Osmania University (OU) 2010-2nd Year M.C.A , II Semester , - Question Paper

Code No : 6821



FACULTY OF INFORMATICS
M.C.A. II YEAR, II Semester (Main/Backlog) Examination, July 2010
DISTRIBUTED SYSTEMS(Elective - I)

Time : three Hours ] [Max. Marks : 80

Note : ans 1 ques. from every unit. ALL ques. carry equal marks

UNIT-I
1. elaborate the properties of adaptive software agents ? Where do Agent communication
Language(ACLS) fit into the OSI model ? Why is it often necessary to specify the ontology in
an ACL message ?
OR
2. discuss how micro kernels can be used to arrange an operating system in a client server
fashion.

UNIT-II
3. discuss the concept of removing unreferenced entities.
OR
4. What is the idea behind optimistic concurrency control ? elaborate its advantages ? Is
optimistic concurrency control more or less restrictive than using times stamps ? explain.

UNIT-III
5. discuss about distribution and consistency protocols.
OR
6. discuss concept of distributed commit and recovery.

UNIT-IV
7. (a) Write short notes on (i) CORBA and (ii) DCOM.
(b) Mention the design goal of Globe. provide an overview of globe.
OR
8. Compare NFS and CODA distributed file systems on major design problems.

UNIT-V
9. discuss about (i) Coherence protocols.
(ii) Design problems.
OR
10. discuss about (i) problems in Load distributing.
(ii) Load distribution algorithms.

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(This paper contains one page)

Earning:   Approval pending.