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【单选题】

Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on allinterfaces in the network to support a new video streaming application. No other multicast configuration wasapplied 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.

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更多“Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on allinterfaces in the network to support a new video streaming application. No other multicast configuration wasapplied 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？（）”相关的问题
第1题
[单选题] 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.  

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第2题
[单选题] Apart from interdomain multicast routing， what else is MSDP used for？（）

A、Source Specific Multicast and IGMPv2  B、Announcing multicast sources to BGP speakers  C、Anycast RP  D、Intradomain multicast routing  

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第3题
[多选题] In computer networking a multicast address is an identifier for a group of hosts that have joined amulticast group. Multicast addressing can be used in the Link Layer （OSI Layer 2）， such as Ethernet Multicast， as well as at the Internet Layer （OSI Layer 3） as IPv4 or IPv6 Multicast. Whichtwo descriptions are correct regarding multicast addressing？（）

A、The first 23 bits of the multicast MAC address are 0x01-00-5E. This is a reserved value thatindicates a multicast application  B、The last 3 bytes （24 bits） of the multicast MAC address are 0x01-00-5E. This is a reservedvalue that indicates a multicast application  C、To calculate the Layer 2 multicast address， the host maps the last 23 bits of the IP address intothe last 24 bits of the MAC address. The high-order bit is set to 0  D、The first 3 bytes （24 bits） of the multicast MAC address are 0x01-00-5E. This is a reservedvalue that indicates a multicast application  

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第4题
[单选题] What is the encapsulation format of an MPLS Multicast VPN （MVPN） packer？（）

A、IP unicast in IP unicast  B、IP multicast in IP anycast  C、IP anycast in IP anycast  D、IP multicast in IP unicast  E、IP multicast in IP multicast  F、IP unicast in IP multicast  

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第5题
[] In multicast network how to select DR？ and what is the order？

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第6题
[简答题] what is multicast scoping？

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第7题
[简答题] what is multicast snooping？

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第8题
[多选题] Which two of these are characteristics of multicast routing？ （）

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 destination  

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第9题
[单选题] Which statement correctly describes a wireless client Layer 2 roam from AP1 to AP2 while joined to a multicast stream using Cisco WLC running v5.2?（）

A、Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from Cisco WLC after AP1 issues an IGMP query.  B、Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from Cisco WLC independent of AP1 multicast member status.  C、Client resumes multicast after association with AP2, because multicast information is sent in mobility exchanges and AP2 is already a member of the multicast group, provided that another client has already joined that multicast.  D、Client resumes multicast after association with AP2, because multicast information is sent in mobility exchanges and AP2 is already a member of the multicast group, regardless if any other clients have already joined that multicast.  

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第10题
[单选题] What is the purpose of the WLC Controller->Multicast->IGMP Timeout feature operating on v5.2?（）

A、to determine if there are more clients that are using the multicast stream  B、to limit the time that a client has to request an IGMP join to the controller multicast group  C、to determine if the multicast router is still alive and responding to multicast clients  D、to remove clients from the multicast group if the multicast traffic exceeds the allotted bandwidth allowed for multicast clients  

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