Definition: Cloud Load Balancer operates at layer 4 of the Open Systems Interconnection (OSI) model. It's the single point of contact for clients. Load balancer distributes inbound flows that arrive at the load balancer's front end to backend pool instances. These flows are according to configured load-balancing rules and health probes. The backend pool instances can be Cloud Virtual Machines or instances in a Virtual Machine Scale Set. Source: Microsoft Example: The following implementation is an example on how this specific Architecture Building Block (ABB) can be instantiated as a Solution Building Block (SBB): DIGIT/C Hosting Service - DIGIT/C offers a high availability and high performance hosting infrastructure that is being comprised, among other elements, of back-end web server instances and application servers for hosting and serving both static and dynamic sites. http://ec.europa.eu/ipg/build/infrastructure/index_en.htm eira:iopDimension: Structural IoP LOST view: TVI-Networking Infrastructure Enablers [Traceability] eira:iopSaliency: The Load Balancer ABB is salient for technical interoperability because it provides the functionalities to maintain the traffic to the public administration digital services accordingly with a load that can permit their correct performance. Identifier: http://data.europa.eu/dr8/CloudLoadBalancerTechnologyService eira:ID: http://data.europa.eu/dr8/CloudLoadBalancerTechnologyService ABB name: eira:LoadBalancerTechnologyService EIRA concept: eira:SolutionBuildingBlock Last modification:2026/02/02