- A
VMs are terminated and restarted automatically on new hardware, causing a few minutes of downtime.
Why wrong: VMs are not terminated during live migration. They are transparently moved to the new host while still running, with imperceptible pause time.
- B
Live migration transparently moves VMs to healthy hosts during maintenance with no VM downtime.
Compute Engine's live migration moves running VMs between physical hosts during maintenance events. The VM continues running — there's no stop/start cycle and no application downtime.
- C
VMs are snapshotted, the snapshot is restored on new hardware, and the VM is restarted.
Why wrong: Live migration is a hot migration of the VM's running state, not a snapshot/restore operation. Snapshots would cause significant downtime.
- D
Customers must subscribe to Google Cloud support to receive advance notice and schedule their own maintenance windows.
Why wrong: Live migration is automatic and available to all Compute Engine customers — no support subscription required. Google handles maintenance transparently.
How Google Cloud Live Migration Handles Host Maintenance
This GCDL practice question tests your understanding of scaling with google cloud operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has deployed a critical application on Google Cloud and wants to understand what happens to their workloads during a Google Cloud data center maintenance event (e.g., host system upgrades). What Google Compute Engine feature handles this automatically for most VMs?
Quick Answer
The answer is Google Compute Engine’s Live Migration, which automatically handles VM maintenance during host system upgrades. This feature works by transparently moving a running virtual machine from a host undergoing maintenance to a healthy host, preserving the VM’s memory, network connections, and disk state with zero downtime. For the Google Cloud Digital Leader exam, this concept tests your understanding of how Google Cloud ensures high availability for critical workloads without requiring manual intervention. A common trap is assuming that all VMs are eligible—remember that instances with GPUs or certain machine types opt out, so Live Migration applies to most, but not all, VMs. Memory tip: think “Live Migration = zero downtime, no heavy lifting.”
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Live migration transparently moves VMs to healthy hosts during maintenance with no VM downtime.
Google Compute Engine uses Live Migration to automatically move running VMs from a host undergoing maintenance (e.g., host system upgrades) to a healthy host without interrupting the VM. This process preserves the VM's memory, network connections, and disk state, resulting in zero VM downtime. It is enabled by default for most VM instances, except those with GPUs or certain machine types that explicitly opt out.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VMs are terminated and restarted automatically on new hardware, causing a few minutes of downtime.
Why it's wrong here
VMs are not terminated during live migration. They are transparently moved to the new host while still running, with imperceptible pause time.
- ✓
Live migration transparently moves VMs to healthy hosts during maintenance with no VM downtime.
Why this is correct
Compute Engine's live migration moves running VMs between physical hosts during maintenance events. The VM continues running — there's no stop/start cycle and no application downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
VMs are snapshotted, the snapshot is restored on new hardware, and the VM is restarted.
Why it's wrong here
Live migration is a hot migration of the VM's running state, not a snapshot/restore operation. Snapshots would cause significant downtime.
- ✗
Customers must subscribe to Google Cloud support to receive advance notice and schedule their own maintenance windows.
Why it's wrong here
Live migration is automatic and available to all Compute Engine customers — no support subscription required. Google handles maintenance transparently.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Live Migration with a restart or snapshot-based recovery, assuming maintenance always causes downtime, when in fact Google's Live Migration provides seamless, zero-downtime maintenance for the vast majority of VM instances.
Detailed technical explanation
How to think about this question
Live Migration works by iteratively copying the VM's memory pages from the source host to the destination host while the VM continues to run, then briefly pauses execution (typically under a second) to transfer the final dirty pages and CPU state, resuming on the new host. This process relies on the Google Compute Engine hypervisor and the underlying networking fabric (Andromeda) to maintain the VM's IP address, MAC address, and persistent disk attachments. In practice, for most workloads, the migration is transparent, but latency-sensitive applications (e.g., real-time streaming) may notice a microsecond-level pause.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this GCDL question test?
Scaling with Google Cloud operations — This question tests Scaling with Google Cloud operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Live migration transparently moves VMs to healthy hosts during maintenance with no VM downtime. — Google Compute Engine uses Live Migration to automatically move running VMs from a host undergoing maintenance (e.g., host system upgrades) to a healthy host without interrupting the VM. This process preserves the VM's memory, network connections, and disk state, resulting in zero VM downtime. It is enabled by default for most VM instances, except those with GPUs or certain machine types that explicitly opt out.
What should I do if I get this GCDL question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This GCDL practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the GCDL exam.
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