Using MIS 5e Chapter 6

Report
Chapter 6
Data Communication and
the Cloud
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¢ per hour for
processing time used
• Could yield huge savings
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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: 2023?
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Q1: What Is a Computer Network?
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Q2: What Are the Components of a
LAN?
SOHO
LAN
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LAN Protocol
•IEEE 802.3
– Wired LAN
•IEEE 802.11
– Wireless LAN
– 10/100/1000 Mbps – 802.11n
– Up to 600 Mbps
– Ethernet
– Bluetooth
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Summary of LAN and WAN Networks
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Connecting to an ISP
Important ISP functions:
1.Provide a legitimate Internet address
2.Gateway to the Internet
3.Pay for the Internet by collecting money
from customers and paying access fees
and other charges to telecom
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Using MIS InClass 6: A Group Exercise
Opening Pandora’s Box
• Sonos: leverages technology to provide
entertainment
• High-quality, wireless LAN audio systems
• Uses wired Ethernet to link up to 32 other Sonos
devices around home
• Each device can play own music or same audio
program
• Includes a small computer running Linux and a
proprietary Sonos protocol
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Q3: What Are the Fundamental Concepts
You Should Know About the Internet?
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TCP/IP Protocol Architecture
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Application Layer Protocols
•
•
•
•
Hypertext Transport Protocol (HTTP)
HTTPS – Secure HTTP data transmission
Simple Mail Transfer Protocol (SMTP )
File Transfer Protocol (FTP)
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TCP and IP Protocols
• Transmission Control Protocol (TCP)
– Breaks traffic up into packets and sends
each one along its way
• IP (Internet Protocol)
• Routers
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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
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IP Addressing (cont'd)
Major benefits
• Public IP: All devices on LAN share a
public IP address
• Private IP: Need not register computer with
ICANN-approved agencies
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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
• Routing packets, and more …
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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
– Affiliation of domain names with IP
addresses is dynamic
•URL (Uniform Resource Locator)
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Domain Registrar Company
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Remote Access Using VPN
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WAN Using VPN
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Ethics Guide: Is It Spying or Just Good
Management?
• 92% of employers
monitor employees’
email, telephone
and Internet use.
(2003)
• Techniques used
– Key loggers
– Log files
– Packet sniffers
– Video surveillance
cameras
– Audio recorders
– Office spies
– Text mining
• Employees at will
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Q4: What Processing Occurs on a
Typical Web Server?
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Sample of Commerce Server Pages;
Product Offer Pages
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Watch the Three Tiers in Action!
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Hypertext Markup Language (HTML)
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Q5: Why Is the Cloud the Future for
Most Organizations?
• What is the Cloud?
– Elastic leasing of pooled computer
resources over the Internet
• Elastic
– Dynamically increasing/decreasing of
leased resources in short time span, and
only pay for resources used
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Apple Data Center in Maiden, NC
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Why Is the Cloud Preferred to In-House
Hosting?
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Why Is the Cloud Preferred to In-House
Hosting? (cont’d)
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Why Now?
• Technology now supports construction and
use of enormous data centers
• Processors, data communication, and data
storage are so cheap as to be nearly free.
• Huge Web farms providing a virtual
machine for essentially nothing (1.5¢ per
hour).
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When Does the Cloud Not Make Sense?
• Law or industry standard practices require
physical control over the data
• Private cloud
– In-house hosting, delivered via Web
service standards
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Q6: How Can Organizations Use the
Cloud?
Three Fundamental Cloud Types
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Q7: 2023?
• Cloud computing benefit
– Individuals 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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Ethics Guide: You Said What? About
Me??? In Class???
• Packet analyzer. a.k.a. packet sniffer
• Read, record, and display all wireless
packets around them
• www.wireshark.com
• Pickup instant messages, most email, and
any http:// Web traffic
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What Can You Do?
• Use https://
• Packet sniffer will know where you went,
but won’t obtain data about what you did
there.
• Do not use your computer or mobile device
for any unauthorized purpose in class.
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Guide: Thinking Exponentially Is Not
Possible, But…
Humans think linearly, not exponentially
• No one in 1990s could imagine growth in
magnetic storage and what we would do
with it.
Exponential growth in:
• Number of Internet connections
• Web pages
• Amount of data accessible on Internet
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Linear vs. Exponential Growth
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Guide: Thinking Exponentially Is Not
Possible, But…(cont’d)
• What can we do to better anticipate?
• People want to do what they’re already
doing.
• Hedging your bets
– Position yourself to move quickly as
direction becomes clear.
• Risk: Error increases exponentially as time
frame increases.
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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: 2023?
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Case Study 6: Turbulent Air in Those
Azure Clouds
• Microsoft must find a profitable way to put a
big part of its business out of business
• If Azure successful, Office 365 will replace
Windows Server and SQL Server, which is
24% of current revenue
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Azure
Standard
Rates
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