The distributed system is a collection of _____(P)_____ and communication is…
2015
The distributed system is a collection of _____(P)_____ and communication is achieved in disributed system by ____(Q)____, where (P) and (Q) are:
- A.
Loosely coupled hardware on tightly coupled software and disk sharing, repspectively
- B.
Tightly coupled hardware on loosely coupled software and shared memory, repspectively
- C.
Tightly coupled software on loosely coupled hardware and message passing, repspectively
- D.
Loosely coupled software on tightly coupled hardware and file sharing, repspectively
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Correct answer: C
Answer: Tightly coupled software on loosely coupled hardware and message passing.
Explanation:
Hardware is loosely coupled: the system is made of independent machines (nodes) connected by a network; they do not share physical memory and can fail independently.
Software is tightly integrated: the distributed software coordinates components so the collection of machines appears as a single coherent system to users.
Communication is by message passing: because nodes do not share memory, processes exchange information by sending and receiving messages over the network.
Why other mechanisms are not correct: shared memory or disk/file sharing imply tighter coupling or specialized shared resources and do not represent the fundamental communication model for distributed systems; they are less general and less scalable than message passing.
Mapping to the given choices: the statement that lists tightly coupled software together with loosely coupled hardware and names message passing as the communication method is the correct description of a distributed system.