Which two multicast address ranges are assigned as source-specific multicast destination addresses and are reserved for use by source-specific applications and protocols？（）

A .  Fa7/28 B .  Fa7/20 C .  Gi3/7 D .  Fa4/2 E .  Fa4/14 F .  Fa4/38 G .  Fa6/28 H .  Fa5/7

A . Fa6/28 B . Fa7/20 C . Gi3/7 D . Fa4/2 E . Fa4/14 F . Fa4/38 G . Fa6/38 H . Fa5/7

A . It is used for PIM control traffic B . It is optionally configured for a high bandwidth multicast source to reduce multicast traffic replication to uninterested PE routers C . Within the VPF configuration in the PE router， multiple Default MDT groups are configured so each VPF can support multiple multicast sources D . There is a reduced multicast state in the MPLS core P routers E . When multicast traffic exceeds a certain configured threshold， traffic from the Data MDT is switched to the Default MDT to conserve bandwidth

A . ASM B . BiDirPIM C . PIM-SMRP D . RP-Switchover E . SourceSpecificMulticast

A . only the low-order 23 bits of the MAC address are used to map IP addresses B . only the low-order 24 bits of the MAC address are used to map IP addresses C . only the high-order 23 bits of the MAC address are used to map IP addresses D . only the low-order 23 bits of the IP address are used to map MAC addresses E . the 0x01004f MAC address prefix is used for mapping IP addresses to MAC addresses F . the 0x01005e MAC address prefix is used for mapping IP addresses to MAC addresse

A . 6to4 B . 6over4 C . ISATAP D . 6PE E . GRE

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-SM domain，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 domai

A . ip pim rp-address B . ip pim ssm C . ip pim sparse-mode D . ip pim passive

A . 6to4 B . 6over4 C . ISATAP D . 6PE E . GRE

A .  224.21.106.44 B .  224.25.106.44 C .  233.149.106.44 D .  236.25.106.44 E .  239.153.106.44

A .  3600 series B .  7200 series with NSE-1 C .  7500 series D .  12000 serie

A .  Dense mode multicast requires explicit join messages from their members. B .  Dense mode multicast uses a push model to flood traffic throughout the network and then prunes the  unwanted traffic. C .  Sparse mode multicast uses a pull model to send multicast traffic to where it is requested.   D .  Sparse mode uses reverse path forwarding （RPF） to prune off redundant flows. E .  The primary use of sparse mode multicast is for test labs and router performance testing.

A . 228.10.10.7 B . 229.11.10.7 C . 229.138.10.7 D . 229.138.10.8 E . 228.10.10.8 F . 228.10.138.7

A . 232.0.0.0/8 B . 239.0.0.0/8 C . 232.0.0.0/4 D . FF3x：：/32 E . FF2x：：/32 F . FF3x：：/16

A . The multicast sources must register with the RP to form the multicast distribution tree. B . An RP is required only in networks running Protocol Independent Multicast dense mode (PIM DM). C . The mu lticast receivers must register with the RP to form the multicast distribution tree. D . An RP is required only in networks running Protocol Independent Multicast sparse mode (PIM SM). E . An RP is required only in networks running Protocol Independent Mu lticast sparse - dense mode (PIM - SDM). F . To form the multicast distribution tree, the multicast sources register with and the receivers join the RP.

A . 3600 series B . 7200 series with NSE-1 C . 7500 series D . 12000 serie

A .  multicast routing uses RPF B .  multicast routing is connectionless. C .  In multicast routing， the source of a packet is known. D .  When network topologies change， multicast distribution trees are not rebuilt， but use the originalpath E .  Multicast routing is much like unicast routing， with the only difference being that it has a a groupof receivers rather than just one destinatio

A . globally scoped address range B . 239.0.0.X or 239.128.0.X address range C . administratively scoped address range that does not overlap with a link-local MAC address D . any Class D address range E . site-local scoped address range

A . mesh bridge in B . regular C . bi-directional bridge D . in E . out

A . only the low-order 23 bits of the MAC address are used to map IP addresses B . only the low-order 24 bits of the MAC address are used to map IP addresses C . only the high-order 23 bits of the MAC address are used to map IP addresses D . only the low-order 23 bits of the IP address are used to map MAC addresses E . the 0x01004f MAC address prefix is used for mapping IP addresses to MAC addresses F . the 0x01005e MAC address prefix is used for mapping IP addresses to MAC addresse

A . Multicast traffic is sent out on Cisco APs at the highest mandatory data rate. B . Multicast traffic is sent out on Cisco APs at the highest supported data rate. C . On Cisco APs， multicast traffic and beacons are sent out at the same data rates to maintain a common cell size for normal data as well as multicast data. D . If there is more than one mandatory data rate， multicast traffic will be sent at the highest mandatory rate and beacons will be sent at the lowest mandatory rate. E . On Cisco APs， multicast traffic will be sent out at the highest data rate that a client can maintain with the AP.

A . IP PIM RP-address B . IP PIM ssm C . IP PIM Sparse-mode D . IP PIM Passive

A . Fa6/28 B . Fa7/20 C . Gi3/7 D . Fa4/2 E . Fa4/14 F . Fa4/38

A . First （most significant ） octet is FF in hex B . Starts with a prefix of FE80 to FEBF in hex C . Starts with a prefix of FECO to FEFF in hex D . Second octet contains a 4-bit multicast scope field E . Last 64 bit contains the modified MAC address of the Ethernet interface F . Is allocated from the unicast address space