How application delivery controllers work?

The developers who are building business applications need an IT environment that allows them to work quickly and with full security. So need to have web servers that are always available and protected. In today’s agile world, organizations are facing challenges in delivering critical applications to the users. Companies are adopting appropriate networking technologies to gain efficiency. The evolution of modern applications is due to higher dependency on cloud and mobile technologies. When they have to deliver a variety of functions across networks. They also need applications that are high in performance to deliver solutions. Always IT team can't wait to set up and configure load balancers and Application Delivery Controllers ( ADCs) for them. They need to have solutions for their needs.

Application Delivery Controllers ( ADCs) provides security and access to applications at peak times. It provides load balancing, application acceleration, and SSL termination along with seamless access to applications. It is also known as app delivery controllers and makes online applications such as websites, e-commerce sites, etc. It uses various techniques to improve the performance of web applications.  Being a network appliance, this also optimizes and manages how the enterprise and web servers are connected with the client machines.

Companies are trying hard towards creating user-friendly business applications. They are ensuring that employees can access information whenever and wherever they need it. Application Delivery Controllers (ADCs) heavily rely on business environments. They adapt applications to current protocols and networks ensuring the application's security, performance, and availability. Earlier they had limited functionality but now the core functionality is provided by load balancers.

Application delivery primarily functions as a load balancer that manages traffic to servers, optimizes the end-user performance, application deployment, reliability, and security of enterprise applications.  It also performs other functions like caching, compression, traffic shaping, multiplexing, etc. It is placed behind the firewall and in front of one or more application servers to act as a single point of control that can deliver the security needs of the application. The following techniques are mostly used by Application delivery controllers (ADCs) to enhance application performance:

• Load balancing:  It refers to distributing incoming requests across a group of servers. The algorithms consider factors such as server capacity, type of content requested, fields in the HTTP header, the client location, etc. to improve performance.
• Caching: It stores the content locally on ADC instead of fetching it from the backend servers every time a client request it. It increases the speed of delivery and reduces server loads.
• Compression:  Static assets like images, music, videos, JavaScript code are compressed to speed delivery and increase network capacity.
• Offloading SSL processing: It replaces the backend servers at the SSL endpoint for connections with the client. It performs the decryption of requests and encryption to work for servers to deliver content by freeing up servers for other tasks.

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