Cloud Computing Week 3 NPTEL Assignment Answers 2025

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NPTEL Cloud Computing Week 3 Assignment Answers 2025

1. What does a cloud SLA typically NOT include?

A. Availability guarantee
B. Encryption algorithm details
C. Performance metrics
D. Penalty clauses

Answer : See Answers 

2. A multilevel SLA includes which of the following?

A. Only service-specific agreements
B. Multiple SLAs signed by different providers
C. Corporate, customer, and service levels
D. Only client-specific requirements

Answer :

3. Which of the following is a typical metric included in a cloud SLA?

A. Customer’s project schedule
B. Developer salary
C. Uptime percentage
D. IP address of the cloud provider

Answer :

4. Which of the following statements is TRUE regarding Cloud and Web Service SLAs?

A. Cloud SLAs cannot apply to Saas applications
B. Web Service SLAs are only applicable to internal systems
C. Web Service SLAs are narrower in scope than Cloud SLAs
D. Cloud SLAs are always written by customers, not providers

Answer :

5. A cloud service is guaranteed to handle 10,000 requests/hour with 99.5% success. How many failed
requests per hour are acceptable under SLA?

A. 5
B. 10
C. 50
D. 500

Answer :

6. Which characteristic is most unique to parallel databases and not shared with traditional relational
latabases in cloud environments?

A. Support for SQL
B. Multi-node distributed query execution
C. Transaction rollback
D. Normalized schema usage

Answer : See Answers

7. You are designing a big data pipeline that processes video files using a cloud-native distributed file
system. Which of the following choices is most suitable for scalable storage and parallel processing?

A. Amazon Aurora
B. Google Cloud Storage (with Hadoop connector)
C. AWS Lambda
D. Azure SQL Database

Answer :

8. Which of the following is not supported in MapReduce-based systems for iterative algorithms like
machine learning or graph processing?

A. Data must be reloaded from disk in each iteration
B. Mappers and reducers cannot share memory between iterations
C. It supports pipelined execution between stages
D. High overhead due to repeated job initialization

Answer :

9. A MapReduce job is processing 1 TB of input data. The “map” output is 500 GB, and the final “reduce” output is 50 GB. If the shuffle and sort phase fails due to insufficient disk I/O, which phase is affected and why?

A. Map phase, because it processes raw data
B. Reduce phase, because it merges map outputs
C. Input split phase, because files are not split
D. Combiner phase, because data isn’t reduced locally

Answer :

10. In an OpenStack deployment, if a compute node can support up to 100 virtual CPUs (vCPUs), and
the overcommit ratio for CPU is set to 1.5:1, what is the total number of vCPUs that can be allocated?

A. 100
B. 150
C. 66
D. 200

Answer : See Answers

NPTEL Cloud Computing Week 3 Assignment Answers 2024

1. Which of the following system/architecture follow(s) Quorum protocol for a large number of concurrent reads & writes?

Options:
a. Google File System (GFS)
b. BigTable
c. Dynamo
d. None of the above

Answer :- c ✅
Explanation: Amazon Dynamo uses the Quorum-based replication protocol to maintain availability and durability in distributed systems. It handles a large number of concurrent read/write operations effectively.

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2. Statement 1: In ephemeral storage, the stored objects persist until the VM is terminated.

Statement 2: The ephemeral storage is managed by Cinder in OpenStack.**

Options:
a. Statement 1 is TRUE, Statement 2 is FALSE
b. Statement 2 is TRUE, Statement 1 is FALSE
c. Both statements are TRUE
d. Both statements are FALSE

Answer :- a ✅
Explanation:

• Statement 1 is TRUE: Ephemeral storage exists only as long as the VM is running.
• Statement 2 is FALSE: Cinder manages block storage, not ephemeral storage. Ephemeral storage is managed by Nova.

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3. Column-oriented storage is efficient for data-warehouse workloads.

Options:
a. TRUE
b. FALSE

Answer :- a
Explanation: Column-oriented databases allow faster analytical queries on large data sets, which is ideal for data warehouses where reading specific columns is more frequent than writing rows.

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4. Horizon is a _____________ self-service portal to interact with underlying OpenStack services.

Options:
a. mobile based
b. OS based
c. web based
d. None of the above

Answer :- c
Explanation: Horizon is the web-based dashboard provided by OpenStack, allowing users to manage instances, storage, and networking resources via GUI.

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5. What is the parallel efficiency (Eff) of an algorithm, when a task takes time T in uniprocessor system, P is number of processors, M is time taken by each processor?

Options:
a. Eff = (TP)/M
b. Eff = T(M/P)
c. Eff = TPM
d. Eff = T/(P*M)

Answer :- d
Explanation:
Parallel Efficiency Eff=Sequential Time (T)P × Time per processor (M)=TP⋅M\text{Eff} = \frac{\text{Sequential Time (T)}}{\text{P × Time per processor (M)}} = \frac{T}{P \cdot M}Eff=P × Time per processor (M)Sequential Time (T)​=P⋅MT​

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6. In cloud, service downtime is 30 minutes and availability of the service is 0.80. What is the service uptime?

Options:
a. 120 minutes
b. 60 minutes
c. 150 minutes
d. 135 minutes

Answer :- c
Explanation:
Availability = Uptime / (Uptime + Downtime)
Let uptime = x.
Then, 0.80 = x / (x + 30) → Solve gives x = 120
Total = 120 + 30 = 150 minutes

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7. Which of the following is/are NOT SLA requirement(s) of PaaS cloud delivery model?

Options:
a. Data Retention and Deletion
b. Privacy
c. Machine-Readable SLAs
d. Certification

Answer :- a, c
Explanation:
PaaS SLAs generally do not mandate things like Data Retention or Machine-Readable SLAs as critical requirements, though they are more relevant for IaaS or SaaS. Privacy and Certification are standard requirements.

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8. What does the ‘availability’ metric represent in the monitoring and auditing of SLAs?

Options:
a. The speed at which a service responds
b. How often the service is available
c. The ability for a resource to grow infinitely
d. The percentage of uptime for a service

Answer :- d
Explanation:
Availability refers to the percentage of time that a system is operational and accessible during a given period.

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9. What architecture is used in a parallel database for the efficient execution of SQL queries?

Options:
a. Shared memory architecture
b. Shared disk architecture
c. Shared nothing architecture
d. Shared cache architecture

Answer :- c
Explanation:
Shared-nothing architecture is preferred in parallel databases as each node operates independently, avoiding bottlenecks and improving scalability and fault tolerance.

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10. ______________ is used for networking services in OpenStack.

Options:
a. Keystone
b. Neutron
c. Cinder
d. Swift

Answer :- b
Explanation:
Neutron is the OpenStack service that handles networking, including IP address management, DHCP, routing, and firewalling.

• Keystone → Identity
• Cinder → Block storage
• Swift → Object storage