Computer Science/IT MCQs
Topic Notes: Computer Science/IT
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
11
What is the main benefit of adopting a 'cloud-first' strategy?
Answer:
To prioritize cloud solutions for new IT initiatives and procurements.
A cloud-first strategy means that an organization considers cloud solutions as the primary approach for acquiring and deploying new IT infrastructure, applications, and services, leveraging the benefits of scalability, flexibility, and cost-efficiency.
12
Which service model provides customers with access to the underlying computing infrastructure, allowing them to deploy and run arbitrary software?
Answer:
Infrastructure as a Service (IaaS).
IaaS provides fundamental computing resources such as virtual machines, storage, networks, and operating systems, giving users the most control over their infrastructure.
13
Cloud computing typically transforms IT expenditure from what to what?
Answer:
CapEx to OpEx.
Cloud computing reduces the need for upfront investments in hardware and instead allows businesses to pay for resources as they use them, shifting from capital expenditures (CapEx) to operational expenditures (OpEx).
14
What is a 'hypervisor' in a cloud computing environment?
Answer:
Software that creates and runs virtual machines.
A hypervisor, also known as a virtual machine monitor (VMM), is computer software, firmware or hardware that creates and runs virtual machines. It allows one host computer to support multiple guest virtual machines by virtually sharing its resources.
15
Why is 'data egress' a significant cost factor in cloud computing?
Answer:
Because cloud providers charge for data transferred out of their network.
Cloud providers commonly charge for data egress (data transferred out of the cloud infrastructure to the internet or another region) but often provide data ingress (data transferred into the cloud) for free or at a much lower cost. This can become a significant operational cost.
16
The concept of 'elasticity' in cloud computing means:
Answer:
The ability to quickly expand or decrease computer processing, memory, and storage resources to meet changing demands.
Elasticity is the degree to which a system can adapt to workload changes by provisioning and de-provisioning resources in an autonomic manner, such that at each point in time the available resources match the current demand as closely as possible.
17
What is a key difference between a private cloud and a public cloud?
Answer:
Public clouds are shared by multiple organizations, while private clouds are dedicated to a single organization.
The fundamental difference lies in ownership and sharing. Public clouds leverage shared infrastructure by multiple tenants, while private clouds are dedicated to one organization, offering more exclusivity and often greater customization.
18
Which cloud service model offers the most control to the user?
Answer:
IaaS.
IaaS provides users with the most control over the computing resources, allowing them to manage operating systems, applications, and network configurations directly, unlike PaaS and SaaS which abstract away more layers.
19
What is the concept of 'vendor lock-in' regarding cloud computing?
Answer:
The difficulty of switching cloud providers due to reliance on proprietary technologies or services.
Vendor lock-in is a situation where a customer is dependent on a single vendor for products and services and cannot easily switch to another vendor without substantial costs, effort, or potential disruption. This is a common concern in cloud computing due to proprietary APIs, data formats, and service integrations.
20
What is the primary function of cloud 'monitoring and logging' services?
Answer:
To collect, store, and analyze data about the performance, health, and security of cloud resources and applications.
Monitoring and logging services are crucial for operational visibility. They collect metrics, logs, and traces from various cloud resources to help users understand system behavior, troubleshoot issues, optimize performance, and ensure security and compliance.