NPTEL Cloud Computing and Distributed Systems Week 7 Assignment Answers 2025
1. Which of these P2P system uses a 1 hop Lookup DHT (Distributed Hash Table) ?
- CAN
- CHORD
- Kelips
- Gnutella
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2. Peer-to-peer (P2P) network systems use ___________________organization of the network overlay for flexibly sharing resources (e.g., files and multimedia documents) stored across network-wide computers.
- Physical-level
- Network-level
- Transport-level
- Application-level
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3. What is the characteristic of P2P network ?
- Fault Tolerance
- Self-Adaptation
- Dealing with instability
- All of the mentioned
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4. Choose the correct items for X, and Y.
The Map phase is subdivided into M pieces and the reduce phase into R pieces. There are practical bounds on how large M and R can be, since the master must make X scheduling decisions and keeps Y state in memory.
- X: O(M + R), Y: O(M * R)
- X: O(M * R), Y: O(M * R)
- X: O(M + R), Y: O(M + R)
- X: O(M * R), Y: O(M + R)
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5. Consider the given table of P2P systems and find out the correct match:
- (P): (i), (Q): (ii), (R): (iii), (S): (iv)
- (P): (iii), (Q): (iv), (R): (i), (S): (ii)
- (P): (iv), (Q): (iii), (R): (i), (S): (ii)
- (P): (iii), (Q): (i), (R): (ii), (S): (iv)
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6. In a Chord structured DHT (Distributed Hash Table) with N nodes, how many hops would a lookup operation require?
- N
- N/2
- log(N)
- log(logN)
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7. ______________function merges all intermediate values associated with the same intermediate key.
- Map
- Reduce
- Both Map and Reduce
- None of the mentioned
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8. _______________function processes a key/value pair to generate a set of intermediate key/value pairs.
- Map
- Reduce
- Both Map and Reduce
- None of the mentioned
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9. What is the primary purpose of the Map phase in MapReduce?
- To aggregate data
- To filter and sort data
- To process and transform input data into key-value pairs
- To store the final output
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10. In MapReduce, what happens in the Reduce phase?
- The input data is split into chunks
- Intermediate key-value pairs are processed and aggregated
- Data is sorted before processing
- New key-value pairs are created
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