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 - DMB、PIM - SMC、PIM - RPD、CGMPE、IGMP snooping

第1题：

第2题：

Which tech nology manages multicast traffic at Layer 2 by configuring Layer 2 LAN interfaces dynamically to forward multicast traffic only to those interfaces that want to receive it?（）

• A、IGMP
• B、IGMP snooping
• C、PIM - DM
• D、DVMRP
• E、MOS PF

正确答案:B

第3题：

Which three statements regarding Cisco ASAmulticast routing support are correct？ （）

• A、 ASA supports both stubmulticast routing and PIMmulticast routing. However， you cannot configure bothconcurrently on a single security appliance
• B、 When configured for stubmulticast routing， the ASA can act as the Rendezvous Point （RP）
• C、 If the ASAdetects IGMPversion1 routers， the ASAwill automatically switch to IGMP version 1 operations.
• D、 The ASA supports both PIM-SM and bi-directional PIM
• E、 Enabling multicast routing globally on the ASA automatically enables PIM and IGMP on all interfaces
• F、 The ASA can be configured for IGMP snooping toconstrain theflooding of multicast traffic by dynamically configuring themulticast traffic to be forwarded only those interfaces associated with hosts requesting themulticast group

正确答案:A,D,E

第4题：

In PIM-SM what control plane signaling must a multicast source perform before it begins to send multicasttraffic to a group？（）

• A、The source must send a PIM Register message to the rendezvous point （RP）.
• B、The source must first join the multicast group using IGMP before sending.
• C、The source must perform a Request to Send （RTS） and Clear to Send （CTS） handshake with the  PIM designated router （DR）.
• D、No control plane signaling needs to be performed； the source can simply begin sending on the local  subnet.

正确答案:D

第5题：

Which type of domains is interconnected using Multicast Source Discovery Protocol？（）

• A、PIM-SM
• B、PIM-DM
• C、PIM-SSM
• D、DVMRP

正确答案:A

第6题：

In PIM-SM what control plane signaling must a multicast source perform before it begins to send multicast traffic to a group？（）

• A、The source must send a PIM Register message to the rendezvous point （RP）
• B、The source must first join the multicast group using IGMP before sending
• C、The source must perform a Request to Send （RTS） and Clear to Send （CTS） handshake with the PIM designated router （DR）
• D、No control plane signaling needs to be performed；the source can simply begin sending on the local subnet

正确答案:D

第7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8题：

Which of these statements about PIM join messages in classic PIM-SM is correct？（）

• A、PIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree.
• B、Routers send a PIM join acknowledgement in response to each PIM join message received from a downstream router.
• C、PIM join messages are only sent when the multicast distribution tree is first being established.
• D、PIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree.

正确答案:A

第9题：

How is RPF used in multicast routing？（）

• A、to prevent multicast packets from looping
• B、to prevent PIM packets from looping
• C、to instruct PIM where to send a （*， G） or （S， G） join message
• D、to prevent multicast packets from looping and to instruct PIM where to send a （*， G） or （S， G） joinmessage

正确答案:D

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第14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15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16题：

What is the purpose of IGMP in a multicast implementation？（）

• A、 it is not used in multicast
• B、 it determines the virtual address group for a multicast destination
• C、 it dynamically registers individual hosts in a multicast group on a specific LAN
• D、 it is used on WAN connections to determine the maximum bandwidth of a connection
• E、 it determines whether Bidirectional PIM or PIM sparse mode will be used for a multicast flow

正确答案:C

第17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18题：

In PIM-SM operations，to which device does the first router that connects with the multicast source sendthe register message？（）

• A、RP
• B、multicast source
• C、IGMP router
• D、multicast receiver
• E、PIM designated router

正确答案:A

第19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20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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