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Summary CAT Grade 12 Module 2 Networks and Internet
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These summaries cover module 2.1-2.4 with an in-depth analysis of the work.
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, Module 2.1 Internet connections and servicesDe Internet is a worldwide computer network , consisting of computers ,
devices and networks that are linked using a form of communication media .
WAN Internet service provider
↳
Network spread over wide WISP is a company that has permanent ,
fast connection to the internet ,
sells internet access and services to an
geographical area individual or organisations for a
monthly fee .
w
Purpose ( to facilitate sharing
of computer resources )
w
£ ✗amples :
cell c ,
Vodacom , TelkomSA
w
Examples
-
Network businesses in their WISP offer these services : email ,
web page hosting , wireless and wired internet access , Fax to email +
spam filter
shops their countries
*Giᵗiaf°rTYPes0fTnternetaccessmwmwM
_-
in
-
Bank networks to ATMs
-
10T (internet ofThings )
↳ Prefer broadband -
high speed high bandwidth ,
connection to the internet
De¥ Bandwidth refers to the total amount of data that can be transferred from one point to another in a
given period time .
Measured in
kilobits per second Ckbps) or Megabits per second ( Mbps)
1. Mobility can you work with a fixed connection ?
2. Speed of the line or Connection , connections measured in kilobits or Megabits per second . ADSL 12 Mbps to 40 ) fasted fibre SA 1 GBPS
3. CAP ISP offer data bundles provide diff limitations amount of dat use a month . Most ISP with Throttle or slow down your
connection if use too much
4. Shaped and Unshaped that preference is
given to certain services on internet . Term unshaped means all internet services are
given the same
Priority . A shaped works well 1 Unless you have specific need leg gaming
.
online )
wired -
ADSL 1- Fibre wire less cellular Tech
* ADSL (Asymmetric Digital subscriber line ) is a permanent * Connect internet wirelessly using cellular Networks Provides mobile .
digital connection to internet
using normal landline or access .
( 36 and 46 / LTE )
telephone line (split .
2 Channels one is for phone calls ,
the other intent
* Can use a dongle for a
computer to give it internet access
* Fibre transmitted along glass tube earring
is more data ,
larger bandwidth makes it faster ADSL (copper wires )
•
To connect to internet have mobile access to internet
(need more bandwidth for downloading than
Uploading)
•
Area that has poor coverage , slow access
•
Never escape communication information overload ,
* Cost of connections Wifi people
◦
can
piggyback
↳
ADSL 1- Fibre costs include Monthly ISP and for ADSL you pay •
Limit amount of data you use
monthly rental line and for normal telephone calls .
•
Wifi is connecting to ADSL or Fibre wines sly in small area known as HOTSPOT .
•
ADSL Provides cheaper connections to the internet than Cellular ones when you connect ask password after connect automatically
•
ADSL 1- Fibre more stable than cellular connections .
not affected issues
Fibre provides faster BYOD ( Bring Device) people bring
•
stable internet ADSL device not rely others
•
, cheaper , more connections to your own their own
•
ADSL speed drops further away you are , ADSL better Ubon areas , fibre distance not prob . -
•
Fibre uses light not affected EI but ADSL is
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