 |
DTS620S - DISTRIBUTED SYSTEMS - 2ND OPP - JAN 2024 |
|
|
1 Page 1 |
▲back to top |
nAmlBIA UnlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF COMPUTING AND INFORMATICS
DEPARTMENTOF COMPUTERSCIENCE
QUALIFICATION:BACHELOROF COMPUTERSCIENCE,SYSTEMSADMINISTRATION
QUALIFICATIONCODE: 07BACS
LEVEL:6
COURSENAME: DISTRIBUTEDSYSTEMS
COURSECODE:DTS620S
DATE:JANUARY2024
PAPER:THEORY
DURATION: 2 HOURS
MARl{S: 70 (100%)
SECONDOPPORTUNITY/SUPPLEMENTARYEXAMINATION QUESTIONPAPER
EXAMINER
MODERATOR
MS ALBERTINASHILONGO
PROF. JOSE QUENUM
INSTRUCTIONS
1) Answer ALL the questions on the answer scripts provided.
2) Be guided by the number of marks allocated when answering the questions.
3) Write clearly and neatly.
4) Show all your calculation/work.
5) Number your questions clearly.
THIS QUESTION PAPERCONSISTSOF 3 PAGES(Including this front page)
1
|
|
2 Page 2 |
▲back to top |
Question 1:
[16 Marks]
a) Why is openness a major characteristic of distributed system design and what is it concerned
with?
(4)
b) List and explain 3 communication paradigms in distributed systems.
(6)
c) Explain what the stub is in RMI in distributed applications and the tasks it performs.
(6)
Question 2
[35]
a) Outline 4 advantages of HDFSover traditional databases.
(4)
b) Distinguish the key idea between the Vector's clock and Lamport's logical clocks algorithm and
how its key ideas are applied in distributed systems.
{10)
c) Explain the importance of scalability in distributed systems and how hardware and software
scalability is applied.
(6)
d) Explain the concept of synchronization amongst processes in distributed file systems during
message passing.
(4)
e) List 3 security mechanisms to implement security policies in distributed systems?
(4)
f) Differentiate between Concurrency and Location transparency
(4)
g) List any three {3} characteristics of early distributed system devices.
(3)
Question 3
[Total: 19]
a) How would you use the four key security mechanisms used to implement security policies in
distributed systems.
(10)
b) Hotel XYZwhich has been serving a popular breakfast on its ground floor. Due to increased
publicity the hotel guests become more and that forced the hotel to expand its hotel floors by
5 more floors each with a capacity of 20 rooms from the initial 7 floors.
Subsequently, 2 more floors were added too. That extended the strain on the hotel kitchen
2
|
|
3 Page 3 |
▲back to top |
resources and their elevators were always congested during breakfast times mostly. Figure
1 is a representation of the hotel story and what each component of the hotel could
represent in terms of distributed systems.
Storage
Network
i. Select appropriate techniques in isolation or in combination to achieve a scalable
the solution to the given challenge in Figure 1.
ii. Select appropriate techniques in isolation or in combination to achieve a scalable
the solution to the given challenge in Figure 1.
(9)
Exam Ends
Total 70 Marks
3