Unit 7.3 : Accessing the Internet (PART 2)

Unit 7.3 : Accessing the Internet (PART 2)

Class Rules

• Respect the teacher

• Don't be loud

• No walking around

• Pay attention to the lesson and participate

• No games/social media/etc. Only educational websites relevant to the lesson.

Unit 7.3 : Accessing the Internet

Accessing web pages : DNS

• Domain Name System

• Translates URL into an IP address.

• Makes it easier for you to access websites.

• For example : when you type www.google.com, it will be translated to 209.85.231.104 by DNS.

Multiple Choice

What does IP stands for?

• Internet Prototol

• Internet Protol

• Internet Protocol

• Intenet Protocol

Unit 7.3 : Accessing the Internet

Accessing web pages : DNS

Multiple Choice

What does URL stands for?

• Uniform Resource Locations

• Uniform Resource Locator

• Uniform Remote Locations

• Uninformed Resource Locations

Unit 7.3 : Accessing the Internet

Steps to translate URL to IP address

• User types URL (www.youtube.com) into web browser

• DNS Server finds matching IP address

• If IP not found, higher level DNS (larger list of DNS).

  • If still not found 404 error is returned

• If IP address found, web browser sends request to the IP address so that web page is returned

Multiple Choice

Whats the function of web browser?

• Used to store files.

• Used to access hidden, secret files

• Used to identify devices uniquely

• Used to access files/websites by typing URL

Exercise

1. Is all websites secure?

2. What does SSL stand for?

Exercise

1. What is encryption?

2. Padlock icon is located at __ bar

Exercise

Does it mean the websites need to always be secured?

Unit 7.3 : Accessing the Internet

Padlocks

• If present, that page has an SSL certificate.

• The certificate indicates the owner of website is genuine.

• Also means data to and from this website is secure.

• Because they are encrypted (scrambled)

Unit 7.3 : Accessing the Internet

HTTP and HTTPS

• These are protocols used to send and receive data

• Normally you can see https://www.google.com

• HTTPS is a more secure protocol compared to HTTP

• HTTPS is normally used for websites that needs higher security like banking websites, shopping websites or any websites where you can purchase.

Complete the practice (1-4)

Multiple Choice

What's a DNS server?

• Used to store domain names systems and corresponding IP address

• Used to store domain names only

• Used to store domain names and corresponding IP address

• Used to store domain names systems only

Multiple Choice

P in HTTPS stands for

• Prototype

• Proton

• Protocol

• Progress

Multiple Choice

What's does error 404 indicate?

• No internet

• The device you're using is not suitable

• Your storage is full

• URL searched for does not correlate to any server IP address

Multiple Choice

What's the function of Domain Names?

• Makes it easier for the user to find someone's device.

• Makes it easier for the user to find websites/files

• Used to identify devices connected to internet

• Used to store files

Multiple Choice

What does the padlock icon indicates?

• The website has SSL certificate

• The website is hacked

• The website is locked

• The website is not found