Function pricing (consumption vs premium) in Azure - Practice Questions

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding billing triggers in Consumption plan

Which event causes billing to start for an Azure Function running on the Consumption plan?

A When the function code is executed in response to an event

B When the function app is deployed to Azure

C When the function app is idle for more than 5 minutes

D When the function app is scaled to multiple instances

💡 Hint

Think about what triggers actual work and resource use.

In the Consumption plan, billing starts only when the function runs in response to an event, not when deployed or idle.

❓ Architecture

intermediate

Scaling behavior difference between Consumption and Premium plans

Which statement correctly describes the scaling behavior difference between Azure Functions Consumption and Premium plans?

A Consumption plan scales instantly with no cold starts; Premium plan has fixed instances

B Consumption plan scales automatically with possible cold starts; Premium plan pre-warms instances to avoid cold starts

C Both plans require manual scaling and have cold starts

D Premium plan scales only during business hours; Consumption plan scales 24/7

💡 Hint

Consider how each plan handles instance readiness.

The Consumption plan scales automatically but may have cold starts. The Premium plan pre-warms instances to reduce cold starts.

❓ security

advanced

Network isolation capabilities in Function plans

Which Azure Function pricing plan supports Virtual Network (VNet) integration for secure network isolation?

A Neither plan supports VNet integration

B Both Consumption and Premium plans

C Consumption plan only

D Premium plan only

💡 Hint

Think about which plan offers advanced networking features.

Only the Premium plan supports VNet integration for secure network isolation.

✅ Best Practice

advanced

Choosing the right plan for predictable workloads

You have an Azure Function with a steady, predictable workload that requires no cold starts and needs to run 24/7. Which plan is best?

A Premium plan, because it pre-warms instances and supports always-on

B Consumption plan, because it is cost-effective for steady workloads

C Consumption plan, because it automatically scales to zero when idle

D Premium plan, because it charges only when functions run

💡 Hint

Consider the need for no cold starts and always-on availability.

The Premium plan supports pre-warmed instances and always-on, making it ideal for steady workloads without cold starts.

❓ service_behavior

expert

Memory allocation and billing differences

How does memory allocation affect billing in Azure Functions Consumption vs Premium plans?

A Both plans bill only per execution count, memory is not billed separately

B Consumption plan bills per GB-second with fixed 1.5 GB memory; Premium plan bills per instance regardless of memory

C Consumption plan bills per GB-second based on allocated memory; Premium plan allows custom memory sizes and bills per vCPU and memory allocated

D Premium plan bills per GB-second; Consumption plan bills per vCPU usage

💡 Hint

Think about how memory customization affects billing in each plan.

Consumption plan bills per GB-second based on allocated memory (default 1.5 GB). Premium plan allows custom memory and bills per vCPU and memory allocated.

Practice

1. Which Azure Function pricing plan charges you only when your function runs, making it ideal for infrequent tasks?

easy

A. Dedicated App Service plan

B. Consumption plan

C. Premium plan

D. Enterprise plan

Solution

1. Step 1: Understand pricing models

   The Consumption plan charges based on actual function executions, so you pay only when your code runs.

2. Step 2: Compare with other plans

   The Premium plan and Dedicated plans have fixed costs regardless of usage, making them less ideal for infrequent tasks.

3. Final Answer:

   Consumption plan -> Option B

4. Quick Check:

   Pay per use = Consumption plan [OK]

Hint: Pay only when running = Consumption plan [OK]

Common Mistakes:

• Confusing Premium plan with Consumption plan
• Thinking Dedicated plan charges per use
• Assuming Enterprise plan is standard for functions

2. Which of the following is the correct way to describe the Premium plan pricing for Azure Functions?

easy

A. Fixed cost plus charges based on usage

B. You pay only when the function runs, no fixed cost

C. Free for all usage levels

D. Charges based on number of users

Solution

1. Step 1: Identify Premium plan pricing

   The Premium plan has a fixed monthly cost plus additional charges based on how much you use it.

