First a recap on networks
What is a stand alone PC
What is a LAN
Name 5 advantages of a LAN
What is a WAN
Name 1 advantage and 1
disadvantage with a WAN
How good is a
What type of network is this
and how good is it?
What is this network and how
does it work?
Transmission speeds in a network are
measured in (Kbps or now Mbps or even
The faster the transmission speed, the more
data can be transferred. Transmission
speed is called ‘bandwidth’
If a network does not have enough
bandwidth, it will be slow!
Network with high bandwidth
This network has enough bandwidth to cope with all of
the data travelling across it!
Network with low bandwidth
As the amount of data travelling between computers
increases, the network gets slower and slower!
Making a LAN into a WAN
How would you connect a LAN to the
A gateway is used to translate data between one network
Internet or make a LAN into a WAN?
The internet or another LAN
How would you connect a stand
alone PC to the Internet?
To access the internet a modem is needed
A modem sends and receives analogue
information through phone lines
Broadband carry digital signals so rather than
a modem you would use a terminal adapter
Computers connected to the internet
have different transmission speeds
(measured in Kbps or now Mbps)
If a computer has low bandwidth, its
connection to the internet will be slow!
How to get more bandwidth
You can get more bandwidth than you can
from a standard 56K modem?
Get an ISDN or ADSL line and subscribe to
These newer lines are not analogue but
digital – this means they are much faster
You need a special broadband modem
which is actually called a terminal adaptor
But –typically this is more expensive