![]() These appliances are built from customized Application-Specific Integrated Circuits (ASICS) and Field-Programmable Gate Arrays (FPGA) to help distribute traffic across multiple servers on a network. Hardware Load Balancers-also called Hardware Load Balancing Devices (HLD’s)-are rack-and-stack hardware appliances. There are two primary flavors of load balancers: Hardware Load Balancers (HLBs) and Software Load Balancers (SLBs). Hardware vs Software-Based Load Balancers However, that’s rarely an issue with modern, powerful servers. They can also be more expensive than L4 LBs in terms of computing power and latency. ![]() Unlike L4 LBs, L7 LBs can make intelligent load balancing or traffic distribution decisions. For instance, L7 LBs have the ability to identify video streaming requests and forward them to specific servers that have high GPU. They terminate the TCP connection from the original source and re-establish the connection with a backend server selected based on the packet content. Operating at the application layer, Layer 7 load balancers have access to the actual content of the data packets. Their input and output are mostly the same, which means that they do not manipulate the packet content. They simply act as an intermediary for forwarding the packets between the source and the destination. Layer 4 load balancers do not have access to the content of the data packets and deliver requests based on the source and destination IP addresses specified in the first few packets of the TCP stream. Layer 4 load balancers (L4 LBs or TCP/UDP LBs) operate at the intermediate transport layer, whereas the Layer 7 load balancers (L7 LBs or HTTP LBs) operate at the highest level-the application layer. ![]() There are seven networking layers in the Open Systems Interconnection (OSI) model. Load balancers improve the performance of shared applications and desktops by distributing the network traffic on multiple servers, as well as by distributing application-specific tasks on each server individually. ![]() ![]() Load balancers are utilized to increase the capacity (concurrent users) and reliability of applications. A load balancer is an appliance that could be physical or virtual and acts as a proxy to distribute network traffic across several servers. ![]()
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