辅导案例-COMP90024
COMP90024 Cluster and Cloud Computing, 2016
Student Number_____________
Faculty/Dept. Computing and Information Systems
Subject Number COMP90024
Subject Name Cluster and Cloud Computing
Writing Time 2 hours
Reading Time 15 minutes
Open Book Status Closed Book
Number of pages (including this page) 3
Authorised Materials: None
Instructions to Students: This examination is worth 50% of your final mark
Answer 5 out of any 7 questions. Please note that only the first 5 questions
will be marked.
Each question carries 10 marks.
The number in square brackets after each sub-question represents the
marks allocated to it.
Instructions to Invigilators: Please provide students with standard script books
No calculators are allowed
This paper is NOT to be made available in the library after the examination
Paper to be held by Baillieu Library: Indicate whether the paper is to be held with the Baillieu Library.
Yes No X
Extra Materials required (please tick & supply)
Graph Paper Multiple Choice form

COMP90024 Cluster and Cloud Computing, 2016
Question 1:
A) Cloud computing does not solve the fundamental challenges associated with large-scale distributed
systems. Discuss. [8]
B) How has the evolution of service-oriented architectures supported Cloud computing? [2]

Question 2:
A) Define Gustafson-Barsis’ law for scaled speed-up of parallel programs. [2]
B) A parallel program takes 120 seconds to run on 8 processors. The total time spent in the sequential
part of the program is 12 seconds. What is the scaled speedup? [2]
C) According to Gustafson-Barsis’ law, how much faster could the application theoretically run if it ran
across all 8 processors compared to running on a single processor? [2]
D) Why is theoretically italicized in the above? [4]

Question 3:
A) Big data is often associated with data having a range of properties including high volume, high
velocity and high variety (heterogeneity). Discuss the advantages, disadvantages and suitability more
generally of the following data solutions with regards to these big data properties:
a. CouchDB [3]
b. Apache Hadoop Distributed File System (HDFS) [3]
c. Apache Spark [3]
Your answer should include the way in which these solutions implement MapReduce.
What other data properties can be associated with big data challenges? [1]
Question 4:
A) Representational State Transfer (ReST) based web services are often used for creating Resource-
oriented Architectures (ROA) whilst Simple Object Access Protocol (SOAP)-based web services are
often used to implement Service-oriented Architectures (SOA). Discuss the similarities and
differences between a ROA and a SOA. [3]
B) Discuss the advantages and disadvantages of ReST vs SOAP for web services more generally. [5]
C) HTTP methods can be safe or idempotent. What is meant by the italicized terms, and give an
example of each? [2]

Question 5:
A) Popek and Goldberg laid down the foundations for computer virtualization in their 1974 paper,
Formal Requirements for Third Generation Architectures.
a. Identify and explain the different types of classification of instruction sets for virtualization
to occur according to the theorem of Popek and Goldberg. You should include the
relationships between the instruction sets. [3]
b. Describe how these principles are realized by modern virtual machine monitors/hypervisors.
[2]
c. Explain the differences between full virtualization and para-virtualisation. Give an example
of a hypervisor that uses full virtualization and an example of a hypervisor that uses para-
virtualisation. [2]
d. Describe the role of a virtual machine manager/hypervisor with regards to memory
management and shadow page tables. [3]

Please Turn Over
COMP90024 Cluster and Cloud Computing, 2016
Question 6:
A) Explain what is meant by the following security terms:
• single sign-on [1]
• federated authentication [1]
• authorization [1]
• certification authority [1]
• identity provider [1]
B) Discuss the challenges in supporting finer-grained security in hybrid Cloud environments. You may
refer to the importance and/or role of (some of) the terms in part A) of this question. [5]

Question 7:
A) The NeCTAR Research Cloud is based on the openStack technology.
a. Describe the role and features of the following openStack components:
i. Nova [1]
ii. Swift [1]
iii. Glance [1]
iv. Keystone [1]
b. Describe the interplay between these components that allows a researcher to create an
instance of a virtual machine through a pre-existing snapshot. [3]
B) The NeCTAR Research Cloud has multiple availability zones.
a. What is meant by the term: availability zone? [1]
b. What are the implications of availability zones with regards to virtual machine instance
creation and data volumes offered by NeCTAR? [2]



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