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. 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.
An administrator needs to add a custom domain 'contoso.org' to their Microsoft 365 tenant. They have already purchased the domain and have access to the DNS registrar. What is the first step the administrator should perform in the Microsoft 365 admin center?
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 domain in the Microsoft 365 admin center
The first step to add a custom domain to a Microsoft 365 tenant is to initiate the domain addition process in the Microsoft 365 admin center. This triggers Microsoft to generate the unique verification TXT record that must be published in the public DNS zone. Without first adding the domain in the admin center, the administrator would not know the specific verification string required for the TXT record.
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.
✗
Add a TXT record in the public DNS zone
Why it's wrong here
Adding the DNS record is the verification step, but it must follow adding the domain in the admin center.
✓
Add the domain in the Microsoft 365 admin center
Why this is correct
The domain must be added to the tenant first. Then the admin center provides the verification DNS records.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure email routing (MX record)
Why it's wrong here
Email routing is configured after the domain is verified.
✗
Create user accounts with the new domain
Why it's wrong here
User accounts can only be created after the domain is added and verified.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the sequence of steps and think that adding a DNS record (like TXT or MX) is the first action, when in reality the domain must first be registered in the admin center to obtain the required verification token.
Detailed technical explanation
How to think about this question
The domain verification process uses the Domain Name System (DNS) TXT record with a specific GUID generated by Microsoft. This GUID is unique per domain per tenant and is used to prove ownership via a challenge-response mechanism defined in RFC 8552. Once the TXT record is published and verified, the domain's SOA and NS records are checked to ensure the domain is routable, after which services like Exchange Online and SharePoint can be provisioned.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 domain in the Microsoft 365 admin center — The first step to add a custom domain to a Microsoft 365 tenant is to initiate the domain addition process in the Microsoft 365 admin center. This triggers Microsoft to generate the unique verification TXT record that must be published in the public DNS zone. Without first adding the domain in the admin center, the administrator would not know the specific verification string required for the TXT record.
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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