VM sizes and series (B, D, E, F) in Azure - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Azure B-series VM burst behavior

Which statement best describes the behavior of Azure B-series VMs when they use their CPU credits?

A B-series VMs accumulate CPU credits when idle and use them to burst above the baseline CPU performance when needed.

B B-series VMs have fixed CPU performance and do not accumulate or use CPU credits.

C B-series VMs burst CPU performance only when connected to a premium storage account.

D B-series VMs automatically upgrade to D-series when CPU usage exceeds baseline.

💡 Hint

Think about how burstable VMs manage CPU usage over time.

B-series VMs accumulate CPU credits during low usage periods and use these credits to burst above their baseline CPU performance when demand increases.

❓ Architecture

intermediate

Choosing VM series for memory-intensive workloads

You need to deploy a virtual machine optimized for memory-intensive applications with a balanced CPU-to-memory ratio. Which Azure VM series is the best fit?

A E-series

B D-series

C B-series

D F-series

💡 Hint

Consider which series is designed for high memory capacity.

E-series VMs are optimized for memory-intensive workloads, offering a higher memory-to-CPU ratio compared to other series.

❓ service_behavior

advanced

Performance characteristics of Azure F-series VMs

What is the primary performance characteristic of Azure F-series VMs compared to D-series VMs?

A F-series VMs support burstable CPU credits like B-series.

B F-series VMs have more memory per CPU core than D-series.

C F-series VMs have a higher CPU-to-memory ratio, optimized for compute-intensive workloads.

D F-series VMs are optimized for GPU workloads.

💡 Hint

Think about which VM series is designed for compute power over memory.

F-series VMs provide a higher CPU-to-memory ratio than D-series, making them suitable for compute-intensive tasks.

❓ security

advanced

Security considerations for VM series with ephemeral OS disks

Which Azure VM series supports ephemeral OS disks by default, and what is a key security implication of using ephemeral OS disks?

A D-series; ephemeral OS disks improve security by encrypting data at rest automatically.

B B-series; ephemeral OS disks store data persistently across reboots for security auditing.

C F-series; ephemeral OS disks provide network isolation by default.

D E-series; ephemeral OS disks store OS data in local VM storage and data is lost on deallocation, requiring secure backup strategies.

💡 Hint

Consider which series supports ephemeral OS disks and what happens to data on VM stop/start.

E-series VMs support ephemeral OS disks that store OS data on local VM storage, which is lost when the VM is deallocated. This requires careful backup and security planning.

✅ Best Practice

expert

Optimizing cost and performance for variable workloads

You have a workload with low average CPU usage but occasional spikes. Which VM series and configuration best balances cost and performance?

A Use E-series VMs with premium storage to optimize CPU bursts.

B Use B-series VMs to accumulate CPU credits during low usage and burst during spikes.

C Use F-series VMs and scale out manually during spikes.

D Use D-series VMs with fixed high CPU allocation to handle spikes without bursting.

💡 Hint

Think about which VM series is designed for burstable workloads to save cost.

B-series VMs are designed for workloads with low average CPU usage and occasional bursts, allowing cost savings by using accumulated CPU credits.