Load Balancer — IT Glossary | ITU Online IT Training
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Load Balancer

Commonly used in Networking, General IT

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A load balancer is a device or software that distributes network or application traffic across multiple servers to improve performance, increase capacity, and enhance reliability. It ensures that no single server becomes overwhelmed, enabling smooth handling of large volumes of user requests.

How It Works

Load balancers operate by receiving incoming traffic from users or clients and then distributing these requests to a pool of backend servers based on predefined algorithms. Common algorithms include round-robin, least connections, and IP-hash, which determine how requests are allocated to optimize resource utilization. The load balancer can be positioned either at the network perimeter, acting as a reverse proxy, or within the network to manage internal traffic. It continuously monitors server health and performance, rerouting traffic away from failed or underperforming servers to maintain service availability.

Common Use Cases

  • Distributing web traffic across multiple web servers to handle high volumes of visitors.
  • Balancing application requests in cloud-based environments to ensure scalability.
  • Providing high availability for critical services by rerouting traffic away from failed servers.
  • Managing SSL termination to offload encryption processing from application servers.
  • Implementing session persistence to ensure users maintain their connection to a specific server during a session.

Why It Matters

Load balancers are essential for maintaining the performance, scalability, and reliability of modern applications and websites. They enable IT professionals to design systems that can handle fluctuating traffic loads without degradation of service. For those pursuing certifications in networking, cloud computing, or systems administration, understanding load balancing concepts is fundamental for designing resilient infrastructure. It also plays a key role in disaster recovery strategies and continuous availability planning, making it a critical component of enterprise IT architectures.

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