Which TFTP server address selection option has the highest precedence on Cisco SCCP IP phones using firmware release 8.0(4) or later?
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A. B. C. D. E.A.
References:
On Cisco SCCP IP phones using firmware release 8.0(4) or later, the TFTP server address selection option with the highest precedence is the manually configured alternate TFTP option on the phone.
Explanation:
When a Cisco SCCP IP phone boots up, it looks for a TFTP server to download its firmware and configuration files. The phone can receive the TFTP server address through various methods, including DHCP, manual configuration, or via the boot-up process.
In the case of DHCP, the phone can receive the TFTP server address via Option 66 or Option 150. Option 66 provides the dotted decimal IP address of the TFTP server, while Option 150 provides the TFTP server's hostname or IP address in the form of a list. If both Option 66 and Option 150 are present, the phone will use the Option 66 address by default.
The value of next-server IP address in the boot-up process is also a possible option for the phone to receive the TFTP server address.
However, if an alternate TFTP server address is manually configured on the phone, it takes precedence over all other options. This means that if the phone has an alternate TFTP server configured, it will always use that address to download its firmware and configuration files.
Therefore, option A is the correct answer: a manually configured alternate TFTP option on the phone has the highest precedence on Cisco SCCP IP phones using firmware release 8.0(4) or later.