Getting Online, Working Online

1
lesson 20
Getting Online, Working Online
2

• This lesson includes the following sections
• Accessing the Internet
• Connecting a PC to the Internet
• Working on the Internet
• Commerce on the World Wide Web

3
Accessing the Internet

• Non-Standard Methods
• Common Connection Methods
• High-Speed Data Links

4
Accessing the Internet - Non-Standard Methods
These methods of connecting to the Internet are
not commonly used

• Direct connection connects an isolated PC
  directly to the Internet backbone via serial line
  interface protocol (SLIP) or point-to-point
  protocol (PPP).
• Remote terminal connection allows the user to
  exchange commands and data in ASCII text format
  with a UNIX host computer.
• Gateway connection connects a non-TCP/IP
  network to the Internet via a gateway.

5
Accessing the Internet - Common Connection
Methods
Here are some very common methods for connecting
PCs to the Internet

• Connection through a LAN if a LAN uses TCP/IP,
  it can exchange data over the Internet without a
  gateway. If the LAN is connected to the Internet
  via a router, the connection is extended to all
  nodes on the network.
• Connection through a modem if a stand-alone PC
  has access to a modem and phone line, it can
  connect directly or via an Internet Service
  Provider (ISP). ISP accounts are the most common
  type of connection.

6
(No Transcript)
7
Accessing the Internet - High-Speed Data Links
Because modem speeds are limited to 56 Kbps, many
home users and small businesses connect to the
Internet via high-speed lines, such as

• ISDN service can transmit data up to 128 Kbps and
  carries voice and data signals over a single
  connection.
• xDSL services are available in several forms with
  download speeds up to 52 Mbps, and also offer
  simultaneous voice and data transmissions.
• Cable modem service offers high-speed data
  transmission over a cable television system's
  existing coaxial lines.

8
(No Transcript)
9
Connecting a PC to the Internet

• To connect a PC to the Internet, you use
  applications and network connections that conform
  to the Winsock standard.
• The Winsock standard ensures that connections and
  applications use TCP/IP protocols and can
  communicate with each other.
• You can mix and match any Winsock application and
  connection and be sure they will work together.

10
(No Transcript)
11
Working on the Internet

• Businesses and Firewalls
• Intranets and Extranets
• Issues for Telecommuters

12
Working on the Internet - Businesses and
Firewalls

• Many businesses connect their LANs to the
  Internet, making their data vulnerable to access
  by unauthorized users, such as hackers.
• Businesses can use a firewall to control access
  to their network from the Internet, by persons
  outside the company.
• A firewall gives outsiders access to public areas
  of a network while restricting access to
  protected parts of the network.

13
Invalid password
STOP
14
(No Transcript)
15
Working on the Internet - Intranets and
Extranets

• Many organizations are configuring their internal
  networks to resemble the World Wide Web, so
  users can navigate them with a browser.
• An intranet is a LAN or WAN that uses TCP/IP but
  is accessible only to internal users. Intranets
  are not connected to the Internet.
• An extranet is an intranet that allows outside
  access via the Internet. Usually, external users
  must log in with an ID and password.

16
Working on the Internet - Issues for
Telecommuters

• A telecommuter is someone who works outside the
  workplace, but uses a computer and
  communications software to access the company's
  network, usually over the Internet.
• When accessing a corporate network online,
  telecommuters need to be aware of issues such as
  security, ownership of sensitive data, libel,
  and appropriate use of business resources.

17
Commerce on the World Wide Web

• The Web is a vehicle for electronic commerce
• (e-commerce), which simply means doing business
  online.
• For consumers, e-commerce means being able to
  securely shop, pay bills, and conduct other types
  of transactions online.
• For businesses, e-commerce means a new way to
  sell and distribute goods and services, and to
  expand markets beyond physical locations or
  geographical boundaries.

18
lesson 20 review

• Describe how to connect a computer to the
  Internet.
• Identify three kinds of high-speed data links
  commonly used to connect to the Internet.
• Describe the process of connecting a PC to the
  Internet through an ISP account.
• Explain what a firewall is, and the uses for a
  firewall.
• Define the terms intranet and extranet.
• Explain what is meant by e-commerce and how it
  affects consumers and businesses.