Cloud Computing and Distributed Systems Week 7 Answers

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Cloud Computing and Distributed Systems Week 7 Answers (Jan-Apr 2025)

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1) Which of these P2P systems uses a 1-hop Lookup DHT (Distributed Hash Table)?

a. CAN
b. CHORD
c. Kelips
d. 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.

a. Physical-level
b. Network-level
c. Transport-level
d. Application-level

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3) What is the characteristic of a P2P network?

a. Fault Tolerance
b. Self-Adaptation
c. Dealing with instability
d. 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.

a. X: O(M + R), Y: O(M * R)
b. X: O(M * R), Y: O(M * R)
c. X: O(M + R), Y: O(M + R)
d. 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:

a. (P): (i), (Q): (ii), (R): (iii), (S): (iv)
b. (P): (iii), (Q): (iv), (R): (i), (S): (ii)
c. (P): (iv), (Q): (iii), (R): (i), (S): (ii)
d. (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?

a. N
b. N/2
c. log(N)
d. log(logN)

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7) ______________ function merges all intermediate values associated with the same intermediate key.

a. Map
b. Reduce
c. Both Map and Reduce
d. None of the mentioned

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8) _______________ function processes a key/value pair to generate a set of intermediate key/value pairs.

a. Map
b. Reduce
c. Both Map and Reduce
d. None of the mentioned

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9) What is the primary purpose of the Map phase in MapReduce?

a. To aggregate data
b. To filter and sort data
c. To process and transform input data into key-value pairs
d. To store the final output

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10) In MapReduce, what happens in the Reduce phase?

a. The input data is split into chunks
b. Intermediate key-value pairs are processed and aggregated
c. Data is sorted before processing
d. New key-value pairs are created

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Cloud Computing and Distributed Systems Week 7 Answers (Jan-Apr 2025)

For answers to others Nptel courses, please refer to this link: NPTEL Assignment