MS-102 Deploy and manage a Microsoft 365 tenant Practice Question
This MS-102 practice question tests your understanding of deploy and manage a microsoft 365 tenant. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Contoso recently acquired a company with an existing Microsoft 365 tenant. You need to migrate their user accounts and mailboxes to the Contoso tenant. The acquired company uses a custom domain for email. You must ensure minimal disruption and maintain email flow during migration. What should you do first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add the custom domain to the Contoso tenant and verify ownership.
Before any migration can proceed, the custom domain used by the acquired company must be added and verified in the Contoso tenant. This is a prerequisite for cross-tenant mailbox migrations because the target domain must be recognized and owned by the destination tenant to route email correctly and assign user principal names (UPNs). Without domain verification, migration tools cannot validate the domain and email flow will fail.
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.
✗
Perform a cross-tenant mailbox migration using Microsoft 365 migration tools.
Why it's wrong here
Incorrect: Migration tools require the domain to be verified first.
✗
Disable the acquired company's tenant to force all users to the Contoso tenant.
Why it's wrong here
Incorrect: This would break email and access immediately.
✗
Create new user accounts in the Contoso tenant using the onmicrosoft.com domain.
Why it's wrong here
Incorrect: Users need their original email domain to minimize disruption.
✓
Add the custom domain to the Contoso tenant and verify ownership.
Why this is correct
Correct: Domain verification is the first step to enable user creation and email routing.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often jump to selecting the migration tool (Option A) without realizing that domain verification is a prerequisite step that must be completed first, even before initiating any migration process.
Detailed technical explanation
How to think about this question
Domain verification in Microsoft 365 involves adding a TXT or MX record to the domain's DNS zone, which Microsoft checks to confirm ownership. This process is defined in RFC 1035 for DNS and is a mandatory step before the domain can be used for UPNs, email routing, or as a target for cross-tenant migrations. In a real-world scenario, if the custom domain is federated (e.g., with Active Directory Federation Services), additional steps like removing federation may be needed before verification.
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
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Deploy and manage a Microsoft 365 tenant — This question tests Deploy and manage a Microsoft 365 tenant — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add the custom domain to the Contoso tenant and verify ownership. — Before any migration can proceed, the custom domain used by the acquired company must be added and verified in the Contoso tenant. This is a prerequisite for cross-tenant mailbox migrations because the target domain must be recognized and owned by the destination tenant to route email correctly and assign user principal names (UPNs). Without domain verification, migration tools cannot validate the domain and email flow will fail.
What should I do if I get this MS-102 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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