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CS6002 Distributed and Internet Systems
Answered

Questions:
Section A
Answer the following question (34 Marks available).
 
1. Cloud computing providers offer their services according to three fundamental models:
 
•  Infrastructure as a Service (IaaS);
 
•  Platform as a Service (PaaS);
 
•  Software as a Service (SaaS).
 
Discuss the characteristics of IaaS, PaaS and SaaS models in cloud computing.
Section B
Answer any two questions in this section. All questions carry equal marks (66 Marks available).
 
1. The wireless IEEE 802.11 Medium Access Control (MAC) layer covers three functional areas:
 
• Reliable data delivery;
 
• Access control;
 
• Security.
 
Discuss these three MAC functional areas in detail.
 
2. a) Describe seven steps that you may take to prevent web browser attack.
 
b) Describe the following network security terminologies:
 
• One factor, two factor and three factor authentications;
 
• Secure Sockets Layer (SSL) and Transport Layer Security (TLS);
 
• Secure/Multipurpose Internet Mail Extensions (S/MIME);
 
• Network Security Toolkit.
 
3. Web servers store the web pages and present them to the client upon request. Three web server attacks are named below:
 
• Input validation attack;
 
• Password-based attack;
 
• Session hijacking.
 
Discuss these three web server attacks in detail. Candidates are warned that possession of unauthorised materials in an examination is a serious assessment offence.

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