Which two statements about using the Load Server option for IP phone firmware distribution are true?

Which two statements about using the Load Server option for IP phone firmware distribution are
true? (Choose two.)

A.
This option must be enabled on at least two servers in a Cisco Unified Communications Manager
cluster.

B.
This option must be enabled on Cisco Unified Communications Manager service parameters for
Cisco TFTP.

C.
Phone firmware must be manually copied to any applicable load servers.

D.
The load server will not function if its IP address is not in the same subnet as the IP phones.

E.
This option is only available for newer IP phone models.

F.
This option does not accommodate falling back to Cisco TFTP on error.

Explanation:
Choosing the Right Distribution Method
Which of the three different image-distribution methods discussed so far is the best for a customer
deployment? Each method has advantages and disadvantages, and they are summarized in Table 1.
Table 1. Summary of Distribution Models
Peer Firmware
Sharing
Load Server Traditional TFTP
Advantages • 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
• Has same download
time as LAN image
distribution
• Distributes TFTP load
over multiple TFTP
servers
• Proven
distribution
• Default
behavior
Disadvantages • Must be
enabled on each
phone
• Hierarchy is
formed for each
phone model
• Hierarchy is
limited to subnet
• IP must be set on
each phone
• Administrator must
manually file copy to
load server
• No failback to TFTP
on error
• More prone to user
error
• Highbandwidth
requirements
• Multiple
requests for
same file
• High CPU
usage on TFTP
server

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6882/ps6884/white_paper_c11-
583891.pdf