MS-100 Microsoft 365 Tenant & Service Management 3

Question 1

Which DNS record type is required to route inbound email to Exchange Online for a custom domain?

Accepted Answer

MX record

Answer

TXT record

Answer

SPF record

Answer

DKIM CNAME record

Question 2

What is the primary prerequisite for adding a custom domain to a Microsoft 365 tenant?

Accepted Answer

You must own the domain and have access to modify its DNS settings

Answer

The domain must already have an MX record pointing to Microsoft servers

Answer

The domain must be registered through a Microsoft-approved registrar

Answer

A minimum of 25 Microsoft 365 licenses must be active

Question 3

What is the purpose of the Autodiscover CNAME record in a Microsoft 365 DNS configuration?

Accepted Answer

To allow email clients to automatically discover and configure their connection settings

Answer

To route inbound email to Exchange Online Protection

Answer

To verify domain ownership during tenant setup

Answer

To enable DKIM signing for outbound email messages

Question 4

In Microsoft 365 terminology, what is a 'vanity domain'?

Accepted Answer

A custom domain added to replace .onmicrosoft.com in user email addresses

Answer

A domain used exclusively for internal testing and development

Answer

A secondary domain reserved only for administrator accounts

Answer

An expired domain retained for URL redirect purposes

Question 5

When planning an Exchange migration to Exchange Online, what is the recommended approach for selecting the migration method?

Accepted Answer

Assess size, complexity, and timeline to choose cutover, staged, or hybrid migration

Answer

Always perform a cutover migration regardless of organization size

Answer

Always use a certified third-party migration tool

Answer

Migrate all mailboxes simultaneously during a single maintenance window

Question 6

What is the primary function of the Microsoft Purview compliance portal (formerly Microsoft 365 Compliance Center)?

Accepted Answer

To configure and manage compliance features such as eDiscovery, retention policies, and DLP

Answer

To manage user licenses and subscription renewals

Answer

To monitor Microsoft 365 service health and performance metrics

Answer

To manage Azure AD identity and access settings

Question 7

Which Microsoft 365 admin center feature allows administrators to configure organization-wide settings such as the organization name, technical contact, and release preferences?

Accepted Answer

Org settings under Settings

Answer

Service Health dashboard

Answer

Message Center preferences

Answer

Azure AD tenant properties only