Network and Security- Foundations Key Compulsory Exam Questions And 100% CORRECT Answers

Application Layer (Layer 7)This layer is responsible for network applications (like HTTP or FTP) and their production of data to be transferred over the network. Presentation Layer (Layer 6)This layer is responsible for translating data from the application layer into the format required to transmit data over the network as well as encrypting the data for security if encryption is used. Session Layer (Layer 5)This layer is responsible for connection establishment, session maintenance, and authentication. Transport Layer (Layer 4)This layer provides services to the application layer and receives services from the network layer. It is responsible for the reliable delivery of data. It segments and reassembles data in the correct order for it to be sent to the receiving device. It may also handle the reliable delivery of data and any retries of data that are lost or corrupt (for example, TCP does this). "The heart of OSI"