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What is Network Load Balancing (NLB)

Network Load Balancing (NLB) is a technology used to distribute workloads across multiple servers in a network. It is used to ensure that no single server is overburdened with requests and to maximise the performance of the network infrastructure. NLB works by distributing traffic among multiple servers, which can be located in different physical locations. This ensures that the workload is spread evenly and no single server is overburdened with requests. NLB is an essential tool for businesses that must ensure their networks run efficiently and support large amounts of traffic.

Thanks to network load balancing, your incoming traffic is automatically split among numerous targets, such as EC2 instances and IP addresses, in one or more Availability Zones. It checks the health of its registered targets and routes traffic exclusively to the healthy targets. Your load balancer is scaled due to network load balancing as your incoming traffic changes. 

A network load balancer works on 4 layers of open Systems Interconnection (OSI) layers. Millions of queries can be handled per second. The load balancer chooses the target for the default rule after it gets a connection request from a target in the target group. On the port given in the listener configuration, it tries to establish a TCP connection to the chosen target.

Network Load Balancing works by distributing traffic among multiple servers. When a request is made to the network, the NLB will detect the incoming traffic and determine which server is best suited to process the request. This is done by monitoring the load on each server and then distributing the load across the servers that have the least amount of traffic. It allows the network to evenly distribute the load evenly, ensuring that each server is running optimally and that no single server is overburdened.

Application, network, gateway, and classic load balancers are all supported by network load balancing. The load balancer type that best meets your demands can be chosen. In this manual, network load balancers are covered. 

NLB can also be used to improve the availability of a network. Distributing traffic across multiple servers allows the network to remain available even if one server fails or becomes unavailable. It will ensure that the network remains operational even in a server failure. NLB also provides redundancy, allowing the network to remain operational even if one or more servers become unavailable.

NLB is an essential tool for businesses that must ensure their networks run efficiently and handle large amounts of traffic. It can be used to enhance the performance of the network infrastructure, ensuring that the network remains available and operational even when one or more servers become unavailable. NLB can also be used to improve the network’s security, as it can help prevent malicious attacks from being successful.

When setting up NLB, it is essential to consider the type of traffic that will be sent through the network. It ensures that the NLB is configured correctly and that the traffic is distributed among the servers efficiently. It is also essential to consider the type of hardware that will be used to run the NLB. Different types of hardware can be used to run NLB, such as switches, routers, and load balancers.

NLB can be used to improve the network infrastructure’s performance and ensure that the network remains available and secure. It is an essential tool for organizations to ensure their networks run efficiently and handle large amounts of traffic. NLB can be used to improve the network’s security, as it can help prevent malicious attacks from being successful. By configuring NLB correctly, businesses can ensure that their networks are running optimally and can support large amounts of traffic.

Using a flow hash algorithm, the load balancer chooses a target for TCP traffic based on the protocol, source IP address, destination port, and TCP sequence number. A client’s TCP connections can be routed to many targets with multiple source ports and sequence numbers. Each unique TCP connection is routed to a single destination for the duration of the connection.

Moreover, using a flow hash algorithm, the load balancer chooses a target for UDP traffic based on the protocol, source IP address, source port, destination IP address, and destination port. A UDP flow is always directed to the same target because it has the same source and destination throughout its lifespan. Various UDP flows have various source IP addresses.

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