Dependable Architechtures

Question 1

What are the 6 attributes of a dependable system?

Answer 1

• Availability
• Reliability
• Saftey
• Confidentiality
• Integrity
• Maintainability

Question 2

What is avialibility (Dependability)?

Answer 2

The likeliness that a service provided by a computer system is ready for use when invoked

Question 3

What is reliability (Dependability)?

Answer 3

A measure of how likely the system is to provide its designated service for a specified period of time

Question 4

What is Saftey (Dependability)?

Answer 4

The extent to which a system can operate without damaging or endangering its environment

Question 5

What is Confidentiality (Dependability)?

Answer 5

Concerned with the nondisclosure of undue information to unauthorised entities

Question 6

What is Integrity (Dependability)?

Answer 6

The capacity of a computer system to ensure the absence of improper alterations with regard to the withholding modification or deletion of information

Question 7

What is Maintainability (Dependability)?

Answer 7

Defined as a function of time representing the probability that a failed computer system will be repaired in t time or less

Question 8

What are 3 methods of providing dependability?

Answer 8

• Fault Avoidence - develop to preven faults
• Fault Tolerance - design system to manage faults
• Fault detection and correction - disover and remove faults before deployment