The document provides an overview of cloud computing, starting from its historical context in the 1970s through the 2000s, and discusses key concepts such as virtualization, cloud models, and various services offered. It highlights the advantages of cloud computing like cost-effectiveness and scalability, while also addressing potential disadvantages including security risks and reliance on internet connectivity. Additionally, it categorizes cloud deployment models and services into public, private, hybrid, and community clouds, along with SaaS, PaaS, and IaaS offerings.

1. 1 History
1970s
1990s
2000s
2 Origin of term
3 Virtualization
4 Cloud models
5 Cloud services
6 Advantages
7 Disadvantages
8 Summarize
9 Questions
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History
Origin of term
There are different approaches to look at this:
1) The word "cloud" is commonly used in science to describe a large
agglomeration of objects that visually appear from a distance as a cloud
and describes any set of things whose details are not further inspected in a
given contex. This can be compared with our lessons Fundementals of programming
where taking abstraction is using the program/thing on a level where you don't
need to know how it actually works.
2) Another explanation is that the old programs that drew network schematics
surrounded the icons for servers with a circle, and a cluster of servers in a
network diagram had several overlapping circles, which resembled a cloud.
This can be compared to our lessons Networking, where we draw some
computers and servers which we surround into 1 looks like a cloud.
/Draw example/
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1970's
During the 1960s, the initial concepts of time-sharing became popularized via
RJE (Remote Job Entry) this terminology was mostly associated with large vendors
such as IBM and DEC. Full time-sharing solutions were available by the early
1970s
Remote Job Entry, is sending data to be processed to a computer.
Like a print queue.
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1990's
In the 1990s, telecommunications companies, who previously offered primarily
dedicated point-to-point data circuits, began offering virtual private network
(VPN) services with comparable quality of service, but at a lower cost.
VPN is being connected to one computer/server and connect another point from
there
thorought the use of VPN protocols.
/Draw example/
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2000's

2. Since 2000, cloud computing has come into existence.
This is were big players came in to provide the services.
It's in the early 2008 companies started to really use Cloud computing as we
know it today.
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Virtualization != The Cloud
virtualization is software that separates physical infrastructures to create
various dedicated resources.
It is the fundamental technology that powers cloud computing.
Essentially, virtualization differs from cloud computing because
virtualization is software that manipulates hardware, while cloud computing
refers to a service that results from that manipulation.
"Virtualization software makes it possible to run multiple operating systems
and multiple applications on the same server at the same time,
It enables businesses to reduce IT costs while increasing the efficiency,
utilization and flexibility of their existing computer hardware."
Difference public (use of software) vs private (use of software and your own OS
of choice)
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Deployment Models
Acces to the cload, i.e., how is the cloud located?
4 types of acces:
- Public
- Private
- Hybrid
- Community
Public Cloud: The Public Clouds allows systems and services to be easily
accessible to the general public. Public cload may be less secure because of
its openness, e.g. e-mail.
Private Cloud: The Private Cloud allows systems and services to be accessible
within an organization. It offers increased security because of it's private
nature.
Hybrid Cloud: The Hybrid Cloud is a mixture of public and private cloud.
However, the critical activities are performed using private cloud while
the non-critical activities are performed using public cloud.
Community Cloud: The Community Cloud allows systems and services to be
accessible by group of organizations.
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Services

3. Many different cloud computing models available - commons ones include;
- Software as a Service (SaaS)
Microsoft Office, CRM en ERP software, etc..
- Platform as a Service (PaaS)
Computing resources (Ram, CPUs, hard drive space),
and software, such as Microsoft Windows and Microsoft Office
- Infrastructure as a Service (IaaS)
Computing power (RAM, CPUs, hard drive space)
Often know as Utility Computing
Others: DaaS = Data as a Service
Collects user data by offering individuals the ability to benchmark their
compensation levels against others.
CaaS = Communication as a Service
is responsible for the management of hardware and software required for
delivering Voice over IP (Voice as a Service), instant messaging,..
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Advantages:
- An office-in-a-Box solution
- Provides acces to enterprise level resources without the capital expenditure
- Usually provides everything you need to perform daily business functions
including Windows, Microsoft Office, an Exchange mailbox, and full remote
support
- Perfect for smaller companies who don't employ IT staff and don't have the
funds to
invest in on-site hardware
- Transparent, per user monthly costs
- Pay what you need
- Instant updates
- Anywhere Anytime Any device
- Unlimited Data
Disadvantages:
- Requires a constant internet connection
- Does not work well with low speed connections
- Features might be limited
- Can be slow
- Stored data can be lost
- Stored data might not be secure
- Stored data private (SLA level of agreement)
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To summarise...
Features and their benefits to you:
- Flexibility
- Scalability
- Resilience
- Security
- Lower Costs
- Backed up
- Availability

4. ***************************************************************************
Any questions?
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