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Summary Grade 12 CAT module 2.1
Summary of module 2.1 for grade 12 learners
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CAT module 2.1 Internet connections andservices
The internet is a worldwide computer network.
A WAN is a network that is spread over a wide geographical area such
as a country, city, or even continent.
The purpose of a WAN is to facilitate the sharing of computer
resources, and the means of electronic communication over a wide
area.
The internet of things (IOT) is a trend for all things to connect to the
internet so that they can be monitored and controlled wherever you
are. These connected devices contain CPU’s, sensors and software.
Internet connections:
ISP- internet service provider:
ISP is a company that has a permanent, fast internet connection and
sells internet access and services to individuals and organisations for a
monthly fee.
The monthly fee depends on the type of access that is chosen.
Examples of ISPs: Vodacom, Telkom, MTN, MWEB etc.
ISPs offer the following services: email, web page hosting, wireless and
wired internet access, fax-to-email and spam filtering.
Criteria for types of internet connections:
In terms of internet connection most people would prefer a broadband-
a high speed, high-bandwidth connection to the internet.
Bandwidth: refers to the amount of data that can be transferred from
one point to another in a given period of time.
Factors to consider when choosing a broadband package consider the
following:
1. Mobility: do I want a fixed connection or is mobility essential?
2. The speed of the line or connection.
3. Cap: Amount of data
4. Shaped or unshaped: Shaped: preference is given to certain services
on the internet such as email, downloading and browsing. Unshaped:
All the internet services are given the same priority. Shaped connection
works well unless you want a specific need such as wanting to do a lot
of online gaming.
Wired versus wireless connections:
Wired connection- ADSL and fibre
ADSL (asymmetrical digital subscriber line) is a permanent digital
connection to the internet through a telephone line or a landline. The
, connection is split into 2 channels one for making normal calls and one
for connecting to the internet.
Fibre: Data is transmitted along glass tubes. Much faster than ADSL.
More bandwidth in the copper wires in ADSL.
Cost of connection:
The cost of your ADSL or fibre internet connection includes a monthly
ISP cost, depending on the chosen data package. For ADSL you also
pay a fixed monthly cost for the line rental and normal telephone rates.
ADSL provides cheaper connections to the internet than cellular
connections.
ADSL and fibre are more stable than cellular connections.
Fibre is much faster than ADSL
Fibre uses light and is not affected by electrical interference
Wireless connections- cellular technology:
3G/4G and LTE are the generations of cellular technology that are in
use.
A 3G or 4G dongle can be used for a desktop computer or laptop to
connect it to a cellular connection for internet access.
Advantage:
You can have mobile access to the internet using your mobile device.
Disadvantages:
If you are in an area that has poor cellular coverage, you will have
limited or slow access.
You can never escape communication, which can result in information
overload.
You might need to limit the amount of data you use.
Internet services:
Real-time messaging:
Instant messaging is like SMS without the cost.
WhatsApp, Twitter DM, Snapchat, Facebook messenger,
A chatroom is an online space that you go onto to chat with people-
usually strangers.
Advantages:
You can talk to more than one period at the same time in real time,
provides can opportunity to talk to people regardless of geographical
location, some applications are on a variety of operating systems, cost
effective etc.
Disadvantages:
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