Principles of Dependable Systems

Useful Links

http://tu-dresden.de/die_tu_dresden/fakultaeten/fakultaet_informatik/sysa/se/teaching/courses/ws/principles_of_dependable_systems/ws13

Past Exams

PODS Mid-Exam WS 2014/2015

• What is a system failure? (3p.)
• Graph of Limiting Scheduled Downtime - put on the graph 4 kind of systems.
• Continuos operation. (3p.)
• What is a main problem of UNCP-store? (3p.)
• Short code wih VRO points and answer on which point application will be stopped.
• What does scrubbing? (5p.)
• Control flow graph - count expected signatures.
• Protect cache with parity, not with ESS, data stored in both RAM/cache, RAM protected with ECC (3p.)
• Described some problem and question which kind of redundancy would help in this situation. (3p.)
• correct or stop (3p.)
• How many bit flipst can detect parity?

PODS Exam WS 2014/2015

3 assumptions of Monotonic Perfect Failure Detector. Triple Modular Redunadancy Draw schema of memory. Describe 4 methods of memory's protections - 2 hardware and 2 software.