Why understanding the web empowers users in Intro to Computing - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the main part of a web address.

Intro to Computing

url = 'https://www.example.com'
main_part = url.split('[1]')[1]
print(main_part)

Drag options to blanks, or click blank then click option'

A://

B//

C.com

Dwww

Attempts:

3 left

💡 Hint

Common Mistakes

Using '//' instead of '://' causes wrong splitting.

The code splits the URL at '://', so the main part is after this.

2fill in blank

medium

Complete the code to check if a web address starts with 'https'.

Intro to Computing

url = 'https://secure.site'
if url.[1]('https'):
    print('Secure connection')

Drag options to blanks, or click blank then click option'

Acontains

Bendswith

Cstartswith

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'contains' or 'find' does not check the start specifically.

The startswith method checks if the string begins with the given text.

3fill in blank

hard

Fix the error in the code that extracts the domain name from a URL.

Intro to Computing

url = 'http://openai.com'
domain = url.split('[1]')[1]
print(domain)

Drag options to blanks, or click blank then click option'

A://

Bhttp://

Cwww.

D.com

Attempts:

3 left

💡 Hint

Common Mistakes

Splitting by 'http://' causes the first part to be empty.

Splitting by '://' correctly separates the protocol from the domain.

4fill in blank

hard

Complete the code to create a dictionary of web pages and their status codes.

Intro to Computing

pages = ['home', 'about', 'contact']
status_codes = {page: 200 for page in pages if page [1] 'home'}

Drag options to blanks, or click blank then click option'

A:

B==

C!=

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' instead of ':' in dictionary comprehension.

Using '==' instead of '!=' in the condition.

The dictionary comprehension uses ':' to map keys to values and '!=' to filter out 'home'.

5fill in blank

hard

Fill all three blanks to filter and transform a list of URLs.

Intro to Computing

urls = ['http://site1.com', 'https://site2.com', 'ftp://site3.com']
secure_sites = [url[1] for url in urls if url.[2]('https') and url.[3]('.com')]

Drag options to blanks, or click blank then click option'

A[8:]

Bstartswith

Cendswith

D[7:]

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong slice index.

Using 'contains' instead of 'startswith' or 'endswith'.

We slice from index 8 to remove 'https://' prefix, check if URL starts with 'https', and ends with '.com'.

Practice

1. Why is it important to understand how the web works when you use the internet?

easy

A. It lets you build your own computer hardware.

B. It allows you to avoid using any passwords.

C. It guarantees faster internet speed everywhere.

D. It helps you use the internet safely and make smart choices.

Solution

1. Step 1: Understand the role of web knowledge

   Knowing how the web works helps users recognize risks and benefits online.

2. Step 2: Connect knowledge to safe usage

   Using this knowledge, users can protect their data and avoid scams.

3. Final Answer:

   It helps you use the internet safely and make smart choices. -> Option D

4. Quick Check:

   Understanding the web = safer, smarter use [OK]

Hint: Think about safety and smart choices online [OK]

Common Mistakes:

• Confusing web knowledge with hardware skills
• Assuming web knowledge changes internet speed
• Believing passwords are unnecessary

2. Which of the following is the correct way to describe how your device connects to the web?

easy

A. Your device sends a request to a server, which sends back information.

B. Your device creates information and stores it only locally.

C. Your device connects directly to other devices without servers.

D. Your device sends information only through email servers.

Solution

1. Step 1: Identify the web connection process

   The web works by devices requesting data from servers.

2. Step 2: Match the correct description

   Your device sends a request to a server, which sends back information correctly states the request-response model between device and server.

3. Final Answer:

   Your device sends a request to a server, which sends back information. -> Option A

4. Quick Check:

   Device requests data from server = Your device sends a request to a server, which sends back information. [OK]

Hint: Remember: web = request from device, response from server [OK]

Common Mistakes:

• Thinking devices work without servers
• Confusing local storage with web connection
• Assuming email servers handle all web data

3. Look at this simple flowchart of a web request:



What is the correct order of steps when you click a link on a webpage?

medium

A. Server sends data -> Device sends request -> Device displays data -> Server processes request

B. Device sends request -> Server processes request -> Server sends data -> Device displays data

C. Device displays data -> Server processes request -> Device sends request -> Server sends data

D. Server processes request -> Device sends request -> Server sends data -> Device displays data

Solution

1. Step 1: Follow the flowchart steps in order

   The flowchart shows the sequence starting with the device sending a request.

2. Step 2: Confirm the logical order of web communication

   The server processes the request, sends data back, and the device displays it.

3. Final Answer:

   Device sends request -> Server processes request -> Server sends data -> Device displays data -> Option B

4. Quick Check:

   Request -> Process -> Send -> Display = Device sends request -> Server processes request -> Server sends data -> Device displays data [OK]

Hint: Trace the flow from device to server and back [OK]

Common Mistakes:

• Mixing up the order of sending and processing
• Thinking server sends data before request
• Confusing display step with sending request

4. A user complains that when they click a link, the page never loads. Which of these is the most likely cause based on how the web works?

medium

A. The server processed the request twice.

B. The server sent data but the device ignored it.

C. The device never sent a request to the server.

D. The device displayed the data before sending a request.

Solution

1. Step 1: Understand the web request process

   For a page to load, the device must send a request to the server.

2. Step 2: Identify the cause of no page load

   If the page never loads, likely the request was never sent, so no data returned.

3. Final Answer:

   The device never sent a request to the server. -> Option C

4. Quick Check:

   No request = no page load [OK]

Hint: No request means no response, so no page load [OK]

Common Mistakes:

• Assuming server sends data without request
• Thinking device can display data before request
• Believing server processing twice causes no load

5. Imagine you want to protect your personal information online. Which understanding about the web helps you do this best?

hard

A. Knowing that your device sends requests to servers and you control what data is sent.

B. Believing that all websites automatically protect your data without your action.

C. Thinking that using any public Wi-Fi means your data is always safe.

D. Assuming that once data is sent, you can delete it from the internet instantly.

Solution

1. Step 1: Understand data flow on the web

   Your device sends requests and data to servers; you decide what to share.

2. Step 2: Connect understanding to data protection

   Knowing this helps you control your information and avoid oversharing.

3. Final Answer:

   Knowing that your device sends requests to servers and you control what data is sent. -> Option A

4. Quick Check:

   Control over data sent = better protection [OK]

Hint: Control what your device sends to protect data [OK]

Common Mistakes:

• Trusting all websites without caution
• Assuming public Wi-Fi is always safe
• Believing data can be instantly deleted online