What is Cloud Computing?
Cloud Computing can
be defined as delivering computing power CPU Ram network speeds is strong or
software as a service over a network usually on the Internet rather than
physically having the computing resource at the customer location.
Example: AWS, Azure, Google Cloud,
Let's learn Cloud computing with an example -
Whenever you travel on a bus or train, you take a
ticket for your destination and hold back to your seat till you reach your
destination. Likewise, other passengers also take ticket and travel in the same
bus with you and it hardly bothers you where they go. When your stop comes you
get off the bus thanking the driver. Cloud computing is just like that bus,
carrying data and information for different users and allows to use its service
with minimal cost.
Cloud Computing Services
The three major Cloud Computing Offerings are
- · Software as a Service (SaaS)
- · Platform as a Service (PaaS)
- · Infrastructure as a Service (laaS)
Different business use some or all of these components
according to their requirement.
SaaS (Software as a Service)
SaaS or software as a service is a software distribution
model in which applications are hosted by a vendor or service provider and made
available to customers over a network (internet)) SaaS is becoming an increasingly
prevalent delivery model as underlying technologies that supports Service
Oriented Architecture (SOA) or Web Services. Through the internet, this service
is available to users anywhere in the world.
Traditional, software applications needed to be purchased
upfront &then installed it onto your computer. SaaS users on the other
hand, instead of purchasing the software subscribe to it, usually on monthly basis via the internet.
Anyone who needs access to a particular piece of software
can be subscribe as a user, whether it is one or two people or every thousand
of employees in a corporation. SaaS is compatible with all internet-enabled
devices.
Many important tasks like accounting, sales, invoicing and
planning all can be performed using SaaS.
PaaS (Platform as a Service)
Platform as a service is referred as PaaS, it provides a
platform and environment allow developers to build applications and services.
This service is hosted in the cloud and accessed by the users via the internet.
To understand in simple terms, let's compare this with
painting a picture, where I are provided with paint colors, different paint
brushes and paper by you school teacher and you just have to draw a beautiful
picture using those tools.
PaaS services are constantly updated & new features are added.
Software developers, web developers and businesses can benefit from PaaS. It
provides a platform to support application development. It includes software
support and management services, storage, networking, deploying, testing,
collaborating, hosting and maintaining applications.
IaaS (Infrastructure as a Service)
laaS (Infrastructure As A Service) is one of the fundamental
service model of cloud computing alongside PaaS( Platform as a Service). It
provides access to computing resources in a virtualized environment "the
cloud on internet. It provides computing infrastructure like virtual server
space, network connections, bandwidth, load balancers and IP addresses. The
pool of hardware resource is extracted from multiple servers and networks
usually distributed across numerous data centers. This provides redundancy and
reliability to laaS.
DIGITAL SIGNATURE:
A digital signature is a mathematical technique used to
validate the authenticity and integrity of a message, software or digital
document. As the digital equivalent h of a handwritten signature or stamped
seal, a digital signature offers far more interent security, and it is intended
to solve the problem of tampering and impersonation in digital communications.
Digital signatures can provide the added assurances of
evidence of origin, identity and status of an electronic document, transaction
or message and can acknowledge informed consent by the signer.
In many countries, including the United States, digital
signatures are considered legally binding in the same way as traditional
document signatures.
How digital signatures work
Digital signatures are based on public-key cryptography, also
known as asymmetric cryptography. Using a public key algorithm, such as RSA,
one can generate two keys that are mathematically linked: one private and one
public.
Digital signatures work through public-key cryptography's
two mutually- authenticating cryptographic keys. The individual who is creating
the digital Signature uses their own private key to encrypt signature-related
data, the only way to decrypt that data is with the signer's public key. This
is how digital signatures are authenticated.
Digital signature technology requires all the parties to
trust that the individual creating the signature has been able to keep their
own private key secret. If Someone else has access to the signer's private key,
that party could create fraudulent digital signatures in the name of the
private key holder.
VOICE OVER INTERNET PROTOCOL (VOIP):
Voice over Internet Protocol (VolP), also called IP
telephony, is a method and group of technologies for the delivery of voice communications
and multimedia sessions over Internet Protocol (IP) networks, such as the
Internet. The terms Internet telephony, broadband telephony, and broadband
phone service specifically refer to the provisioning communications services
(voice, fax, SMS, voice-messaging) over the public Internet, rather than via
the public switched telephone network (PSTN), also known as plain old telephone
service (POTS).
VoIP advantages & disadvantages
When considering a move to a VoIP telephone system, it is
always worse to look at both sides of the case for the move. Whilst VOIP makes
a lot of sense for a business telephone system, it can also have advantages for
small enterprises and even domestic applications.
However, there is never one ideal solution and the
disadvantages must be considered along with the advantages.
VolP advantages:
One network system: For businesses, one of the main advantages is the cost-saving from only needing to install one network system for computers/data. The business telephone system runs over the computer network, thereby only requiring one system to be installed and maintained.
Can run on existing computers: Although many people and
companies will want to maintain the use of a traditional telephone handset, it
is also possible to completely move on from this approach and just use the
computers that most people in-office use. A phone application can be run on
the computer and this can be used with a headset or earphones with an attached
microphone. Again this can provide cost savings in terms of hardware and
maintenance.
Mobility: With a VolP telephone system it is far easier for
people's numbers to follow them. As everything is run using software it is easy
for the phones to 'move.' If the phone is run on a computer, simply logging in
to one's account can allow the system to route calls correctly. This is ideal
for offices where hot-desking is used, or where people move around the country
or even further.
Improved efficiency: Using a packet-switched network as in the case of VolP increases the usage for the available capacity when compared to
analog circuit-switched lines. This improvement in efficiency reduces
overpaying costs and enables the telecommunications provider to offer a far more
cost-effective service.
Cost: Cost. can be a strong driver for many users. Providers
can often give running costs that are well below those of traditional analog
systems, although this is sometimes as a result of the older systems having
older pricing structures. However once installed there can be significant
overall cost reductions, but check the offers and deals available and check
both hardware and connection/call costs.
VolP disadvantages:
Lack of understanding of VolP telephony: Many users and
indeed many suppliers do not have a full understanding of VolP telephone
systems. This can mean that they are not always installed where they can
provide the best service, or when they are installed, they may not be deployed
in the most effective way.
Emergency calls: In some areas and with some providers,
emergency, 911, calls can be an issue. With traditional telephone systems, and
with mobiles 911 (or whatever the emergency number is for the region) calls
connect directly to the emergency services. This is not always the case with
some VolP providers. It is a point worth checking before proceeding if this
could be an issue.
Voice quality on poor connections: When using a VolP
telephone system over a poor broadband connection, be it via a smartphone,
using a poor broadband line, or whatever, voice quality can be impaired. If
data packets are lost as a result of them being timed out as a result of the
poor connection, this will impact voice quality. This can be particularly
apparent when using Wi-Fi or cellular connections where the network is
congested as a result of high usage or the signal is poor and the data rate is
very low.
Different facilities: Although VoIP has been available for
some time and is able to offer a lot more capability than analog phones,
there may still be some facilities that are different or not available.
Normally any issues can be overcome, but there may be some issues with any
migration.
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