Please enable JavaScript.
Coggle requires JavaScript to display documents.
2.0 - Internet Technology (2.3 - Classification of Network (LAN (Network…
2.0 - Internet Technology
2.1 - Basic Concept of Network
Collection of
computers
and
devices
connected together
via
communications devices
and
transmission media.
Communication Devices
Hardware capable of
transmitting data, instructions, and information
between a
sending device
and a
receiving device.
Dial-up modem
A dial-up modem is a communications device that can
convert digital signals to analog signals
and
analog signals to digital signals
,
so that data can travel along an analog telephone line.
The dial-up modem
connects the computer to standard phone lines
, which serve as the
data transfer medium
. When a user
initiates a dial-up connection
, the modem
dials a phone number of an Internet Service Provider (ISP)
that is designated to receive dial-up calls. The
ISP then establishes the Internet connection
, which usually takes about ten seconds and is accompanied by several beeping an buzzing sounds.
Digital Modem
A digital modem is a communications device that
sends and receives data or information
to and from a
digital line
.
Cable modem
DSL modem
Digital Subscriber Line
ISDN modem
Integrated Services Digital Network
Wireless Modem
Which have an external or built-in antenna, are available as
USB flash drives
PC Cards
ExpressCard
Memory cards
Network Card
A Network card or Network Interface Card (NIC)
allows a computer to connect to a network
.
Wired Connection
Wireless Connection
Wireless Access Points
A wireless access point (WAP) is a hardware device that
allows wireless capable devices
and
wired networks
to connect through a wireless standard such as Wi-Fi
Hub and Switch
Each serves as a central connection for all network equipment.
Hub
Switch
Router
A router is a device connected to
two or more networks
that
allows the router to transmits data
from
one network to another
until its reach correct destination on the network.
Transmission Media
Consist of
materials or substances
capable of carrying
one or more signals
data, instructions, or information travel in a communications system.
Wireless Transmission Media
Send
communications signals
through the
air or space
using
radio
,
microwaves
, and
infrared signals
.
Physical Transmission Media
Use
wire, cable,
and
other tangible materials
to
send communications signals.
2.4 - Introduction to The Internet
Internet
is the
largest computer network
,
connecting millions of computers
and
devices around the world.
Advantages
Entertainment
Social networking
Information resources
E-commerce
Faster communication
Disadvantages
Theft of Personal information
Immorality
Security Problems
Accuracy of Information
Virus threat
Categories of Networks
Intranet
Internal network
which only
available inside an organization.
Extranet
Is an
extension of intranet
to some
entities outside the organization.
Internet
Global network
that
connect computers all over the world.
2.6 - The Internet Address
A sequence of number that
uniquely identifies
each
computer or device connected
to the
Internet.
Also called an
IP address
(Internet Protocol address)
The protocol that provides for
addressing
and
routing Internet packets
from one computer to another computer.
IPv6
Has more
capabilities than IPv4
, including
providing for far more IP address
First three(3) portion
is for
Global Prefix (Identify the network).
Fourth portion
is for
Subnet (Identify the location within the network).
Example:
2001:0db8:3c4d:0015:0000:0000:abcd:ef12
Last four portion
is for
Interface ID (Identify the specific computer).
Eight group
of
four hexadecimal number.
128-bit.
Domain Name
The
text version
of an
IP address.
Top-level domain (TLD):-
The
last section
of the
domain name.
generic Top-level domain (gTLD):-
Identifies the
type of organization
associated
with the
domain.
Domain Name System (DNS): -
Method
that the Internet uses
to store domain names
and
their corresponding IP addresses.
country code Top-level domain (ccTLD):-
Domain name
that includes a
country code
which has
two letter code
.
IPv4
A
unique 32-bit number
assigned to
network devices
that
use Internet Protocol.
Example:
10.100.255.0
First portion
of each IP address identifies
the network.
Last portion
identifies the
specific computer.
2.3 - Classification of Network
Local Area Network (LAN)
Network that
connects computers and devices
in a
limited geographical area
such as a
home
,
school computer laboratory
,
office building
or
closely positioned group of buildings.
Wide Area Network (WAN)
Network that covers a
large geographic area
such as a
city
,
country
, or the
world
.
Enterprise Private Network (EPN)
Network
build by an enterprise to interconnect various company sites
such as
production sites
,
head offices
,
remote offices
and
shops
.
Virtual Private Network
Network that is
constructed using public network usually the Internet
to
connect
remote users
or
regional offices to a company's private internal network
.
LAN
Network Size - Small
Transmission Speed - Fastest
Cost - Low
Number of computer connected - Smallest
WAN
Network Size - Large
Transmission Speed - Slowest
Cost - Higher
Number of computer connected - Largest
2.5 - The Broadband Internet Connection
Transmission media
that
transmits multiple
signal
simultaneously.
Wired
DSL (digital subscriber line)
Fiber to the Premises (FTTP)
Cable Internet service
Wireless
Mobile broadband
Fixed wireless
Wi-Fi (wireless fidelity)
Satellite Internet service
2.2 - Network Architecture
Describes how a
computer network is configured
and
what
strategies are being used
.
Client/Server
One or more computers act as a server
, and the
other computers on the network request services from the server.
Logical
Physical
Advantage
A client/server can be scaled up to many services.
Security is more advance.
Disadvantage
More expensive.
When the server goes down all the computers connected to it become unavailable to use.
Peer-to-peer
Each computer, called a peer has
equal responsibilities and capabilities
, sharing hardware, data, or information
with other computers
on the peer-to-peer network.
Logical
Physical
Advantage
Easier to set up.
Less expensive.
Disadvantage
Unsecure
Difficult to make a data recovery or backup.
