70
Cisco 642-447 Exam
Which two of these are characteristics of multicast music on hold? (Choose two.)

A.
It uses one-way RTP point-to-point.

B.
There is a single user per audio stream.

C.
Networks and devices have to support multicast.

D.
It decrements by port number for different audio sources.

E.
It uses the multicast group address 238.1.1.1 to 239.255.255.255.

F.
It uses the multicast group address 239.1.1.1 to 239.255.255.255.

G.
It uses service parameters to set the codec type or types that are used by conferencing services

Explanation:
Incorrect answe : ABDEG
Explanation : In multicast scenario A& B is absolutely wrong. Cisco recommends using an IP address in the range that is reserved for administratively controlled applications on private networks (239.0.0.0 to 239.255.255.255)
Link : http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_5_1/ccmfeat/fsmoh.html Note: if this would have been a choose three question then G could be correct as well. Reference : Cisco Unified Communications Manager Features and Services Guide for Cisco Unified communications Manager Release 8.5(1), page-1002