Which three IP multicast related statements are true？ （Choose three.） （）
A. Multicast addresses 224.0.1.0 through 238.255.255.255 are called globally scoped addresses. They are used to multicast data between organizations and across the Internet
B. The multicast address 224.0.0.1 is a globally scoped address that has been reserved for the Network Time Protocol （NTP） by the IANA
C. Multicast addresses 239.0.0.0 through 239.255.255.255 are called limited scope addresses. They are constrained to a local group or organization
D. Multicast addresses 224.0.0.5 and 224.0.0.6 are limited scoped addresses that have been reserved for OSPF
E. Multicast addresses 224.0.0.0 through 224.0.0.255 are used for network protocols on local LANsegments. Because they are always transmitted with a Time to Live （TTL） of 1， they are never forwarded by a router
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班级管理目标设定管理思想依据是（）。
A. 为了组织的生存和发展
B. 为了学生的全面发展
C. 为了学校的发展
D. 为了教师集体的发展
Refer to the exhibit. Which statement is true about a voice VLAN？（）
A. Physically the voice network and the data network are separate.
B. The voice traffic will normally be on a different IP subnet than will the data traffic.
C. End user intervention is necessary to place the phone into the proper VLA
D. The same security policy should be implemented for both voice and data traffic.
E. The data VLAN must be configured as the native VLA
Given the following configuration： port-profile type ethernet DATA-UPLINK vmware port-group switchport trunk allowed vlan 1-3967，4048-4093 channel-group auto mode on no shutdown state enabled port-profile type ethernet MGMT-UPLINK vmware port-group switchport trunk allowed vlan 10-12 channel-group auto mode on no shutdown state enabled VEMs are seen to be joining and then are lost from the Cisco VSM. How would you resolve this issue？（）
A. Remove second NIC from each port profile
B. Remove VEM from VSM （no vem X）， remove NICs， and reinsert
C. Ensure that VLANs on uplink profiles are not overlapping
D. Reinstall VEM
E. Issue the command "module vem X execute vemcmd set pinning module vsm 1"
Which two statements are true about RPF checks in MSDP（Multicast Source Discovery Protocol）？（）
A. It prevents message looping，Session Advertisement（SA）messages must be RPF checked
B. RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SMdomain，which originated the SA
C. RPF checking Session Advertisement（SA）messages will cause message looping
D. RPF check should be done against the route to the source S of the corresponding PIM-SM domain
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