Infrared wireless port when updating a pda from

31-Oct-2019 14:19

Networking operating system services interface to the network via the kernel and contains complex algorithms to deal with transparency, scheduling, security, fault tolerance, etc.They provide peer-to-peer communication services and user applications directly access the services, or the middleware. Protocol is a "well-known set of rules and forats to be sued for communications between processes in order to perform a given task".Data and control pass from higher to lower layers, across the physical medium and then back up the network stack on the other machine.As a message is passed down the stack, each layer adds a header (and possibly a tail such as a checksum, although this is most common at the bottom of the stack) and passes it to the next layer.

Messages are addressed to communication ports attached to processes.Protocols specify the sequence and format of messages to be exchanged.