You support a customer whose network environment includes Microsoft Lync Server 2013 Enterprise, with two Front End Servers and two Back End Servers. The Back End Servers are deployed in a high availability configuration.
You create a Front End pool named pool.contoso.com and implement DNS load balancing for client access to the Lync servers.
Your internal DNS records have the following configuration:
Your Lync 2013 clients fail to sign in automatically. The trace log of failed sign-in attempt is as follows:
A. Create the following host records: Pool A 192.168.1.10 Pool A 192.168.1.11
B. Create the following host records: Sip A 192.162.1.20 Sip A 192.163.1.21
C. Create the following service record: _sip._tls.concoso.com SRVPriority 0, weight 0, port 5061, pooIOl.coato30.com
D. Create the following host records: Pool A 192.168.1.20 Pool A 192.168.1.21
E. Create the following service record:_sipinternal.tls.contoso.com SRVPriority 0, weight 0, port 5061, FrontEndServer1.contoso.com
