Cloud Computing Week 3 NPTEL Assignment Answers 2025

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.

---

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.

---

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.

---

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.

---

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​

---

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

---

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.

---

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.

---

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.

---

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