Page 5 - Nourhan
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Open network Closed network
It is part of the open network, but it is
It is open and accessible to all
specific to a specific part
Ex: internet
Ex: school lab
A timeline of the technological development of the internet
➢ 80s (Dial up internet connection)
Used phone line to connect to internet, it’s slow but stable connection.
Couldn’t use phone when on internet.
➢ Late 80s (Digital Subscriber line (DSL)
A high-speed connection that uses phone wires to connect to the
internet.
Allowing the phone and the internet to be used simultaneously (at the
same time).
➢ 90s (Emergence of the world wide web)
WWW is a large set of web pages that are linked to each other using
hyperlinks.
➢ 2000+ (Wi-Fi devices)
You can access the internet from your smartphone through Wi-Fi,
Portable internet service and Hotspots.
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