You are the Microsoft Lync administrator for a company that uses Lync Online.
The company has mandated that employees may use Lync Online to communicate with contacts from
approved external domains.
You need to configure Lync Online to allow Lync federation with only three specific domains. You must achieve
this goal by using the least amount of administrative effort.
Which two actions should you perform? Each correct answer presents part of the solution.

A.
In the Lync admin center, set the External Access option to On except for blocked domains.

B.
In the Office 365 admin center, add the three domains to the domain list and set the domain intent for each
domain to Lync Online.

C.
In the Lync admin center, set the External Access option to Off completely.

D.
In the Lync admin center, set the External Access option to On only for allowed domains.

E.
In the Lync admin center, configure the Presence Privacy Mode option to display presence information only
to the users’ contacts.

F.
In the Lync admin center, add the three domains to the Blocked Or Allowed Domains list.

Explanation:
We need to allow Lync federation with only three specific domains to enable Lync communications with those
domains.
In the Lync Online admin center, you can configure options for external communications. You have three
options. The default option is turned off completely; no external communications. To enable externalcommunications, you can block specific domains but allow all other domains or as in this question, we can
allow only specific domains by selecting the “On only for allowed domains”.
With this option selected, we need to list the domains that are allowed. We need to add the three domains to
the Blocked Or Allowed Domains list and select the ‘Allowed’ option for each domain.