Cisco 400-051 Exam

Which statement describes a disadvantage of using the Cisco TFTP service to serve IP phone load files?

  • A. The Cisco TFTP services can run on only one Cisco Unified Communications Manager server in a cluster.
  • B. Because TFTP operates on top of UDP, there is a high risk of corrupted load file delivery at the completion of the TFTP process due to undetected data loss in the network.
  • C. If a response is not received in the timeout period, the TFTP server will not resend the data packet.
  • D. Packet loss can significantly increase the TFTP session completion time.
  • E. Because TFTP operates with an adaptive timeout period, the time to complete the file transfer is unpredictable.
Answer: Option D.
Explanation: 

Voice traffic cannot recapture lost packets. Rather than retransmitting a lost network connection, the phone resets and attempts to reconnect its network connection.
Reference: http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/6921_6941_6961/7_1_2/english/admin/guide/6921trb.html#wp1031181

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