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year2/semester1/logseq-stuff/pages/Cloud Computing.md

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+- #[[CT216 - Software Engineering I]]
+- No previous topic
+- **Next Topic:** [[Software Processes]]
+- **Relevant Slides:** ![Lecture01.pdf](../assets/Lecture01_1662846749778_0.pdf)
+-
+- What is **Cloud Computing**? #card
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+	- **Cloud Computing** is a model for enabling convenient, on-demand network access to a ^^shared pool of configurable computing resources^^ (e.g., networks, servers, storage, applications, & services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.
+- What is a **Public Cloud**? #card
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+	- Amazon, MS Azure, & Google Cloud are examples of **public clouds**.
+	- Any member of the public can sign up and start provisioning computing resources within minutes.
+	- They are **highly scalable** and allow an organisation to grow its infrastructure rapidly.
+- What is a **Private Cloud**? #card
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+	- Computing resources are dedicated to a single customer and not shared with other customers.
+	- Considered to be more **secure**.
+- What is a **Hybrid Cloud**? #card
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+	- A **hybrid cloud** is simply a mix of public & private cloud resources.
+	- An organisation may choose this option if there is a mixture in the criticality of their data or computational requirements.
+	- Data that doesn't require heightened security can be pushed onto the **public cloud**, while data which does can be hosted on the **private cloud**.
+- ## Cloud Services
+	- What is **SaaS**? #card
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+		- **Software as a Service (SaaS)** provides users with (essentially) ^^a **cloud application**, the platform on which it runs, & the platform's underlying infrastructure.^^
+	- What is **PaaS**? #card
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+		- **Platform as a Service (PaaS)** provides users with ^^compute, networking, & storage resources.^^
+-
+- What are the advantages of cloud computing? #card
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+	- **Elasticity** - if your application becomes very popular, you can procure new resources within minutes.
+	- Reduced capital expenditure.
+	- Economies of scale.
+- What are the disadvantages of cloud computing? #card
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+	- Security / privacy
+	- Cost
+	- Migration issues