Test Prep Resources for the CompTIA A+ Core Series Exam

The Open Systems Interconnection (OSI) model is a conceptual and logical model that defines network communication. This model contains various layers that consist of a variety of networking and computing protocols needed for interconnectivity with the layers above and/or below it. This hierarchical framework was created and developed in the 1970s by the International Organization for Standardization (ISO). Layer 7 - Application layer The application layer is considered the highest level of the OSI model, and it provides an interface gateway for users to access other network services or ap...