination and communication in distributed systems by defining the norms and guidelines for message exchange between various components.By choosing the right 6 min read Activity Diagrams - Unified Modeling Language (UML)Activity diagrams are an essential part of the Unified Modeling Language (UML) that help visualize workflows, processes, or activities within a system. They depict how different actions are connected and how a system moves from one state to another. By offering a clear picture of both simple and com 10 min read Message Queues - System DesignMessage queues enable communication between various system components, which makes them crucial to system architecture. Serve as buffers and allow messages to be sent and received asynchronously, enabling systems to function normally even if certain components are temporarily or slowly unavailable. 8 min read Low Level Design(LLD)What is Low Level Design or LLD?Low-Level Design (LLD) plays a crucial role in software development, transforming high-level abstract concepts into detailed, actionable components that developers can use to build the system. LLD is the blueprint that guides developers on how to implement specific components of a system, such as cl 6 min read Authentication vs Authorization in LLD - System DesignTwo fundamental ideas in system design, particularly in low-level design (LLD), are authentication and authorization. Authentication confirms a person's identity.Authorization establishes what resources or actions a user is permitted to access.Authentication MethodsPassword-based AuthenticationDescr 3 min read Performance Optimization Techniques for System DesignThe ability to design systems that are not only functional but also optimized for performance and scalability is essential. As systems grow in complexity, the need for effective optimization techniques becomes increasingly critical. Data Structures & AlgorithmsChoose data structures (hash tables 3 min read Object-Oriented Analysis and Design(OOAD)Object-Oriented Analysis and Design (OOAD) is a way to design software by thinking of everything as objects similar to real-life things. In OOAD, we first understand what the system needs to do, then identify key objects, and finally decide how these objects will work together. This approach helps m 6 min read Data Structures and Algorithms for System DesignSystem design relies on Data Structures and Algorithms (DSA) to provide scalable and effective solutions. They assist engineers with data organization, storage, and processing so they can efficiently address real-world issues. In system design, understanding DSA concepts like arrays, trees, graphs, 6 min read Containerization Architecture in System DesignIn system design, containerization architecture describes the process of encapsulating an application and its dependencies into a portable, lightweight container that is easily deployable in a variety of computing environments. Because it makes the process of developing, deploying, and scaling appli 10 min read Modularity and Interfaces In System DesignThe process of breaking down a complex system into smaller, more manageable components or modules is known as modularity in system design. Each module is designed to perform a certain task or function, and these modules work together to achieve the overall functionality of the system.Many fields, su 8 min read Unified Modeling Language (UML) DiagramsUnified Modeling Language (UML) is a general-purpose modeling language. The main aim of UML is to define a standard way to visualize the way a system has been designed. It is quite similar to blueprints used in other fields of engineering. UML is not a programming language, it is rather a visual lan 14 min read Data Partitioning Techniques in System DesignUsing data partitioning techniques, a huge dataset can be divided into smaller, easier-to-manage portions. These techniques are applied in a variety of fields, including distributed systems, parallel computing, and database administration. Data Partitioning Techniques in System DesignTable of Conten 9 min read How to Prepare for Low-Level Design Interviews?Low-Level Design (LLD) interviews are crucial for many tech roles, especially for software developers and engineers. These interviews test your ability to design detailed components and interactions within a system, ensuring that you can translate high-level requirements into concrete implementation 4 min read Essential Security Measures in System DesignWith various threats like cyberattacks, Data Breaches, and other Vulnerabilities, it has become very important for system administrators to incorporate robust security measures into their systems. Some of the key reasons are given below:Protection Against Cyber Threats: Data Breaches, Hacking, DoS a 8 min read Design PatternsSoftware Design Patterns TutorialSoftware design patterns are important tools developers, providing proven solutions to common problems encountered during software development. Reusable solutions for typical software design challenges are known as design patterns. Provide a standard terminology and are specific to particular scenar 9 min read Creational Design PatternsCreational Design Patterns focus on the process of object creation or problems related to object creation. They help in making a system independent of how its objects are created, composed, and represented. Creational patterns give a lot of flexibility in what gets created, who creates it, and how i 4 min read Structural Design PatternsStructural Design Patterns are solutions in software design that focus on how classes and objects are organized to form larger, functional structures. These patterns help developers simplify relationships between objects, making code more efficient, flexible, and easy to maintain. By using structura 7 min read Behavioral Design PatternsBehavioral design patterns are a category of design patterns that focus on the interactions and communication between objects. They help define how objects collaborate and distribute responsibility among them, making it easier to manage complex control flow and communication in a system. Table of Co 5 min read Design Patterns Cheat Sheet - When to Use Which Design Pattern?In system design, selecting the right design pattern is related to choosing the right tool for the job. It's essential for crafting scalable, maintainable, and efficient systems. Yet, among a lot of options, the decision can be difficult. This Design Patterns Cheat Sheet serves as a guide, helping y 7 min read Interview Guide for System DesignHow to Crack System Design Interview Round?In the System Design Interview round, You will have to give a clear explanation about designing large scalable distributed systems to the interviewer. This round may be challenging and complex for you because you are supposed to cover all the topics and tradeoffs within this limited time frame, whic 9 min read System Design Interview Questions and Answers [2025]In the hiring procedure, system design interviews play a significant role for many tech businesses, particularly those that develop large, reliable software systems. In order to satisfy requirements like scalability, reliability, performance, and maintainability, an extensive plan for the system's a 7 min read Most Commonly Asked System Design Interview Problems/QuestionsThis System Design Interview Guide will provide the most commonly asked system design interview questions and equip you with the knowledge and techniques needed to design, build, and scale your robust applications, for professionals and newbiesBelow are a list of most commonly asked interview proble 1 min read 5 Common System Design Concepts for Interview PreparationIn the software engineering interview process system design round has become a standard part of the interview. The main purpose of this round is to check the ability of a candidate to build a complex and large-scale system. Due to the lack of experience in building a large-scale system a lot of engi 12 min read 5 Tips to Crack Low-Level System Design InterviewsCracking low-level system design interviews can be challenging, but with the right approach, you can master them. This article provides five essential tips to help you succeed. These tips will guide you through the preparation process. Learn how to break down complex problems, communicate effectivel 6 min read Like