Basics of Network Load Balancer (NLB)
A load balancer helps as the single point of contact for clients. The load balancer allocates incoming traffic across several targets. They direct systems and individual servers in a network based on factors such as server processor utilization, number of connections to a server or overall server performance. Load balancers are used at organizations to minimize the chance that any specific server will be overwhelmed and to enhance the bandwidth available to each computer in the network.
A Network Load Balancer functions at the fourth layer of the Open Systems Interconnection (OSI) model. It can handle millions of requests per second. After the load balancer receives a connection request, it selects a target from the target group for the default rule. It attempts to open a TCP/IP connection to the designated target on the port specified in the listener configuration.
A load balancer can be applied as a security software or hardware solution, and it is usually associated with a device such as a router, a firewall etc. A load balancer distributes the traffic intended for a website into individual requests that are then rotated to redundant servers as they become available.
A key issue with load balancers is scheduling i.e. defining how to split up the work and distribute it across servers or devices.
- It has capability to handle volatile workloads and scale to millions of requests per second.
- Network health and Optimization.
- Fault Tolerance
- Cost and Performance benefit
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