Cloud Computing and Distributed Systems Week 5 Answers
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Cloud Computing and Distributed Systems Week 5 Answers
Cloud Computing and Distributed Systems Week 5 Answers (Jan-Apr 2025)
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- Consider the given table of agreement problems and match the correct pair:
a. (P): (i), (Q): (ii), (R): (iii)
b. (P): (iii), (Q): (ii), (R): (i)
c. (P): (iii), (Q): (i), (R): (ii)
d. (P): (ii), (Q): (iii), (R): (i)
- True or False?
“Pease showed that in a fully connected network, it is possible to reach an agreement if the number of faulty processors ‘f’ exceeds (n−1)3\frac{(n-1)}{3}, where nn is the number of processors.”
a. True
b. False
- True or False?
“Byzantine agreement cannot be reached among three processors if one processor is faulty.”
a. True
b. False
- Consider the following statements:
- Statement 1: In the synchronous system model, consensus is impossible to solve.
- Statement 2: In the asynchronous system model, consensus is solvable.
- Statement 3: Paxos provides safety and eventual liveness.
b. Only statement 1 and statement 2 are true
c. Only statement 2 and statement 3 are true
d. Only statement 3 is true
- Find out the correct model for the given assumptions of a system:
- Assumption 1: Each message is received within bounded time.
- Assumption 2: Drift of each process’ local clock has a known bound.
- Assumption 3: Each step in a process takes lb<time<ublb < time < ub, where lblb represents the lower bound and ubub represents an upper bound.
b. Synchronous distributed system
c. On-demand computing system
d. Parallel processing system
Cloud Computing and Distributed Systems Week 5 Answers
- True or False?
“Koo-Toueg algorithm is an uncoordinated checkpointing and recovery technique that takes a consistent set of checkpointing and avoids domino effect and livelock problems during the recovery.”
a. True
b. False
- Messages whose ‘send’ is done but ‘receive’ is undone due to rollback are called:
a. In-transit message
b. Lost messages
c. Orphan messages
d. Duplicate messages
- Cascaded rollback which causes the system to roll back too far in the computation (even to the beginning), in spite of all the checkpoints, is known as:
a. Rollback
b. Phantom Effect
c. Domino Effect
d. Livelock problem
- Messages with ‘receive’ recorded but message ‘send’ not recorded and do not arise if processes roll back to a consistent global state are called:
a. In-transit message
b. Lost messages
c. Orphan messages
d. Duplicate messages
- The ______________ may arise when a process rolls back to its checkpoint after a failure and requests all the other affected processes also to roll back.
a. Rollback
b. Phantom Effect
c. Domino Effect
d. Livelock problem
Cloud Computing and Distributed Systems Week 5 Answers (Jan-Apr 2025)
For answers to others Nptel courses, please refer to this link: NPTEL Assignment