a.It is responsible for linking the application layer software to the network and establishing end-to-end connections between the sender and receiver when such connections are needed. b.It breaks long messages into several smaller messages to make them easier to transmit. c.Detect lost messages and request that they be resent.
5.Application Layer. This is the application software used by the network user. With this layer the user defines what messages are sent over the network. Examples of this layer are the internet explorer and web pages.