> 030001T306052002 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Sixth semester B.Tech degree examinations (S), September 2020

Course Code: IT306
Course Name: Distributed Systems

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 ஐ What are the advantages of mobile agents in distributed system? (3)

b) Compare synchronousdistributed systems withasynchronousdistributed (4)

systems.
c) What are the two key examples of kernel design? Compare them. (8)
2 9) Describe any two external data representation methods (8)
b) Explain the working of RPC with neat diagram. (7)
3 a) What is the role of proxy and skeleton in RMI. (4)

b) What is an execution environment? Explaintwo independentaspects of (8)

creating a new process.

c) What are thevarious threading architectures? (3)
PART 13
Answer any two full questions, each carries 15 marks.
4 9) Describe about file service architecture with a neat diagram. (8)
b) Explain how Berkeley algorithm helps in internal synchronization. (7)
5 2) Compare logical clocks and vector clocks. (5)
b) Define events, process states and clocks. (3)
c) State the responsibilities of DNS name server and DNS queries. (7)
6 a) State the importance of safety and liveness in global state predicates. (4)
b) Explain how process states are collected. (3)

௦) Explain the industry standard for securing intranet servers against (5)
unauthorised access and imposter attack.

d) List file system modules. (3)

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