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| Question ID 18553 | Which protocol is the encapsulating protocol for mtrace packets?
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| Option A | ICMP
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| Option B | IGMP
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| Option C | PIM
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| Option D | GRE
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| Correct Answer | B |
Explanation Explanation: mtrace is a diagnostic tool to trace the multicast path from a specified source to a destination for a multicast group. It runs over IGMP protocol. Mtrace uses any information available to it to determine a previous hop to forward the trace towards the source. Reference: http://www.brocade.com/downloads/documents/html_product_manuals/NI_05500c_MULTI CAST/wwhelp/wwhimpl/common/html/wwhelp.htm#context=NI_MCAST&file=IP_Multicast. 3.04.html
| Question ID 18554 | Which technology can be used to prevent flooding of IPv6 multicast traffic on a switch?
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| Option A | IGMP snooping
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| Option B | IGMP filtering
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| Option C | MLD snooping
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| Option D | MLD filtering
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| Correct Answer | C |
Explanation Explanation: MLD snooping allows the switch to examine MLD packets and make forwarding decisions based on their content. You can configure the switch to use MLD snooping in subnets that receive MLD queries from either MLD or the MLD snooping querier. MLD snooping constrains IPv6 multicast traffic at Layer 2 by configuring Layer 2 LAN ports dynamically to forward IPv6 multicast traffic only to those ports that want to receive it. Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/snoopmld.html