Cloud Computing Week 5 Assignment Answer
Cloud Computing Week 5 Assignment Answer
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1. A cloud provider guarantees 99% availability. An application is scheduled to run Y hours per day
for 20 days. The observed downtime is 4 hours, and the SLA is violated.
What is the maximum possible value of Y?
A. Y < 20
B. Y ≥ 20.2
C. Y = 24
D. Insufficient data
Answer : a
2. Which statement is always true in a multi-core cloud server?
A. Power consumption decreases as cores increase
B. Power consumption increases strictly linearly with cores
C. Activating more cores increases instantaneous power draw
D. Energy per task always increases with more cores
Answer : c
3. An enterprise transitioning from pure on-premise infrastructure to a hybrid cloud model will
experience the most significant change in which economic aspect?
A. Operating expenditure increases relative to capital expenditure
B. Total cost of ownership (TCO) always decreases
C. Fixed costs does not decrease while variable costs increase
D. Annual revenue decreases due to infrastructure overhead
Answer : a
4. Which cloud characteristic most directly improves cost efficiency for unpredictable workloads?
A. High availability
B. Elastic scalability
C. Geographic redundancy
D. Dedicated hardware
Answer : b
5. Which technology allows multiple operating systems to run on the same physical server?
A. Containerization
B. Virtualization
C. Load balancing
D. RAID
Answer : b
6. Which factor MOST improves MapReduce performance in the cloud?
A. Increasing reducer count
B. Increasing replication factor
C. Scheduling mappers on nodes storing the data
D. Using larger block size only
Answer : c
7. Increasing HDFS block size generally results in:
A. More parallelism
B. Fewer mappers & reduced scheduling overhead
C. More shuffle traffic
D. Reduced fault tolerance
Answer : b
8. In a cloud data center, an organization must choose between containerization and full virtualization
for a high-density workload. Which statement best reflects the trade-off?
A. Containers provide stronger isolation than VMs because they use separate kernels
B. VMs have lower overhead because they share the host OS kernel
C. Containers achieve higher density but weaker isolation compared to VMs
D. Both have identical resource overhead
Answer : c
9. A cloud provider runs 8 physical servers hosting 32 VMs with an average CPU utilization of 50%.
After energy-aware consolidation, the VMs are migrated to 5 servers, increasing average CPU
utilization to 75%. Which consequence is most likely?
A. Total power consumption decreased; SLA violation risk increased
B. Total power consumption increased; SLA improved
C. Total power consumption decreased; SLA unaffected
D. Insufficient data to determine impact
Answer : a
10. Which resource management technique helps avoid hotspots in a cloud cluster?
A. Energy-aware scheduling
B. VM migration / load balancing
C. Increasing replication factor
D. Using larger HDFS blocks
Answer : b
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