Microsoft 365 Custom Domains

Question 1

Split brain DNS

Answer 1

Split brain DNS is a configuration in which the internal and external DNS environments provide different IP addresses to requests for the same host name. The address provided depends on which server is used for name resolution.

Question 3

External DNS records required for email in Microsoft 365 (Exchange Online)

Answer 3

Autodiscover. This record allows client computers to automatically find Exchange and configure the client properly.

MX. This record tells other mail systems where to send email for the company’s domain.

Sender policy framework (SPF).

Question 4

Step 1 Add TXT record to verify you own the domain

Answer 4

Sign in to the Microsoft 365 admin center. In the left-hand navigation pane, select Show all, then select Settings, and then select Domains.

Go to your provider’s DNS Manager page and add the TXT record indicated in the admin center to your domain.

Question 5

Step 2 Add DNS records to connect Microsoft services

Answer 5

Add an MX record for email (Outlook, Exchange Online)

Add CNAME records to connect other services (Teams, Exchange Online, MDM)

Add SRV records for communications services (Teams, Skype for Business)

Question 6

Outlook and other Office-related clients can use which of the following features to automatically locate services in Microsoft 365?

Answer 6

Autodiscover automatically configures Outlook to connect to Exchange Online. It does so without the need to manually configure user connection settings.