1:16 AM
What is Network?
- A
network is a group of connected computers that communicate, exchange
information and share resources
- Benefits
of Network
n
Users access programs and data
simultaneously
n
Users share printers and scanners
n
Users communicate more easily
n
Users backup their data more
easily
File Server
- A
computer that stores data files for networked users to access
- Permission
Levels on Files
n
Read / Write
n
Owner / Group / Other
n
Supervisor
Personal Communications
o
E-mail
o
Teleconferences
o
Videoconferences
Backup
Ø
Easier if important files stored
on network drives
Ø
The network manager makes regular
backups
Types of Area Networks
o
Tiny area network (TAN)
n
Connects several computers in a
home
o
Local area network (LAN)
n
Limited by geography
o
Campus Area Network (CAN)
n
Different offices are linked
o
Metropolitan area network (MAN)
n
Connects multiple corporate
networks together
o
Wide area network (WAN)
n
National or international networks
Protocol
o
Rules and formats for sending and
receiving data along the LAN
o
Kinds of Protocols
n
TCP/IP
n
IPX/SPX
n
NetBEUI
n
Other non-PC protocols
o
SDLC
o
Decent
o
X.25
Connecting Networks
o
Connecting Similar LANs
n
Hub
n
Bridge
n
Router
o
Connecting networks that use
different protocols
n
Gateway
Peer-to-Peer Networks
o
Sometimes called a workgroup
o
Nodes share files and data with
each other vs. client/server networks, where nodes share files and data only
with the server
Network Features
o
Topology: Physical or logical
layout of cables and devices that connect the network nodes
o
Media: wires and cables that carry
data from source to destination
o
Bandwidth: amount of data media
can carry
Kinds of Topologies
o
Bus topology
o
Star topology
o
Ring topology
o
Mesh topology
o
Wireless topology
Network Software
o
The group of programs that manages
the network resources is called the network operating system (NOS)
o
Examples of Noses
n
Novell NetWare
n
Microsoft Windows NT Server
n
Microsoft Windows 2000
n
Microsoft XP
n
Microsoft .NET Server
n
Linux
What is the Internet?
The Internet is the pipeline that carries data between
computers.
Internet is a net in the world. The Internet is a global system of interconnected computer network. It
is a network of private, public business, and government networks. Most
traditional communications media including music, film, and television are
reshaped or redefined by the Internet, giving birth to new service. Newspaper,
book and other print publishing the internet. The origins of the Internet reach
back to research of the 1960sThe funding of a new U.S. In 1980s, as well as
private funding for other commercial Internet. In the 1990s an international
network resulted in its popularization. As of 2011, more than 2.1 billion
people nearly a third of internet.
How
the Internet Works - TCP/IP
o
Every computer and network on the Internet uses the same protocols (rules and procedures) to control timing and data format.
o
The protocol used by the Internet is the Transmission Control Protocol/Internet Protocol, or TCP/IP.
o
No matter what type of computer system you connect to the Internet, if it uses TCP/IP, it can exchange data with any other type of
computer.
Two
Kinds of Internet Addresses
Ø
Internet protocol address (IP address): four-part numeric
address
Ø
Routing Traffic Across
the Internet
Ø
Domain name system (DNS) address: an address that uses words
instead of numbers
How
the Internet Works- Domains and Subdomains
o
In addition to an IP address, most Internet hosts or servers
have a Domain Name System (DNS) address, which uses words.
o
A domain name identifies the type of institution that owns the computer. An Internet server owned by IBM might have
the domain name ibm.com.
o
Some enterprises have multiple servers, and identify them with
subdomains, such as products.ibm.com.
Connecting
to the Internet
o
Many home users connect via an ISP
o
AOL is an example of an online service provider
n
Provides access to email, discussion groups, databases,
services
n
Other provides include CompuServe, Prodigy and MSN
o
Work and School provide connection via a gateway off their LAN
Internet
Communications
o
World Wide Web
o
Email
o
FTP
o
IRC
o
Newsgroups
o
Telnet
o
Peer-to-Peer – IM
Tools of
using internet-
1.
Personal Computer
2.
1 Modem Connection in pc.
3.
Using Web Browsing Software
Some
web browsing Software & Download Now
1.
Internet
Explorer
2.
Firefox Setup 9.0.1
3.
Opera-Next-12.00-1325
4.
comodo
5.
flock-2.6.1.en-US.win32
6.
comit bird
7.
See monkey
8.
chrome_installer
9.
mx3.1.4.1000
10.
Safari
Setup
11.
Avant
12.
webearth
