Cisco 400-051 Exam

Which two statements about the Peer Firmware Sharing option for IP phone firmware distribution are true? (Choose two.)

  • A. This option uses a parent-child hierarchy in which a firmware image is downloaded by a parent phone to up to three directly associated child phones.
  • B. This option must be enabled on Cisco Unified Communications Manager service parameters for Cisco TFTP.
  • C. This option mandates that the parent phone and child phones be identical, selected phone models.
  • D. This option allows firmware transfers between phones in different subnets, as long as the round-trip delay is less than 5 milliseconds.
  • E. This option uses a parent-child hierarchy that must be manually defined by the Cisco Unified Communications Manager administrator.
  • F. This option allows falling back to the TFTP server in the Cisco Unified Communications Manager cluster.
Answer: Option C. F.
Explanation: 

Peer Firmware Sharing works by setting up a parent-child hierarchy of the phones in which a firmware image is downloaded by the parent phone to a child phone. The advantage of using Peer Firmware Sharing is that instead of all phones individually retrieving a software image, they pass the image along from one phone to another phone on the same subnet.
Advantage of PFS:
Hierarchy is automatic
One download per phone model on a subnet
Uses TCP
Fails back to TFTP
Speeds up LAN upgrades
Reduces TFTP CPU load during upgrade

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