M.Sc. (Semester IV) (CBCS) Examination Mar/Apr-2018
Computer Science
DISTRIBUTED OPERATING SYSTEM
Time: 2½ Hours
Max. Marks: 70
Instructions: Q. No. and Q. No are compulsory. Attempt any three from Q. No. to Q. No. Figures to the right indicate full marks.
Q.1

Choose correct alternative:
10
need radically different software than centralized systems do.
Network Operating System
Operating Systems
Distributed Systems
None of these
If the system is the users will not notice existence of other users.
Location transparent
Migration transparent
Parallelism transparent
Concurrency transparent
A system is one that is prepared to communicate with any other system by using formalized rules called protocols.
Closed and Open
Open and Closed
Open and Open
Closed and Closed
When a process calls it specifies a destination and a buffer to to that destination.
Receive
Send
Block
Non-Block
The sending of message from single sender to a single receiver is called
Uni-casting
Multicasting
Broadcasting
None of these
The property ensures that each transaction either happens completely, or not at all, and if it happens, it happens in a single indivisible, instantaneous action.
Atomicity
Consistent
Isolated
Durable
The strategies allow better load balancing, they are more complex and have a major impact on system design.
Migratory
Unstable allocation
Non-migratory
None of these
The NIST stands for
National international Standard time
National Internet Standard time
National Institute of Standard Time
National Indian Standard Time
The specifies the file system's interface to the clients.
File Control Block
File Service
File importer
File Server
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SLR-UG-288
10) interface is a window system with a pointing device to direct choose menus and make selections and a keyboard to enter text.
I/O
Batch
Command line
Graphical user

State True or False:
04
Device sharing allows user to share expensive peripherals like colour printers.
In loosely coupled system, the inter-machine message delay is short and data rate is high.
In OSI model, communication is divided up into seven levels or layers.
In closed group outsiders can send messages to the group as a whole.
Q.2

Write short notes on:
08
Two Phase Locking Protocol
Happens-Before Relation

Answer the following:
06
What do you mean by request-reply layer?
What do you mean by process?
Q.3

What do you mean by multi-computers? State and explain in detail advantages and disadvantages of Distributed OS?
07

Discuss in detail Token ring algorithm to achieve Mutual Exclusion in Distributed OS.
07
Q.4

What is mean by System Model? Discuss scheme of diskful and diskless workstation.
07

What do you mean by Deadlock? Discuss in detail centralized deadlock detection with suitable example.
07
Q.5

What do you mean by Thread? Explain in detail concept of thread usage.
07

Discuss in detail comparison of MS-Windows NT and Novel Netware.
07
Q.6

Define the term Operating System. Explain in detail principle of demand paging with suitable example?
07

What is meant by Distributed File System? Discuss in detail the aspects of file service interface.
07
Q.7

Discuss in detail concept of Remote Procedure Call with suitable example.
07

State and explain in detail various Election algorithms with suitable example.