Understanding Internet Connections and Services

 
Internet
connections
and services
 
MODULE 2.1
2
The 
internet
 
 
Worldwide computer network, consisting  of
computers, devices and networks linked
using some form of communication media
Introduction
 
It is two or more computers
and/or devices connected
together via a communication
medium such as a cable or
wirelessly so that data and
information can be shared.
Two forms of network
connections:
LAN’s (Local Area Networks)
WAN’s (Wide Area Networks)
 
What is a Network?
 
LAN – Local Area Network.
Computers connected in a LAN
are connected over a short
distance such as a campus,
office building, classroom etc.
 
LAN – Local Area Network
 
What do you need to be
connected in a Network?
 
Hardware Devices
(Computers/Printers)
Communication media (Wired or
wireless)
Network Interface Card
Network Software
 
WAN
A n
etwork spread over a wide
geographical area
, such as a city,
country or even continents
 
6
 
A 
WAN is a wide network of computers
that is spread over a large geographical
areas such as cities, countries and
continents.
There are many communication
media to connect a WAN together.
Some examples are:
Cables
Satellite
Radio Waves
Microwave
 
WAN (Wide Area
Network)
 
To facilitate communication
between users over large
distances
Share a centralised data source
Connect LANs together
 
 
Purpose of a WAN
 
Examples of WANs:
Bank networks such as Nedbank or
ABSA (Offices in cities around the
country)
The Internet (which can also be
referred to as a GAN – Global Area
Network)
 
Examples of WANs
 
Internet connections
 
10
 
The Internet is a worldwide computer network that
consists of computers and networks that are
linked using phone lines, satellite, microwave and
undersea cables in order to communicate and
share resources.
 
The Internet
 
The Internet is used every day by millions of people in
order to stay “in contact”  with the world around them.
People use the Internet to:
Communicate – via Email, Social Networks,
Etc.
Shop on-line
Check weather
Do business etc.
 
Getting Connected …
 
The Internet and connectivity has
become an integral part of modern
live
Access to the Internet means access to the
services that the Internet offers.
The services have helped us to communicate with
more people in via text, voice and video.
It has changed the way we process, store and
share information.
 
Internet Services
Internet Service Provider
ISP
Company that has a
permanent, fast
connection to the
internet and that sells
internet access and
services for a monthly
fee
14
 
 
 
15
ISP services
 
Most people prefer
 
broadband
 
a high-speed,
high-bandwidth connection to the internet
 
16
 
Criteria for types of
internet connections
 
ADSL : 
Permanent digital connection to the
internet using a normal telephone line.
Split into two channels: one for phone calls and
one for internet.
Fibre :
 data is transmitted along thin glass fibre
tubes. Much faster than electrical transmission
over copper cables used in ADSL.
 
 
17
 
Wired versus wireless
connections (I)
Wired connections – AD
SL or Fibre
 
M
onthly ISP cost
 and a fixed monthly cost for the
line rental
 (ADSL)
Advantages
, Disadvantages, Limitations
ADSL – cheaper than cellular connections
ADSL – speeds drop the further you are away from the exchange
ADSL and fibre – more stable than cellular connections
Fibre – faster, cheaper and more stable than ADSL or cellular
Fibre – not affected by electrical interference
18
Wired connections – AD
SL or Fibre
Wired versus wireless
connections (II)
 
Internet connectivity without an ADSL or fibre line
3G or 4G dongle on a desktop / laptop to connect
to cellular network for internet access
Smartphone / tablet used as a personal 
WiFi
hotspot to connect other devices to the internet
19
Wired versus wireless
connections (III)
Wireless connections – 
cellular technology
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Explore the world of internet connections and services, from local area networks (LANs) to wide area networks (WANs). Learn about the hardware and software required to connect devices, the purpose of WANs, and examples of WAN implementations in banks and the global internet.


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  1. Internet connections and services MODULE 2.1

  2. 2 Introduction The internet Worldwide computer network, consisting of computers, devices and networks linked using some form of communication media

  3. What is a Network? It is two or more computers and/or devices connected together via a communication medium such as a cable or wirelessly so that data and information can be shared. Two forms of network connections: LAN s (Local Area Networks) WAN s (Wide Area Networks)

  4. LAN Local Area Network LAN Local Area Network. Computers connected in a LAN are connected over a short distance such as a campus, office building, classroom etc.

  5. What do you need to be connected in a Network? Hardware Devices (Computers/Printers) Communication media (Wired or wireless) Network Interface Card Network Software

  6. 6 WAN A network spread over a wide geographical area, such as a city, country or even continents Businesses and shops WAN Bank networks The internet (GAN)

  7. WAN (Wide Area Network) A WAN is a wide network of computers that is spread over a large geographical areas such as cities, countries and continents. There are many communication media to connect a WAN together. Some examples are: Cables Satellite Radio Waves Microwave

  8. Purpose of a WAN To facilitate communication between users over large distances Share a centralised data source Connect LANs together

  9. Examples of WANs Examples of WANs: Bank networks such as Nedbank or ABSA (Offices in cities around the country) The Internet (which can also be referred to as a GAN Global Area Network)

  10. 10 Internet connections

  11. The Internet The Internet is a worldwide computer network that consists of computers and networks that are linked using phone lines, satellite, microwave and undersea cables in order to communicate and share resources.

  12. Getting Connected The Internet is used every day by millions of people in order to stay in contact with the world around them. People use the Internet to: Communicate via Email, Social Networks, Etc. Shop on-line Check weather Do business etc.

  13. Internet Services The Internet and connectivity has become an integral part of modern live Access to the Internet means access to the services that the Internet offers. The services have helped us to communicate with more people in via text, voice and video. It has changed the way we process, store and share information.

  14. Internet Service Provider 14 ISP Company that has a permanent, fast connection to the internet and that sells internet access and services for a monthly fee

  15. ISP services 15 Email Web page hosting Wireless and wired internet access Fax-to-email Spam filtering

  16. Criteria for types of internet connections 16 Most people preferbroadband a high-speed, high-bandwidth connection to the internet Criteria Shaped and unshaped Speed of line or connection Mobility Cap

  17. Wired versus wireless connections (I) 17 Wired connections ADSL or Fibre ADSL : Permanent digital connection to the internet using a normal telephone line. Split into two channels: one for phone calls and one for internet. Fibre : data is transmitted along thin glass fibre tubes. Much faster than electrical transmission over copper cables used in ADSL.

  18. Wired versus wireless connections (II) 18 Wired connections ADSL or Fibre Monthly ISP cost and a fixed monthly cost for the line rental (ADSL) Advantages, Disadvantages, Limitations ADSL cheaper than cellular connections ADSL speeds drop the further you are away from the exchange ADSL and fibre more stable than cellular connections Fibre faster, cheaper and more stable than ADSL or cellular Fibre not affected by electrical interference

  19. Wired versus wireless connections (III) 19 Wireless connections cellular technology Internet connectivity without an ADSL or fibre line 3G or 4G dongle on a desktop / laptop to connect to cellular network for internet access Smartphone / tablet used as a personal WiFi hotspot to connect other devices to the internet

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