The answer is that the management network is isolated and HA isolation response is not configured. This is correct because vSphere HA agents rely on the management network to elect a master host and maintain heartbeat communication; when a host cannot reach the master, it enters an isolated state, and without a configured isolation response, it will not restart VMs. On the VCP-DCV exam, this scenario tests your understanding of HA architecture, specifically that the management network is the primary heartbeat path, not vCenter or datastore heartbeats, which are secondary. A common trap is assuming vCenter downtime breaks HA—it does not, as HA agents operate independently. Remember the memory tip: “No master? Check the management network first—isolation response is the key.”
VCP-DCV vSphere Architecture, Products and Solutions Practice Question
This VCP-DCV practice question tests your understanding of vsphere architecture, products and solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 a vSphere cluster with vSphere HA enabled. During a host failure, virtual machines on the failed host do not restart. The administrator checks the HA agent log and sees the error message: 'HA agent on host <hostname> has no master detected'. Which of the following is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The management network is isolated and HA isolation response is not configured
Option A is correct because the HA agents communicate via the management network; if isolation is not properly configured, a host may not detect a master. Option B is incorrect because vCenter Server being offline does not directly affect HA agent communication. Option C is incorrect because datastore heartbeats are secondary. Option D is incorrect because VDS health check is unrelated.
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.
✗
Datastore heartbeats are failing on the failed host
Why it's wrong here
Datastore heartbeats are used for node failure detection, not master election.
✓
The management network is isolated and HA isolation response is not configured
Why this is correct
HA agents rely on management network for master election; isolation prevents master detection.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
vCenter Server service is stopped
Why it's wrong here
vCenter Server is not required for HA master detection after initial configuration.
✗
The VDS uplink failure detection policy is set to 'Link Status only'
Why it's wrong here
This affects network failover, not HA master detection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
A practitioner preparing for the VCP-DCV exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which VCP-DCV exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
vSphere Architecture, Products and Solutions — This question tests vSphere Architecture, Products and Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The management network is isolated and HA isolation response is not configured — Option A is correct because the HA agents communicate via the management network; if isolation is not properly configured, a host may not detect a master. Option B is incorrect because vCenter Server being offline does not directly affect HA agent communication. Option C is incorrect because datastore heartbeats are secondary. Option D is incorrect because VDS health check is unrelated.
What should I do if I get this VCP-DCV question wrong?
Identify which VCP-DCV exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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