DS[cs-504]Dec-2007

Roll No. ...................... Total No. of Questions: 08] [Total No. of Pages: 02
PaperID [CS504] (please fill this Paper ID in OMR Sheet)
M.Tech. 'DISTRIBUTED SYSTEM (CS-504)
Time: 03 Hours Maximum Marks: 100
Instruction to Candidat~s:
1)
2)
Attempt any Five questions.
All questions carry equal marks.
Ql) a) In a certain workstation-based system, the workstations have local disks
, that hold the system binaries. When a new binary is released, it is sent to
each workstations. However, some workstations may be down (or switched
off) when this happens. Devise an procedure that allows the updating to be
done automatically, even though workstations are occasionally down.
b) The terms loosely-coupled system and tightly-coupled system are often
used to describe distributed computer systems. What is the different between
them.
Q2) a) When a Private workspace is used to implement transactions, it may happen
that a large number of file indices 'must be copied back to the parent's
workspace. How can this be done without introducing race conditions?
b) What is a kernel in distributed operating system. Explain with example of
an OS. .
Q3) a) What are the feature of CORBA. Discuss
b) Why do stateless servers have to include a file offset in each request? I this
also needed for stateful servers?
Q4) a) What is the difference between a file service using the upload/download
model and one using the remote access model.
b) A file system allows links from one directly to another. In this way, a
directory can "include" a subdirectory. In this context, what is the essential
criterion that distinguishes a tree-structured directory system from a general
graph-structured system?
Q5) a) Name two useful properties that immutable files have.
b) Why do some distributed systems use two-level naming?
Q6) a) How resource management is done in a distributed multimedia system.
. Explain
b) How memory management is done is a distributed system. -Explain with the
help of an Example. -
Q7) What is a deadlock in distributed systems. How it can be prevented.
Q8) Write short notes on
a) Client server Communication
b) Distributed transactions