An update of the configuration using the Cisco CTL client not needed when _______.(SourcE.
Configuring Cisco IP Telephony Authentication and Encryption)

A.
a Cisco Unified CallManager has been removed

B.
an LSC of the IP phone is upgraded

C.
a security token is added to the system

D.
an IP address of the Cisco TFTP server has been changed

Explanation:
The CTL file contains entries for the following servers or security tokens:
• System Administrator Security Token (SAST)
• Cisco CallManager and Cisco TFTP services that are running on the same server
• Certificate Authority Proxy Function (CAPF)
• TFTP server(s)

• ASA firewall
Link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/8_6_1/secugd/secuauth.html#w
p1028878