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Questions and Answers
What is the primary function of a system administrator?
Which processing mode entails all processing being performed by a single computer?
How is system availability calculated?
Which of the following is not a component of RASIS?
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What does the term MTTR stand for in the context of system serviceability?
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Which processing mode involves distributing tasks among multiple connected computers?
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Which component of RASIS measures the normal operation time of a system?
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What does the formula for availability (A) represent?
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Which of the following best describes security in the context of RASIS?
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What does the Mean Time To Repair (MTTR) indicate within system serviceability?
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Study Notes
Information Systems
- A computer system within a company or organization used for sharing information.
Client/Server System
- Client: A computer that receives a service; includes terminal devices.
- Server: A computer that provides a service; includes host computers.
Processing Modes
- Centralized Processing: All processing done by a single computer.
- Distributed Processing: System where processing is divided between multiple connected computers on a network.
System Administrator
- Someone who maintains the systems used by others, ensuring smooth and efficient operation for users.
RASIS
- Measures system safety and efficiency.
- Reliability: Measured by MTBF (Mean Time Between Failures); essentially the normal operation time.
- Availability: Ratio of possible usage of the system; calculated as A = MTBF / (MTBF + MTTR).
- Serviceability: Ease of maintaining the system, computed as MTTR (Mean Time To Repair), representing the down time.
- Integrity: Preventing data corruption.
- Security: Ensuring the security of data.
System Reliability
- Ensuring the system continues operating without interruptions (no functions halting).
- MTBF = Mean Time Before Failure
System Availability
- Percentage denoting uninterrupted availability.
Availability for Simple Systems
- Availability = MTBF / (MTBF + MTTR)
- MTBF: Average time for continuous system operation.
- MTTR: Average time to repair the system if it fails.
Availability Calculation Example
- Example shown of calculating availability using MTBF and MTTR values.
Complex Systems
- Series Systems: System functions only if all components are operational (Availability = A1 × A2).
- Parallel Systems: System functions as long as at least one component is operational (Availability = 1 − (1 − A1) × (1 − A2)).
Additional Example
- A LAN system example with two PCs, one file server, and a printer is given. Availability for each component is provided (0.9 for file server and printer, 0.8 for each PC) and the system operates if at least one PC is operational.
Communication Systems
- Figures are used to represent a configuration for communication between two sites.
- Units (E to H) form communication paths.
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Description
Test your knowledge on information systems, client/server architectures, and processing modes. This quiz covers essential concepts including system administration and reliability metrics. Perfect for students and professionals looking to refresh their understanding.
