WIRELESS CONNECTIONS &E-COMMERCE

Presentation Credits• “Introduction to Computers” by Peter

Norton• “Using Information Technology” by V.

Rajaraman

10A-3

Wired Internet Connections from your home• Dial-up connections• Broadband connection

• ISDN• DSL• Cable Modems

10A-4

Wireless Internet Connection• Wireless WAN (WWAN)

• Wireless network over a large area• Uses radio signals to transfer data• Speeds range from 1 to 100 Mbps• Antennas required• Subject to atmospheric disturbances

10A-5

Wireless Internet Connection• Satellite services

Image courtesy: http://ctd.grc.nasa.gov

10A-6

Wireless Internet Connection• Satellite services

• Internet access in remote regions• Suitable for home and office use• Needs a VSAT at the client

• Very Small Aperture Terminal• Connects to the satellite

• Modem connects to the VSAT• Geostationary satellites move with a speed

equal to that to Earth’s rotation

10A-7

Wireless Internet Connection• Wireless LANs (WLAN)

• Network without wires• Connects to a broadband LAN connection• WAP are wired directly into the LAN• Nodes use wireless

10A-8

Wireless LAN

10A-9

Wireless Internet Connection• Wireless security

• Crucial to protect wireless transmissions• Encryption protects transmissions• Wireless Encryption Protocol is quite weak• Wi-Fi Protected Access is stronger• MAC address of trusted computers• War driving

E-COMMERCE

10B-11

Consumer E-Commerce• Online shopping

• Purchasing through a web site• Also called Business to Consumer (B2C)• List of products is nearly endless• Features

• Searchable catalog• Secure checkout• Customer support page

10B-12

Consumer E-Commerce• Online stores versus brick and mortar

• Brick and mortar implies a physical store• Brick and mortar properties

• Limited hours• Salespeople can offer assistance• Customers can handle the merchandise

• Online store properties• Store is open 24 x 7• Salespeople usually not available• Can only view the merchandise

10B-13

Online vs. Brick and Mortar

Online store catalogOnline store catalog Brick and mortar store experienceBrick and mortar store experience

10B-14

Consumer E-Commerce• Using online catalogs

• Good online stores have a catalog• Products are often arranged by category• Products can be found by keyword• Amazon.com• Buy.com

10B-15

Consumer E-Commerce• Paying for purchases

• Vendors accept several payment methods• Credit cards• Paypal• Electronic Fund Transfer

• May need to create an account• Simplifies shipping• Encourages repeat shopping

Image courtesy: “Introduction to Information Technology” V. Rajaraman

10B-17

Consumer E-Commerce• Getting customer service

• Needed to resolve problems• Understand the policies before ordering• Contact information

• How you contact the vendor

• Return policies• Availability and fee for returning items

• Shipping policies• Charges and fees

• Convenience fees

10B-18

Consumer E-Commerce• Online banking

• Most teller services handled online• Balances can be obtained• Bills can be paid• Access is typically very secure• Not available at all banks

10B-19

Business E-Commerce• Business to business (B2B)

• Business transaction between companies• Accounts for the majority of e-commerce• Initially private networks were used• Common transactions

• Reorder inventory• Purchase stocks• Credit checks

10B-20

Business E-Commerce• Intranets and extranets

• Business partners must work together• Networks must work together

• Intranet uses Internet technologies• Only internal workers can access resources• Use a standard browser to access resources

• Extranets open the Intranet to clients• Clients have password level access• Allows the same abilities as employees

• Very simple to use and setup

10B-21

Business E-Commerce• Telecommuters

• Employee working outside of the office• Connects to the office through technology• Several technologies are used

• Home computer and the Internet• Key card changes passwords often• Encryption is used to protect data

10B-22

Security• Improved security measures

• Before 1998, Web security was nonexistent• Now safer than restaurant purchases• All reputable sites protect their customers

10B-23

Security• Secure web pages

• Allows safe transmission of credit card • Use the secure socket layer (SSL)

• Encrypts data transmission to the server

• Secure pages are easily identified• URL uses https://• Browser status bar shows a closed lock

10B-24

Secure pages

END OF LECTURE