Correct Answer - Option 1 : Mach message system
A messaging system is responsible for transferring data from one application to another.
Mach message system
Mach maps the address space containing the sender's message into the receiver address space. The message itself is not copied.
Half-duplex Mode
Half-duplex data transmission means that data can be transmitted in both directions on a signal carrier, but not at the same time.
Example of half-duplex is a walkie- talkie in which message is sent one at a time but messages are sent in both the directions
Full-duplex Mode
In a full-duplex system, we can send data in both directions as it is bidirectional at the same time, in other words, data can be sent in both directions simultaneously.
An example of Full Duplex is a Telephone Network in which there is communication between two persons by a telephone line, using which both can talk and listen at the same time.
Packet switching:
Individual message is divided into packets each of which travels independently through the network. Packets are dispatched from source and reassembles at the point of exit for the destination.
