[CSig] Internet

[CSig] Internet

By Andy tsui

Objective

Subject | Subject

Some text here about the topic of discussion

• ​Understand the difference between the internet and the world wide web

• ​Understand what is meant by a uniform resource locator (URL)

• Describe the purpose and operation of hypertext transfer protocol (HTTP) and hypertext transfer protocol secure (HTTPS)​

• ​Explain the purpose and functions of a web browser

Pair and share

"What is Internet????"

Multiple Choice

What kind of switching method is used in Internet?

• Circuit

• Power

• Data

• Packet

Multiple Choice

What's the name of the network, that later became Internet?

• APENET

• APARNET

• ARANET

Internet

• Internet: Inter Connected Network

• Largest computer network which connects devices globally

• Internet is open - anyone can join

• Data is exchanged using packet switching

Open Ended

What is WWW (World wide web)?

​WWW ≠ Internet

• WWW is a collection of linked webpages (hyperlink) that can be found on Internet

• Use Browser to access

• ​One of the application of Internet

WWW

• Internet is the infrastructure

• Allow data exchange between devices​

• Allows many applications built on top of it​

Internet

WWW vs Internet

Open Ended

Brainstorm and give some other application on the Internet

Internet Protocol (IP) Address

• Each device on the Internet needs an unique address

• ​IPv4 address is a 32-bit number which is used to locate a particular device

• Usually written in this format:

  202.175.3.6 (each number is 8-bit, 0 to 255)

• IP Address contains the geological location of a device

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

Use this website:

https://www.iplocation.net/

and find the location of the following address:

23.236.48.6

• Macau

• USA

• UK

• China

Open Ended

Try if you can find an address from UK

IPv6

• IPv4 allows about 4 Billion (2^32) of unique addresses - not enough for all devices to have their own address

• IPv6 is the next version of IP address - contains 128 bit of addresses

Subject | Subject

Some text here about the topic of discussion

Multiple Select

What is the function of IP address?

• To identify a device on Internet

• To locate a device on Internet

• Identify the function of a device

URL

• Uniform Resource Locators (URL) is text address to locate resources on Internet

• It can be:

  • Webpage

  • An image, or other multimedia content

  • etc.

​https://www.acm.edu.mo/about/index.html

host and domain name

Basically indicating a server compute​r

​protocol:

usually http and https​

​path and filename

HTTP/S

• Hypertext transfer protocol (HTTP)

• Protocol (Set of rule) to allow browser to communicate with WWW server

• HTTPS (Secure) is a secure version of HTTP, which allows data transmitted to be encrypted

Subject | Subject

Some text here about the topic of discussion

Open Ended

What is meant by data is encrypted?

Web browser

• Browser is a software that allows users to access web pages

• HTML - Hypertext markup language, contains structure of a webpage

• CSS - Cascade Stylesheet, contains formatting of the webpage

• Javascript - The programming language to allow interaction in a webpage​

​Watch this video and answer questions about cookie

Open Ended

What is the function of Internet Cookie?

Open Ended

What might be the potential security issue related to cookie?

Open Ended

[Exit question] What is the function of Internet Browser?