Data Communication and the Cloud by David Kroenke

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Oct 24, 2013 (3 years and 1 month ago)

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Data Communication and
the Cloud

by David Kroenke

Using MIS 5e

Chapter 6

Chapter 6
-
2

GearUp:
“No, I
Mean
25
Cents
an
Hour
.”


Gearup’s Web hosting costs rising rapidly


Lucas suggests provisioning Web servers
and databases in the cloud


Provision server resources by the hour


Costs: $50/mo plus 25
-
cents per hour for
processing time used


Could yield huge savings

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Chapter 6
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3

Study Questions

Q1:
What is a computer network?

Q2: What
are the components of a LAN
?

Q3: What
are the fundamental concepts you
should know
about the Internet
?

Q4: What
processing occurs on a typical Web
server
?

Q5:
Why is the cloud the future for most
organizations?

Q6:
How can organizations use the cloud?

Q7: 2022?

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Chapter 6
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4

Q1: What Is a Computer Network?

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Chapter 6
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Q2: What Are the Components of a
LAN?

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SOHO
LAN

Chapter 6
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6

LAN Protocol

IEEE 802.3


Wired
LAN


10/100/1000
Mbps



Ethernet

IEEEE 802.11


Wireless LAN


802.11n


Bluetooth


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Chapter 6
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7

Summary of LAN and WAN Networks

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Chapter 6
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Connecting to an ISP

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Chapter 6
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9

Using MIS InClass 6: A Group Exercise

Opening Pandora’s Box


Sonos: leverages
technology to provide
entertainment


H
igh
-
quality,
wireless
LAN audio systems


U
ses
wired
Ethernet
to link up to 32 other
Sonos
devices around
home


Each
device
can
play
own
music or
same
audio
program


I
ncludes
a small computer
running Linux and
a proprietary
Sonos

protocol



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Chapter 6
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10

Q3: What Are the Fundamental Concepts
You Should Know About the Internet?

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Chapter 6
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11

TCP/IP Protocol Architecture

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Chapter 6
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Application Layer Protocols

Hyper Text Transport Protocol (http)

HTTPS
-

secure HTTP data transmission

Simple Mail Transfer Protocol (SMTP )

File Transfer Protocol (ftp)


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Chapter 6
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TCP and IP Protocols

TCP or Transmission Control Protocol


Breaks traffic up into packets and sends
each one along its way

IP (Internet Protocol)


Routers


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Chapter 6
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IP Addressing

Public IP Addresses


Identify a particular device on public Internet


Public IP addresses must be unique, worldwide


Assignment controlled by ICANN (Internet Corporation
for Assigned Names and Numbers)

Private IP Addresses


Identify a particular device on a private network

Major benefits

1.
Public IP: All devices on LAN share a public IP address.

2.
Private IP address, need not register computer with
ICANN
-
approved agencies.

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Chapter 6
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Functions of the LAN Device


Switch
processing:
IEEE 802.3 wired LAN traffic


Access
-
point processing:
IEEE 802.11 wireless
LAN traffic


Translating
between IEEE 802.3 and IEEE
802.11


Converting
between Analog and Digital


Assigning
private IP
addresses


Converting IP address
between private and
public
IP
addresses


R
outing packets


And more …

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Chapter 6
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Public IP Addresses and Domain Names

IPv4


Four decimal dotted notation like
165.193.123.253

Domain name


Worldwide
-
unique name affiliated
with a
public IP
address


A
ffiliation
of domain
names with
IP
addresses is
dynamic

URL (Uniform Resource Locator)

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Chapter 6
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17

Remote Access Using VPN

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Chapter 6
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WAN Using
VPN

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Chapter 6
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Q4: What Processing Occurs on a
Typical Web Server?

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Chapter 6
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Watch the Three Tiers in Action!

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Chapter 6
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Hypertext Markup Language (HTML)

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Chapter 6
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XML, Flash, Silverlight, HTML 5

XML (eXtensible Markup Language)


Fixes several HTML deficiencies


Program
-
to
-
program interaction over Web

Flash


Browser add
-
on for animation, movies, and
other advanced graphics inside a browser.

