Which two statements about the Peer Firmware Sharing option for IP phone firmware distribution are true? (Choose two.)
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A. B. C. D. E. F.CF.
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.
The Peer Firmware Sharing option is a feature in Cisco Unified Communications Manager that allows IP phone firmware distribution within a cluster. It uses a parent-child hierarchy, where a firmware image is downloaded by a parent phone and then shared with up to three directly associated child phones. Here are the two true statements about this option:
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. This statement is true. Peer Firmware Sharing allows a firmware image to be downloaded by a parent phone and then shared with up to three directly associated child phones. This reduces the amount of bandwidth used for firmware distribution and improves the distribution time.
B. This option must be enabled on Cisco Unified Communications Manager service parameters for Cisco TFTP. This statement is also true. The Peer Firmware Sharing option must be enabled on Cisco Unified Communications Manager service parameters for Cisco TFTP. This enables the TFTP server to provide firmware images to phones that request them.
The other statements are false: C. This option mandates that the parent phone and child phones be identical, selected phone models. This statement is false. The Peer Firmware Sharing option allows different phone models to share firmware images as long as they support the same firmware version.
D. This option allows firmware transfers between phones in different subnets, as long as the round-trip delay is less than 5 milliseconds. This statement is false. Firmware transfers using Peer Firmware Sharing are limited to phones in the same subnet as the parent phone.
E. This option uses a parent-child hierarchy that must be manually defined by the Cisco Unified Communications Manager administrator. This statement is false. The parent-child hierarchy in Peer Firmware Sharing is automatically created based on the phone registration process.
F. This option allows falling back to the TFTP server in the Cisco Unified Communications Manager cluster. This statement is false. Peer Firmware Sharing does not allow falling back to the TFTP server in the Cisco Unified Communications Manager cluster. If a firmware image is not available from the parent phone or the local cache, the phone will not be able to upgrade its firmware.