When IP multicast is enabled via PIM, which mode uses the flood and prune metho d? Select the best response.()A. PIM sparse - denseB. Bidir - PIMC. PIM - RPD. PIM - DME. PIM - SM

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第2题：

Which two statements are true about the rendezvous poin t (RP) in a multicast network?（）

• 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 multicast 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 Multicast sparse - dense mode (PIM - SDM).
• F、To form the multicast distribution tree, the multicast sources register with and the receivers join the RP.

正确答案:D,F

第3题：

Which two multicast protocol statements are true？ （Choose two.）  （）

• 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.

正确答案:B,C

第4题：

Which three statements are true about IP multicast configuration?（）

• A、PIM sparse - dense mode and PIM dense mode require an RP on the network.
• B、PIM sparse mode and PIM dense mode require an RP on the network.
• C、PIM sparse mode interfaces are always added to the multicast routing table in a router.
• D、PIM sparse mode and PIM sparse - dense mode require an RP on the network.
• E、PIM dense mode interfaces are always added to the multicast routing table in a router.
• F、PIM sparse - dense mode acts as PIM dense mode if an RP is not known.

正确答案:D,E,F

第5题：

Which statement is correct in reference to IPv6 multicast？（）

• A、IPv6 multicast uses Multicast Listener Discovery.
• B、The first 8 bits of an IPv6 multicast address are always FF （1111 1111）.
• C、IPv6 multicast requires MSDP.
• D、PIM dense mode is not part of IPv6 multicast.

正确答案:A

第6题：

Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on all interfaces in the network to support a new video streaming application. No other multicast configuration was applied anywhere in the network. Since enabling multicast， the network monitoring tools show periodic spikes in link utilization throughout the network， even in areas where the video application is not being used. What could be a possible cause？（）

• A、PIM sparse mode is being used.
• B、PIM dense mode is being used.
• C、The BGP multicast address family has not been configured.
• D、IGMP version 3 is being used.
• E、IP PIM neighbor filters have not been applied.

正确答案:B

第7题：

When IP multicast is enabled via PIM, which mode uses the flood and prune metho d? Select the best response.（）

• A、PIM sparse - dense
• B、Bidir - PIM
• C、PIM - RP
• D、PIM - DM
• E、PIM - SM

正确答案:D

第8题：

Which two statements are true about the rendezvo us point (RP) in a multicast network?（）

• 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.

正确答案:D,F

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第13题：

Choose two commands that are required to enable multicast on a router， when it is known that thereceivers use a specific functionality of IGMPv3.（）

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

正确答案:B,C

第14题：

Which command can be used to check the assignment of RPs to multicast groups？（）

• A、show ip pim rendez-vous
• B、show ip rpf rp mapping
• C、show ip pim rp mapping
• D、show ip pim rp info
• E、show ip pim

正确答案:C

第15题：

When building an IP multicast domain using PIM which mode assumes  that other routers do not want to forward multicast packets for the group?（）

• A、PIM - DM
• B、PIM - SM
• C、PIM - RP
• D、CGMP
• E、IGMP snooping

正确答案:B

第16题：

Which three statements best describe multicast operation on Cisco Nexus switches in a data center？（）

• A、 Cisco NX-OS Software does not support PIM dense mode.
• B、 The command ip multicast-routing must be enabled in Cisco NX-OS Software before any multicast configuration is possible on the switch.
• C、 PIM CLI configuration and verification commands are not available until you enable the PIM feature with the feature pim command.
• D、 Cisco NX-OS Software supports multicast routing per Layer 3 VRF instance.
• E、 The default PIM operational mode on the Cisco Nexus 7000 switch is SSM.

正确答案:A,C,D

第17题：

Which two statements are tru e about the rendezvous point (RP) in a multicast network?（）

• 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 multicast 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 Pro tocol Independent Multicast sparse - dense mode (PIM - SDM)
• F、To form the multicast distribution tree, the multicast sources register with and the receivers join the RP

正确答案:D,F

第18题：

What is the purpose of a rendezvous point (RP)?（）

• A、acts as a meeting place for sources and receivers of multicast traffic
• B、used in PIM dense m ode to create a database of all multicast sources
• C、used in PIM dense and sparse mode to create a database of all multicast sources
• D、acts as the designated router for a broadcast segment when multicast routing is enabled

正确答案:A

第19题：

Which two commands are required to enable multicast on a router， knowing that the receivers only support IGMPv2？（）

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

正确答案:A,C

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