Based on the Cisco Jabber client’s status, which of the following is most likely true?
A. The DNS server is down.
B. The UCM server is not configured to use DNS.
C. The UCM server’s host name is CCMCIP.
D. Joe Cambers’ user name is Jabberwocky.
Explanation:
Most likely, the Cisco Unified Communications Manager (UCM) server is not configured to use Domain Name System (DNS) name resolution. Based on the Cisco Jabberclient’s status, you can determine that the Jabber client is connected to UCM by using the IP address of 192.168.51.10. In addition, The Cisco UCM Administration page has been loaded in a web browser by using the IP address of 192.168.51.10.
Although UCMcan be deployed with a DNS configuration, Cisco recommends that administrators who are deploying UCM in a high availability environment not rely on DNS to connect endpoints to UCM, because doing so could create a single point of failure. Even if DNS is required for systems management purposes, Cisco recommends not using host names to configure endpoints, gateways, and UCM servers.
When Cisco Jabber cannot connect to a server by using either DNS or an IP address, the Cannot communicate with the servermessage will appear on the Cisco Jabber client’s login screen. The same message will appear if the server to which Cisco Jabber is configured to connect is down. In this scenario, the Cisco Jabber client has successfully connected to the UCM device at 192.168.51.10.
Joe Cambers’ user name is not Jabberwocky. In this scenario, the user’s login information has not been provided. Jabberwocky is the name of the Cisco Jabber client endpoint in UCM. In addition, there is not enough information to determine whether a DNS server is down, because the Cisco Jabber client is not relying on DNS to connect to the UCM server. If the Cisco Jabber user logged in with a fully qualified domain name (FQDN), you could surmise that the DNS server is still functional because Cisco Jabber was able to resolve the login credential. However, you do not know what credentials Joe Cambers used to log in.
The UCM server’s host name is not CCMCIP. The Cisco Unified Communications Manager IP Phone (CCMCIP) service is a UCM service that enables UCM to associate devices with end users.
Reference:
Cisco: Network Infrastructure: Domain Name System (DNS)