CS Cloud Computing & Services 3 — Questions and Answers
Question 1: An e-commerce site experiences traffic spikes during sales. Which cloud feature adds or removes VM instances automatically based on CPU utilization?
- Auto-scaling groups (Correct answer)
- Manual snapshotting
- Cold storage tiering
- Static load provisioning
Correct answer: Auto-scaling groups
Auto-scaling groups monitor metrics like CPU and adjust the number of instances automatically.
Question 2: Which term describes the risk of becoming dependent on one cloud provider's proprietary services, making migration difficult?
- Vendor lock-in (Correct answer)
- Data sovereignty
- Cloud bursting
- Fault tolerance
Correct answer: Vendor lock-in
Vendor lock-in occurs when proprietary APIs and services make switching providers costly and complex.
Question 3: A developer deploys an app to a service that handles the OS, runtime, and scaling, requiring only the application code. Which service model is this?
- Platform as a Service (PaaS) (Correct answer)
- Infrastructure as a Service (IaaS)
- Software as a Service (SaaS)
- Storage as a Service
Correct answer: Platform as a Service (PaaS)
PaaS provides a managed platform including OS and runtime so developers focus solely on code.
Question 4: What does 'multi-tenancy' mean in a public cloud environment?
- Multiple customers share the same physical infrastructure with logical isolation (Correct answer)
- Each customer receives dedicated physical servers
- One customer runs multiple applications on one VM
- Data is replicated across multiple regions
Correct answer: Multiple customers share the same physical infrastructure with logical isolation
Multi-tenancy lets many customers securely share pooled hardware through virtualization and logical isolation.
Question 5: Which cloud storage type is best suited for storing large amounts of unstructured data like images and backups, accessed via HTTP APIs?
- Object storage (Correct answer)
- Block storage
- File storage (NFS)
- In-memory cache
Correct answer: Object storage
Object storage like Amazon S3 stores unstructured data as objects with metadata, accessed via REST APIs.
Question 6: A company must ensure customer data remains within the country where it was collected due to legal requirements. This concern is called what?
- Data sovereignty (Correct answer)
- Data deduplication
- Data elasticity
- Data federation
Correct answer: Data sovereignty
Data sovereignty refers to data being subject to the laws of the country where it is physically stored.
Question 7: Which metric in a cloud SLA expresses the guaranteed percentage of time a service will be operational?
- Availability (uptime) (Correct answer)
- Throughput
- Elasticity ratio
- Provisioning speed
Correct answer: Availability (uptime)
SLAs typically guarantee availability, such as 99.99% uptime, with penalties if the provider falls short.
CS Cloud Computing & Services 3
An e-commerce site experiences traffic spikes during sales.
Which cloud feature adds or removes VM instances automatically based on CPU utilization?