Silverlight


Browser add
-
on with greater functionality than
Flash

HTML 5.0


Supports animation, movies, and graphics

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Chapter 6
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Ethics Guide: Personal Work at Work


You email 12 pictures of your surfing skills from New
Zealand to a friend at some company in Ohio.


Each picture is 6.2 megabytes in size.


Packets of email and picture transmitted to Ohio
company router and from router to its email server.


Your message consumed processing cycles on router
and email server. A copy of your pictures stored on email
server until your friend deletes them.


Friend uses
company LAN to download the pictures to his
desktop computer.


Friend reads his email during his working hours.

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Chapter 6
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Q5. Why Is the Cloud the Future for
Most Organizations?

Cloud


Elastic
leasing of pooled computer
resources over
the
Internet

Elastic


Dynamically increasing/decreasing a
leased resource programmatically

in a
short span of time,
and only pay for
resource
used

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Chapter 6
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Why Is the Cloud Preferred to In
-
House
Hosting?

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Cloud

On Site

Positives:

Small capital requirements

Control of data location

Speedy development

In
-
depth visibility

of security and
disaster preparedness

Superior flexibility
and

adaptability to
growing

or
fluctuating

demand


Known cost

structure


Possibly best of breed security /
disaster

preparedness

No obsolesce


Industry
-
wide

economies of scale
hence cheaper

Chapter 6
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26

Why Is the Cloud Preferred to In
-
House
Hosting
? (cont’d)

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Negatives:

Dependency on vendor

Significant

capital required

Loss of control

over data location


Significant

development effort

Little visibility into true security and
disaster preparedness capabilities

Annual maintenance costs

Ongoing support costs

Staff and train personnel

Increased

management
requirements

Difficult (impossible?)

to
accommodate fluctuating demand

Cost uncertainties

Obsolesce

Chapter 6
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When Does the Cloud Not Make Sense?

Only when law or industry standard practices
require physical
control over
the data

P
rivate cloud


In
-
house
hosting, delivered via
Web
service standards

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Chapter 6
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Q6. How Can Organizations Use the
Cloud?

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Chapter 6
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29

Q7: 2022?

Cloud computing benefit


I
ndividuals
on
iCloud


Small
groups using Office
365


Startups Using
PaaS


Huge organizations
using
IaaS

New categories of products
and services

Create new jobs?

Tele
-
action


Telediagnosis, telesurgery,
telelaw
enforcement



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Chapter 6
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30

Guide: Thinking Exponentially Is Not
Possible, But…

Humans
cannot
think
exponentially


N
o
one could

imagine the growth in
magnetic
storage and what we would do
with
it (1990s).

E
xponential
growth
in:


Number
of Internet
connections


Web pages


A
mount of data
accessible
on Internet

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Chapter 6
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Guide: Thinking Exponentially Is Not
Possible, But…(cont’d)


W
hat
can we do to better anticipate


People
want to do what
they’re already
doing, but more easily; they want
to solve
problems that they already have
.


Hedging
your bets


Position yourself
to
move
quickly
as
direction becomes clear


Error increases
exponentially
as time frame
increases



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Chapter 6
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32

Ethics Guide: Human Networks

Matter More


Social networks are crucial in
connecting


Build personal social networks for
success


S
ix
-
degree theory


Y
ou
are connected to everyone on the
planet by
no more than six
degrees of
separation


Successful professionals consistently
build
personal human
networks


P
eople
you
know the
least contribute the
most to your network


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Chapter 6
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33

Active Review

Q1:
What is a computer network?

Q2: What
are the components of a LAN
?

Q3: What
are the fundamental concepts you
should know
about the Internet
?

Q4: What
processing occurs on a typical Web
server
?

Q5:
Why is the cloud the future for most
organizations?

Q6:
How can organizations use the cloud?

Q7: 2022?

C o p y r i g h t © 2 0 1 3 P e a r s o n E d u c a t i o n, I n c. P u b l i s h i n g a s P r e n t i c e Ha l l

Chapter 6
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34

Case Study 6:
Turbulent Air in Those
Azure Clouds



Microsoft has to find a profitable way to put
a big part of its
business out
of
business


If Azure is successful, Office 365 will
replace
Windows Server and SQL
Server,
which is 24% of current revenue


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Chapter 6
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35

Azure
Standard
Rates

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