Quick Reference Study Notes for Computer Networks (Advanced)

COMPUTER NETWORKS (Internet Concepts)

1. What the Internet is used for

The Internet connects individuals and information through Email, Games, Social Media, Banking, Entertainment and Video Chat.
-DO use the World Wide Web to enrich your life by providing better access to information and an additional way to communicate.

2. There are risks on the Internet

There are risks on the Internet mainly associated to the difficulty with keeping things private on a technology designed for sharing, knowing who or what to trust and proving you are who you say you are.
–DO remember the dangers online and learn to minimize risk.

3. The Internet is made of connected computers
The Internet is millions of computers linked together in a way that enables information to flow freely between them. The technology used is very trusting and there is no security built into the Internet, it is always something extra.
–DO certify that security has been applied where you are giving or receiving valuable information.

4. What is an ISP (Internet Service Provider)
An ISP is a service that provides a connection to the web. They can give service to a fixed point, like a home or to a mobile point, like a cellular telephone.
–DO look for a 3G, 4G or LTE symbol on your smartphone before using the Internet to ensure a reliable connection.

5. The Internet at home
Broadband Internet connections allow home networks to access the Internet. Wireless home networks (Wi-Fi) should be used with the safety features turned on.
–DO secure your home Wi-Fi network with a password, using WPA or WP2 as the secure type of options.

6. The Internet outside the home
Networks outside the home can be less secure than a home network because more and more people use them. It is important to take extra care when sharing if you are connected to those networks.
–DO take care what information you share when connecting to public networks, wherever possible avoid sensitive transactions.
–DO use your 3G or 4G connection if you have to send or receive private data outside the home.


Glossary of terms-

3G- The 3rd Generation Mobile telephone standard, capable of supporting telephony, web access video calls and TV.

4G- The 4th Generation Mobile telephone standard, capable of supporting internet access, gaming, HD TV, video conferencing and other services.​​​​​​​

ADSL- Asynchronous Digital Subscriber Line is a kit of technologies that allow for high-speed computer communications over a telephone wire at the same time as a telephone service.

Co-axial Cable- Co-axial Cable is a shielded communications cable that enables for the transfer of electric signals over a copper conductor.

Crowd-sourced- A system of making use of a large group of people to make decisions or perform work through solicited contributions instead of using traditional employees or suppliers.

Digitization- The conversation of data to a digital form.

DSL- Digital Subscriber Line is a set of technologies that allow for high-speed computer communications over the telephone wire.

Email- Electronic Mail.

Fibre Optic- Flexible, transparent glass or plastic cable that can transfer light from one end of the cable to the other end.


Fixed Wireless- High-speed wireless.

Internet Protocol- The protocol that regulates the transmission of data packets across the web.

Internet Service Provider- A company that avails access to the Internet as a service to subscribers.

LTE- Long Term Evolution is a protocol that allows for the provision of 4th generation mobile telephone services with greater efficiency and performance.

Protocol- A set of rules and conventions for the transfer of data between devices.

Router- A device that manages the routing of data between computers and networks.

Social Media- A service designed to provide tools for socialising with others across the world wide web.

Transmission Control Protocol- The protocol that regulates the formation and assembles of data packets for transfer across the Internet.

Video Chat- An Internet services that allow persons to chat while seeing each other with the simultaneous bi-directional, real-time video feed.

Wi-Fi- A set of wireless computer networking technologies that support small networks.

Wi-Fi base station- A set of devices that provides for a Wi-Fi network and often allows connection to a wired network.

Wireless- Sending and receiving electronic transmitted signals by using radio waves.

WPA, WPA2- Wi-Fi Protected Access and Wi-Fi Protected Access 2 are two security protocols designed to protect Wi-Fi networks. These protocols were developed to resolve problems in the earlier ‘Wired Equivalent Privacy”(WEP) security protocol.

*NOTE : "This study material is collected from multiple sources to make a quick refresh course available to students."​​​​​​​

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