350-801 CLCOR: Implementing and Operating Cisco Collaboration Core TechnologiesDemo

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QuestionQ148

Protocols and Endpoints

During Cisco IP Phone registration, the TFTP download fails. Which two conditions can cause this issue?

Choose two
  • A Option 100 string was not specified, or an incorrect Option 100 string was specified
  • B The Cisco IP Phone does not know the IP address of any of the Cisco UCM Subscriber nodes
  • C The Cisco IP Phone does not know the IP address of the TFTP server
  • D Option 150 string was not specified, or an incorrect Option 150 string was specified
  • E The DNS server was not specified, which is needed to resolve the DHCP server IP address
Explanation

Cisco IP Phones need the TFTP server IP address to download their configuration. DHCP option 150 provides the address or addresses of TFTP servers; therefore, an absent or incorrect option 150 value prevents a phone from locating the proper TFTP server. A phone that does not know the TFTP server IP address likewise cannot perform the download. Cisco Unified Communications Manager documentation

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