2. Step 2: Eliminate incorrect options

   Consumption plan is pay-per-use only, so You pay only when the function runs, no fixed cost is wrong. There is no free unlimited usage or user-based pricing.

3. Final Answer:

   Fixed cost plus charges based on usage -> Option A

4. Quick Check:

   Premium = fixed + usage cost [OK]

Hint: Premium = fixed cost plus usage charges [OK]

Common Mistakes:

• Confusing Premium with Consumption plan pricing
• Thinking Premium plan is free
• Assuming pricing depends on users

3. You have an Azure Function running on the Consumption plan that executes 1 million times a month. Which statement best describes your billing?

medium

A. You pay a fixed fee plus a small charge per execution.

B. You pay a fixed monthly fee regardless of executions.

C. You pay only for the 1 million executions plus resource usage.

D. You pay nothing because Consumption plan is free.

Solution

1. Step 1: Understand Consumption plan billing

   Consumption plan charges based on the number of executions and resource consumption, no fixed fee.

2. Step 2: Analyze options

   You pay a fixed monthly fee regardless of executions. and C mention fixed fees which do not apply to Consumption plan. You pay nothing because Consumption plan is free. is incorrect because Consumption plan is not free.

3. Final Answer:

   You pay only for the 1 million executions plus resource usage. -> Option C

4. Quick Check:

   Consumption = pay per execution [OK]

Hint: Consumption plan charges per execution only [OK]

Common Mistakes:

• Assuming fixed monthly fee on Consumption plan
• Thinking Consumption plan is free
• Mixing Premium plan billing with Consumption

4. You deployed an Azure Function on the Premium plan but noticed unexpectedly high costs. What is a likely cause?

medium

A. Premium plan has a fixed cost plus usage, so fixed cost adds even if usage is low.

B. Premium plan is free for the first 1 million executions, so costs should be zero.

C. You forgot to enable the Consumption plan, so you are charged double.

D. You are charged only when the function runs, so high usage caused high cost.

Solution

1. Step 1: Understand Premium plan cost structure

   Premium plan includes a fixed monthly cost plus charges based on usage.

2. Step 2: Identify cause of high costs

   Even if usage is low, the fixed cost applies, which can cause unexpectedly high bills.

3. Final Answer:

   Premium plan has a fixed cost plus usage, so fixed cost adds even if usage is low. -> Option A

4. Quick Check:

   Premium fixed cost causes base charges [OK]

Hint: Premium plan always has fixed cost component [OK]

Common Mistakes:

• Thinking Premium charges only on usage
• Confusing Consumption plan with Premium
• Assuming Premium plan is free for some executions

5. You expect your Azure Function to have steady, high traffic with occasional spikes. Which plan should you choose to optimize cost and performance?

hard

A. Free tier, because it handles high traffic without cost

B. Consumption plan, because it charges only when functions run

C. Dedicated App Service plan, because it has no scaling limits

D. Premium plan, because it offers pre-warmed instances and scales smoothly

Solution

1. Step 1: Analyze workload pattern

   Steady high traffic with spikes needs consistent performance and quick scaling.

2. Step 2: Match plan features

   Premium plan provides pre-warmed instances to avoid cold starts and scales smoothly, fitting this pattern well.

3. Step 3: Eliminate other options

   Consumption plan may have cold starts causing delays. Dedicated plan is costly and less flexible. Free tier cannot handle high traffic.

4. Final Answer:

   Premium plan, because it offers pre-warmed instances and scales smoothly -> Option D

5. Quick Check:

   Steady high traffic = Premium plan [OK]

Hint: Steady high traffic? Choose Premium for performance [OK]

Common Mistakes:

• Choosing Consumption plan despite cold start delays
• Assuming Dedicated plan is best for all cases
• Thinking Free tier supports high traffic