The correct answer is to use an MX record as the alternative DNS record type when TXT is not supported. This works because Microsoft 365’s domain verification system can parse the specific subdomain and priority value embedded in the MX record’s data, effectively carrying the same verification token that would normally reside in a TXT record. On the MS-102 exam, this scenario tests your understanding of DNS record fallback options during custom domain setup, often appearing as a troubleshooting question where the candidate must recall that MX records are universally supported by even the most restrictive DNS providers. A common trap is assuming an A or CNAME record can substitute, but only MX records are designed to hold the required verification string in their priority field. Memory tip: think “MX for Missing TXT” — when TXT is blocked, MX is your next best bet.
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 wants to verify ownership of a custom domain 'adatum.com' in their Microsoft 365 tenant. They have already added the domain and received the TXT record value. However, the administrator's DNS hosting provider does not support adding a TXT record. Which alternative record type can be used for domain verification?
Why wrong: Incorrect. A records are for IP addresses, not for verifying domain ownership.
B
MX record
Correct. Microsoft supports verification using a specific MX record with the value 'msXXXXXX.adatum.com' (where 'X' represents the verification token).
C
SRV record
Why wrong: Incorrect. SRV records are used for services like LDAP or SIP, not for domain verification in Microsoft 365.
D
NS record
Why wrong: Incorrect. NS records delegate a subdomain to another nameserver and are not accepted for verification.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
MX record
When a DNS hosting provider does not support TXT records, Microsoft 365 allows the use of an MX record as an alternative for domain verification. The administrator creates an MX record with a specific subdomain (e.g., 'adatum-com.mail.protection.outlook.com') and a custom priority value provided in the TXT record value, which Microsoft's verification system checks to confirm domain ownership. This method is supported because MX records are widely available and can carry the necessary verification data in their format.
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.
✗
record
Why it's wrong here
Incorrect. A records are for IP addresses, not for verifying domain ownership.
✓
MX record
Why this is correct
Correct. Microsoft supports verification using a specific MX record with the value 'msXXXXXX.adatum.com' (where 'X' represents the verification token).
Related concept
Read the scenario before looking for a memorised answer.
✗
SRV record
Why it's wrong here
Incorrect. SRV records are used for services like LDAP or SIP, not for domain verification in Microsoft 365.
✗
NS record
Why it's wrong here
Incorrect. NS records delegate a subdomain to another nameserver and are not accepted for verification.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume only TXT records can verify domain ownership, overlooking that Microsoft 365 explicitly supports MX records as an alternative when TXT records are unavailable, which is a common scenario in restrictive DNS environments.
Detailed technical explanation
How to think about this question
Microsoft 365 domain verification relies on DNS records to prove control over the domain; the TXT record is the primary method, but MX records can be used as a fallback because they are mandatory for mail flow and thus universally supported. The verification process involves creating an MX record with a unique priority value (e.g., 0) and a specific hostname that includes the verification token, which Microsoft's DNS lookup checks against the expected value. This approach is defined in Microsoft's domain verification documentation and leverages the fact that MX records are less likely to be blocked or unsupported by hosting providers.
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: MX record — When a DNS hosting provider does not support TXT records, Microsoft 365 allows the use of an MX record as an alternative for domain verification. The administrator creates an MX record with a specific subdomain (e.g., 'adatum-com.mail.protection.outlook.com') and a custom priority value provided in the TXT record value, which Microsoft's verification system checks to confirm domain ownership. This method is supported because MX records are widely available and can carry the necessary verification data in their format.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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