In the context of the ISO Reference model for OSI explain br

In the context of the ISO Reference model for OSI, explain briefly, with the aid of sketches where appropriate: a) The meaning and interrelationship of the terms network environment, open systems environment and real systems environment b) The difference between a user name (title) and a full qualified address c) How the overhead associated with a user message increases as the message passes down through each protocol layer prior to transmission and decreases as it passes up through the layers on reception

Solution

a)Network Environment: Network Activity involves transfering data from one system to other.This process can be broken into discrete and seuential tasks.System must recognize data,divide data into manageable chunks,add information to each chunk of data to determine the location of the data and to identify receiver,add timing and error checking information,put the data on the network and send it on its way.

Open System Environment: It forms an extensible framework that allows services,interfaces,protocols and supporting data formats to be defined in terms of nonpropreitary specifications that evolve through open,consensus-based forus.

Real System Environments: In real time, we can transfer data to another machine through LAN.This data divided into chunks,This data will be transered with security and it will reach destination safely.

b)User name contains only name of the title.

Full qualified address contains username and domain name.

c)In OSI model,user message increases as message passes down through each protocol layer because message is divided into parts while transmitting and decreases as it passes up through the layers on reception because total message is recieved at a time.