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 Platform as a Service (PaaS)
• From the developer’s point of view (i.e., cloud users)

• Cloud providers offer an internet-based platform to developers who want to create services
but do not want to build their own cloud.

 Infrastructure as a Service (IaaS)
• Cloud providers build datacentres

• Power, scale, hardware, networking, storage, distributed systems, etc.
▪ Datacentre as a service
• Cloud users rent storage, computation and maintenance from cloud providers (pay- as-
you-go-like utility)
 Data as a Service (DaaS)
Data ® Information ® Knowledge ® Intelligence

• Infrastructure for web-scale data mining and knowledge discovery
• Empower people with knowledge

• Empower applications and services with intelligence
Benefits of cloud computing: There are several benefits of cloud computing because of which it
has become essential and popular these days.
 Reduces capital and operational costs

• No longer required to make large upfront capital investment on datacentres
• Eliminates the need to plan ahead for provisioning

• Allows companies to start small and increase their resource investment as needed (pay-as-
you-go)
 Simplifies app deployment & management

• Common programming model across mobile, browser, client, server, cloud
• Access to strong ecosystem of widely deployed applications
• Integration with existing IT assets (Software + Services)

8.34 SETTING UP A COMPUTER NETWORK—AN EXAMPLE

The network functioning is based on Client-Server architecture which requires effective and
efficient network design. It defines how clients are connected to server machine(s) on a network.
The most important rule or methodology for network (LAN) design is the 80:20 rule.
The 80:20 Thumb Rule

This thumb rule states that in a well-organized and designed network, 80 percent of the traffic on a
given network segment is local (i.e., destined for a destination system in the same workgroup), and
not more than 20 per cent of the network traffic should move across a backbone. The backbone in
Computer Networks
a network which violates this 80:20 rule leads to network congestion and traffic jams.

Keeping the above significant rule in mind, let us take an example to understand how to go about
LAN design.

8.65