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PROGRAM
Master
of Science in Information Technology (MSc IT)Revised Fall 2011
SEMESTER
3
SUBJECT
CODE & NAME
MIT3032–
Distributed Operating System
Qus:1
Explain (a) tightly coupled systems (b) loosely coupled systems.
Ans:
(a)
Tightly coupled systems:
In tightly
coupled systems, there is a single system wide primary memory (address
space) that is shared by all the processors. If any processor writes, for example,
the value 100 to the memory location x, any other
Qus:2
Write a note on Distributed Algorithms.
Ans:
Distributed
Algorithms:
We know that externally
synchronized clocks are also internally synchronized. That is, if each node’s
clock is independently synchronized with real time, all the clocks of the
system remain mutually synchronized.
Qus:
3 List and explain the desirable features of a good message passing system.
Ans:
The
desirable features of a good message passing system:
Desirable
features of a good message passing system are:
·
Simplicity
·
Efficiency
·
Reliability
·
Correctness
·
Flexibility
·
Security
·
Portability
Simplicity:
The message
Qus:4
Explain the object locating mechanisms.
Ans:
The
object locating mechanisms:
Object locating is
mapping the system oriented names of objects to the location of the object.
Some object
Qus:5
(a) Explain any two approaches to replication in a DFS.
(b)
What is Ceph? Explain.
Ans:
(a)
Explain any two approaches to replication in a DFS:
1. Explicit replication: The client
explicitly writes files to multiple servers. This approach requires explicit support
from the client and does not provide transparency.
2. Lazy file replication: The
server
Qus:6
(a) What is key management in cryptography? Explain.
(b)
Explain the means of authentication
Ans:
(a)
What is key management in cryptography? Explain.
Key management is
the set of techniques and procedures supporting the establishment and
maintenance of keying relationships between authorized parties.
Key
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