Under which three conditions will a Cisco 9971 IP Phone request the "xmldefault.cnf.xml" file from a TFTP server in a Cisco Unified CM cluster? (Choose three)
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A. B. C. D. E. F.BDF.
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The Cisco 9971 IP Phone is a model of IP phone that is commonly used in Cisco Unified Communications Manager (CUCM) clusters. When this phone is configured to operate in a CUCM cluster, it will request certain configuration files from a TFTP server in order to operate properly. One of these configuration files is the "xmldefault.cnf.xml" file.
There are three conditions under which the Cisco 9971 IP Phone will request the "xmldefault.cnf.xml" file from a TFTP server in a CUCM cluster. These conditions are:
A. The phone is registered to the CUCM cluster but needs to update its firmware. If the firmware on the Cisco 9971 IP Phone is outdated or needs to be updated, the phone will request the "xmldefault.cnf.xml" file from the TFTP server in order to download and apply the new firmware. This ensures that the phone is running the latest software version that is compatible with the CUCM cluster.
B. The phone is attempting to register to the CUCM cluster for the first time. When a new Cisco 9971 IP Phone is connected to the network and attempts to register with the CUCM cluster for the first time, it will request the "xmldefault.cnf.xml" file from the TFTP server. This file contains the default configuration settings for the phone, which are necessary for the phone to successfully register with the CUCM cluster.
F. Auto-registration is enabled on the CUCM cluster. If auto-registration is enabled on the CUCM cluster, any new Cisco 9971 IP Phones that are connected to the network will automatically register with the CUCM cluster. When this happens, the phones will request the "xmldefault.cnf.xml" file from the TFTP server in order to download their default configuration settings.
Note that the other answer choices are not correct for the following reasons:
C. Auto-registration is disabled on the CUCM cluster. If auto-registration is disabled on the CUCM cluster, new phones cannot automatically register with the cluster, so this condition would not apply.
D. The phone has not yet been defined in the CUCM database. If a phone has not yet been defined in the CUCM database, it cannot register with the CUCM cluster, so this condition would not apply.
E. The phone is attempting to change from SIP firmware to SCCP firmware. If the phone is attempting to change from SIP firmware to SCCP firmware, it will not request the "xmldefault.cnf.xml" file from the TFTP server. Instead, it will request different firmware files that are specific to the SCCP protocol.