100-890 Phone Practice Questions
The free 100-890: Supporting Cisco Collaboration Devices questions that deal with phone, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #6
The Certificate Trust List (CTL) file is an important file that the Cisco IP phone downloads during the bootup process What information is defined in the CTL file?
Correct answer: C
Explanation
The CTL lists the trusted Unified CM and TFTP servers, with their certificates, that the phone is authorized to connect to, preventing rogue servers from serving the phone.
Question #8
From which network service does a Cisco IP phone request the configuration file during the bootup process?
Correct answer: E
Explanation
After DHCP supplies the TFTP server address (option 150), the phone requests its configuration file from the TFTP server, which tells it which Unified CM to register with.
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