Which two descriptions of TFTP option 66 and 150 for Cisco IP phones are true? (Choose two.)
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A. B. C. D. E. F.CE.
TFTP (Trivial File Transfer Protocol) is a protocol used to transfer files between network devices, often used for transferring firmware and configuration files for Cisco IP phones. TFTP server IP address or hostname is required to configure IP phones with the correct firmware and configuration files. In some cases, DHCP (Dynamic Host Configuration Protocol) can be used to provide IP phones with the TFTP server information.
DHCP option 66 and option 150 are used to provide IP phones with the TFTP server information. Option 66 specifies the TFTP server's hostname or IP address, while option 150 specifies only the TFTP server's IP address.
Let's discuss the statements in the question:
A. Option 150 supports multiple entries of TFTP server IP addresses, but option 66 supports only one of TFTP server DNS names.
Option 150 is used to specify the IP address of the TFTP server. It can support multiple entries of TFTP server IP addresses, but only one TFTP server can be active at a time. In contrast, option 66 specifies the hostname or IP address of the TFTP server, but it only supports one entry. Therefore, this statement is incorrect.
B. Option 150 supports only TFTP server IP addresses, but option 66 supports only TFTP server DNS names.
Option 150 only supports TFTP server IP addresses, while option 66 supports only TFTP server DNS names. This statement is incorrect.
C. Option 150 supports multiple entries of TFTP server IP addresses, but option 66 supports only one entry of either TFTP server IP address or DNS name.
Option 150 supports multiple entries of TFTP server IP addresses, but option 66 only supports one entry of either TFTP server IP address or DNS name. Therefore, this statement is correct.
D. Option 66 is Cisco proprietary, but option 150 is standard-based.
Option 66 is a standard-based option used by DHCP to provide IP phones with TFTP server information. Option 150 is a Cisco proprietary option, used to specify the TFTP server IP address. Therefore, this statement is incorrect.
E. Option 150 is Cisco proprietary, but option 66 is standard-based.
This statement is incorrect as mentioned earlier.
F. Option 150 and 66 are standard-based.
Option 66 is a standard-based option, while option 150 is a Cisco proprietary option. Therefore, this statement is incorrect.
To sum up, options C and D are the correct statements about TFTP option 66 and 150 for Cisco IP phones.