Serverless computing basics in Intro to Computing - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Serverless Event Triggers

Which of the following best describes how serverless functions are typically triggered?

A Serverless functions are triggered automatically by specific events like file uploads or HTTP requests.

B Serverless functions run continuously on a dedicated server waiting for manual start.

C Serverless functions require a user to log in to start the server manually.

D Serverless functions run only when the server is restarted.

💡 Hint

Think about how serverless functions respond without needing a server always running.

Serverless functions are event-driven, meaning they start automatically when an event occurs, such as a user uploading a file or sending a web request.

❓ trace

intermediate

Tracing Serverless Function Execution

Consider a serverless function that runs when a user uploads a photo. The function resizes the photo and stores it. What is the correct order of steps in this process?

A 2,1,3,4

B 1,2,3,4

C 1,3,2,4

D 3,1,2,4

💡 Hint

Think about what happens first and what triggers the function.

The user uploads the photo first, which triggers the serverless function. Then the function resizes the photo and saves it back.

❓ Comparison

advanced

Comparing Serverless and Traditional Servers

Which of the following statements correctly compares serverless computing with traditional server hosting?

A Traditional servers automatically scale with demand, serverless does not.

B Serverless requires managing physical servers, while traditional hosting does not.

C Serverless automatically scales and charges only for actual usage, traditional servers usually have fixed costs regardless of usage.

D Traditional servers run code only when triggered by events, serverless runs code continuously.

💡 Hint

Consider how billing and scaling differ between the two.

Serverless computing automatically scales with demand and charges based on actual usage, while traditional servers often have fixed costs and require manual scaling.

❓ identification

advanced

Identifying Serverless Benefits

Which of the following is NOT a typical benefit of using serverless computing?

A Pay only for the compute time used.

B No need to manage or maintain servers.

C Automatic scaling based on demand.

D Guaranteed zero latency for all requests.

💡 Hint

Think about what serverless can and cannot guarantee about performance.

Serverless computing offers many benefits, but it cannot guarantee zero latency because network and cold start delays can occur.

🚀 Application

expert

Choosing Serverless for a Use Case

You are designing an application that sends notifications only when users perform specific actions, which happen irregularly. Which reason best explains why serverless computing is a good choice here?

A Serverless allows you to pay only when notifications are sent, saving costs during idle times.

B Serverless computing is not suitable for event-driven tasks like notifications.

C Serverless functions run continuously, so notifications are sent instantly without delay.

D Serverless requires you to provision servers in advance for peak notification times.

💡 Hint

Consider how serverless billing works with irregular usage.

Serverless computing charges only for actual execution time, making it cost-effective for irregular, event-driven tasks like sending notifications.

Practice

1. What is the main advantage of serverless computing compared to traditional server management?

easy

A. You don't have to manage or maintain servers yourself.

B. You get unlimited free server usage.

C. You must buy physical servers for your code.

D. You need to install software on each server manually.

Solution

1. Step 1: Understand serverless computing basics

   Serverless computing means the cloud provider manages the servers, so you don't have to.

2. Step 2: Compare with traditional server management

   Traditional requires you to set up and maintain servers; serverless removes this burden.

3. Final Answer:

   You don't have to manage or maintain servers yourself. -> Option A

4. Quick Check:

   Serverless = No server management [OK]

Hint: Serverless means no server setup needed [OK]

Common Mistakes:

• Thinking serverless means free unlimited usage
• Confusing serverless with owning physical servers
• Assuming manual software installation is needed

2. Which of the following is the correct way to describe serverless computing?

easy

A. You run code on your own physical servers.

B. You pay only when your code runs, not for idle time.

C. You must configure the server's operating system manually.

D. You need to buy and maintain server hardware.

Solution

1. Step 1: Identify payment model in serverless

   Serverless charges you only when your code executes, not for idle server time.

2. Step 2: Eliminate incorrect options

   Options A, C, and D describe traditional server management, not serverless.

3. Final Answer:

   You pay only when your code runs, not for idle time. -> Option B

4. Quick Check:

   Serverless payment = pay per execution [OK]

Hint: Serverless billing is based on code execution time [OK]

Common Mistakes:

• Assuming you pay for server uptime even if code is idle
• Confusing serverless with owning physical servers
• Thinking manual OS setup is required

3. Consider this scenario: A serverless function is triggered by a user uploading a photo. What happens immediately after the upload?

medium

A. The serverless function runs automatically to process the photo.

B. The user must manually start the serverless function.

C. The serverless function waits until the server is manually started.

D. The photo upload fails because serverless can't handle files.

Solution

1. Step 1: Understand event-driven nature of serverless

   Serverless functions run automatically when triggered by events like file uploads.

2. Step 2: Analyze the scenario

   Uploading a photo triggers the function immediately without manual intervention.

3. Final Answer:

   The serverless function runs automatically to process the photo. -> Option A

4. Quick Check:

   Serverless = automatic event response [OK]

Hint: Serverless runs code automatically on events [OK]

Common Mistakes:

• Thinking user must start the function manually
• Assuming serverless can't handle file uploads
• Believing server must be manually started first

4. A developer wrote this serverless function code but it never runs when triggered. What is the most likely error?

medium

A. The serverless platform requires manual server start.

B. The function code has a syntax error.

C. The function is not linked to the event trigger.

D. The function runs only on physical servers.

Solution

1. Step 1: Check event trigger linkage

   Serverless functions must be connected to events to run automatically.

2. Step 2: Evaluate other options

   Syntax errors cause failures but usually error messages; manual server start is not needed; serverless does not run only on physical servers.

3. Final Answer:

   The function is not linked to the event trigger. -> Option C

4. Quick Check:

   Missing trigger linkage = no function run [OK]

Hint: Check event trigger connection if function doesn't run [OK]

Common Mistakes:

• Assuming manual server start is needed
• Ignoring event trigger setup
• Confusing serverless with physical server requirements

5. You want to build a photo-sharing app that automatically resizes images when users upload them. Which serverless feature best fits this need?

hard

A. Using physical servers to store photos only.

B. Manually starting servers to process images.

C. Paying for server uptime regardless of uploads.

D. Event-driven functions that run on each photo upload.

Solution

1. Step 1: Identify app requirement

   The app needs automatic image resizing triggered by uploads.

2. Step 2: Match with serverless features

   Event-driven functions run automatically on upload events, perfect for this task.

3. Step 3: Eliminate other options

   Manual server start and paying for uptime are not serverless advantages; physical servers only store, not process.

4. Final Answer:

   Event-driven functions that run on each photo upload. -> Option D

5. Quick Check:

   Event-driven serverless = automatic processing [OK]

Hint: Use event-driven functions for automatic tasks [OK]

Common Mistakes:

• Choosing manual server management
• Ignoring pay-per-use benefits
• Confusing storage with processing