CS 901 #7718 | TIA Chapters 7 & 9 | Singh

1. Technology in Action Overview of Chapter 7 & 9
By Harbakshish Singh

2. Fundamentals of Networking
A computer
network has
two or more
computers
There are two
categories of
networks
(LANs and
WANs)
They are
connected via
software and
hardware
Any device
connected to
network is
called node

3. Advantages of Networks
Share an Internet
connection
Conserve
Resources
Centralized
Administration
Lower cost
licensing
Share printers
and other
peripheral
devices
Share files and
communicate
with computers
Avoid file
duplication and
corruption

4. Disadvantages of Networks
Viruses
Hacking
Network
failure
Expert
support
required
Cost
Slow service

5. Ways to classify Networks
PAN (A
personal area
network)
LAN (A local
area network)
MAN (A
metropolitan
area network)
HAN (A home
area network)
WAN (A wide
area network)

6. What are Layers
Physical
Layer
Application
Layer
Data Link
Layer
Presentation
Layer
Session Layer
Network
Layer
Transport
Layer

7. Types of Layers and their use

8. Function of Layers

9. TCP/IP Model Consists of four layers
Link/Network
Interface
Application
Internet
Transport

10. Example of TCP/IP

11. Types Home Networks
Ethernet networks are the most
common networks used in home
networking.
Wired Ethernet home networks
use the gigabit Ethernet
standard.
Most Ethernet networks use a
combination of wired and
wireless connections, depending
on the data throughput required.
Wired connections usually
achieve higher throughput than
wireless connections.
Wireless Ethernet networks are
identified by a protocol
standard: 802.11 a/b/g/n.
• 802.11n is the most current standard.

12. Connection-oriented vs.
Connectionless Communication
• POP (Popular Post Office Protocol) used for sending
email messages require email client and server
verification
• VoIP (Voice over IP) used to make call without
verifying first whether another device is there.

13. Example of Connection between e-mail client and server

14. Example of Connectionless communication

15. Components of Network
• A means of connecting the nodes on the
net- work (cables or wireless
technology)
• Special hardware devices that allow the
nodes to communicate with each other
and to send data
• Software that allows the network to run

16. Ways to Connect to Internet
• Cable transmits data over coaxial cable that is also
used for cable television.
• DSL uses twisted-pair wire, similar to that used for
telephones.
• Fiber-optic cable uses glass or plastic strands to
transmit data via light signals.
• Satellite is a connection option for those who do not
have access to faster broadband technologies.
• WiFi allows users to connect to the Internet
wire-lessly but is not as fast as a wired connection.
• Mobile broadband is a 3G or 4G service delivered by
cell-phone networks.

17. Securing Wireless
Change your
network name
(SSID)
Implement media
access control
Limit your signal
range
Disable SSID
broadcast
Create a passphrase
Apply firmware
upgrade
Change the default
password on your
router
Turn on security
protocols

18. Some networking facts
A network with computers
acting as both clients and
servers is a peer-to-peer
network
Connection-oriented
communication requires the
client and server to
acknowledge the
transmission
A router connects LANs and
directs packets to the
correct LAN
Ethernet is the standard
A hub repeats frames down
every attached network
cable

19. Cybercrime and Identity Theft
By Harbakshish Singh

20. Cybercrime
The computer as a
target- attacking the
computers of others
The computer as
an accessory- using
computer as a
fancy filing cabinet
to store illegal or
stolen information
The computer as a
weapon- using a
computer to
commit crime

21. Examples of Cybercrime
•
•
•
•
•
Identity theft
Credit Card theft
Computer viruses
Illegal access of computer systems
Auction fraud

22. Example Cybercrime in current news
Six arrested in $45 million
global cybercrime scheme
The six arrested Monday were
"cashers" in the scheme,
withdrawing approximately
$2.8 million from more than
140 ATMs in New York City
Worldwide ATM heist that
stole $45 million from two
Middle East banks

23. Cybercrime news article

24. Types of Viruses
Boot
sector
viruses
Logic
bombs
and time
bombs
Worms
Scripts
and macro
viruses
E-mail
viruses
Encryption
viruses

25. What is social engineering, and how do I avoid
falling prey to phishing?
Social engineering schemes use human interaction, deception, and trickery to fool people
into revealing sensitive information such as credit card numbers and passwords.
Phishing schemes usually involve e-mails that direct the unwary to a website that appears to
be legitimate, such as a bank site, but that is specifically designed to capture personal
information for committing fraud. To avoid phishing scams, you should never reply directly to
any e-mail asking you for personal information and never click on a link in an e-mail to go to a
website.
Don't fall for scareware scams that attempt to frighten you by pretending there is something
wrong with your computer.

26. Protect Physical Computer Assets
Computing devices should be kept in clean environments
You should protect all electronic devices from power surges by hooking them up
through surge protectors
Mobile devices can be protected from theft by installing software that will (1) set
off an alarm if the computer is moved; (2) help recover the computer, if stolen, by
reporting the computer's whereabouts when it is connected to the Internet;
and/or (3) allow you to lock or wipe the contents of the digital device remotely.

27. The End
Presentation By Harbakshish Singh