ICT Cloud Computing and Virtualization 3 — Questions and Answers
Question 1: What is 'cloud bursting'?
- A cloud outage caused by overload
- Automatically using public cloud resources when private cloud capacity is exceeded (Correct answer)
- Migrating all data to the cloud
- Splitting traffic across multiple CDNs
Correct answer: Automatically using public cloud resources when private cloud capacity is exceeded
Cloud bursting lets workloads overflow from a private cloud to a public cloud during peak demand.
Question 2: Which storage type in cloud environments provides block-level storage commonly used for databases?
- Object storage
- File storage
- Block storage (Correct answer)
- Cold archive storage
Correct answer: Block storage
Block storage presents raw volumes to VMs, making it ideal for databases that require low-latency I/O.
Question 3: What is the primary purpose of a Virtual Private Cloud (VPC)?
- To encrypt data at rest
- To provide an isolated network segment within a public cloud (Correct answer)
- To replicate VMs across regions
- To manage user identities and access
Correct answer: To provide an isolated network segment within a public cloud
A VPC creates a logically isolated network in the public cloud where you control IP ranges, subnets, and routing.
Question 4: In containerization, what does a container image contain?
- A full OS kernel and hardware drivers
- Application code, runtime, libraries, and configuration bundled together (Correct answer)
- Only the application binary
- A hypervisor and virtual hardware definitions
Correct answer: Application code, runtime, libraries, and configuration bundled together
A container image packages everything the application needs to run except the OS kernel, which is shared.
Question 5: Which cloud cost model charges based on actual usage with no upfront commitment?
- Reserved instances
- Spot pricing
- On-demand pricing (Correct answer)
- Dedicated hosts
Correct answer: On-demand pricing
On-demand pricing lets you pay by the hour or second for resources without long-term contracts.
Question 6: What is 'live migration' in virtualization?
- Copying a VM image to object storage
- Moving a running VM from one physical host to another without downtime (Correct answer)
- Upgrading a VM's OS while it runs
- Replicating a VM to a disaster recovery site
Correct answer: Moving a running VM from one physical host to another without downtime
Live migration (e.g., vMotion) transfers a running VM's memory and state to another host with no service interruption.
Question 7: Which cloud networking component acts as a virtual firewall controlling inbound and outbound traffic at the instance level?
- Network Access Control List (NACL)
- Security Group (Correct answer)
- Route Table
- Internet Gateway
Correct answer: Security Group
Security groups are stateful firewalls applied at the instance level, allowing you to specify allowed traffic rules.
