Transcript Using MIS 5e Chapter 6

Chapter 6
Data Communication and
the Cloud
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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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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Q4: What Processing Occurs on a
Typical Web Server?
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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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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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