You administer Microsoft Lync Server 2013 clients and servers in your customer’s network. All client
computers run Windows 8 Enterprise and Microsoft Lync 2013. The computers are members of an
Active Directory Domain Services (AD DS) domain named contoso.com. A user installs the Lync
Windows Store App on his computer. He reports that he is unable to sign in to the Lync Windows
Store App. The same user can successfully sign in by using Lync 2013. You need to diagnose the
reason for the failure. What should you do?
A.
Run nslookup against an external DNS server.
B.
Flush the DNS cache on the client computer.
C.
Run nslookup against the internal DNS server.
D.
Open a Telnet session to the Lync server.