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  1. LPU MCA Semester 1
  2. CAP470
  3. Unit 2

CAP470 · Unit 2: Cloud computing architecture

Deployment models: public, private, hybrid and community cloud

10 practice questions · in the MTE and ETE syllabus

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Key points

  • Four models: public, private, community, hybrid
  • Private cloud gives control, public gives scale and low cost
  • Hybrid links separate clouds through portable technology
  • Cloud bursting sends overflow to a public cloud

NIST defines four deployment models.

  • Public cloud: owned by a provider and available to the general public over the Internet (AWS, Azure, GCP). Lowest cost, highest elasticity, least control.
  • Private cloud: operated for a single organisation, on or off its premises. Most control over data, security and compliance, but higher cost and less elasticity.
  • Community cloud: shared by several organisations with common concerns such as regulations or mission, for example a group of universities or hospitals.
  • Hybrid cloud: a composition of two or more of the above that remain distinct entities but are bound by standard technology enabling data and application portability.

Cloud bursting is a hybrid technique where overflow demand from a private cloud is sent to a public cloud during peaks.

Example: a bank keeps customer records on a private cloud and hosts its marketing site on a public cloud.

Exam trap: hybrid does not merge the clouds; each part stays separate but connected.

Try two questions

Question 1 · Tier 3, Apply

A retailer keeps customer data on its private cloud but uses a public cloud for seasonal traffic. Which model is this?

  1. Pure public cloud
  2. Pure private cloud
  3. Hybrid cloud
  4. Community cloud
Show the answer

C. Combining a private cloud for sensitive data with a public cloud for peaks is the hybrid model.

Why not A: Customer data stays private, so it is not purely public.

Why not B: A public cloud is also used, so it is not purely private.

Why not D: No group of organisations with shared concerns is described.

Question 2 · Tier 2, Understand

Which model is shared by several organisations with common concerns, such as the same regulations?

  1. Public cloud for any customer
  2. Community cloud
  3. Private cloud for a single firm
  4. Personal cloud for a single user
Show the answer

B. A community cloud serves a specific group of organisations with shared requirements.

Why not A: A public cloud is not limited to a group with shared concerns.

Why not C: A private cloud serves a single organisation.

Why not D: A personal cloud is not a standard NIST deployment model.