300-360 Question #89: Real Exam Question with Answer & Explanation

The correct answer is B: show ip mroute. The 'show ip mroute' command displays the IP multicast routing table, which includes (S,G) - source and group - entries. This is the primary tool for identifying where multicast traffic originates and how it is being forwarded through the network. When multicast works on the wire

Question

A network engineer is having wireless multicast fail when it hits the wired network. What command will show the source of multicast groups for troubleshooting?

Options

Ashow ip igmp
Bshow ip mroute
Cshow ip mcache
Dshow ip interface counts
Eshow ip route

Explanation

The 'show ip mroute' command displays the IP multicast routing table, which includes (S,G) - source and group - entries. This is the primary tool for identifying where multicast traffic originates and how it is being forwarded through the network. When multicast works on the wireless side but breaks on the wired side, this command reveals whether the router has the correct multicast routing state, including the source IP and the RPF (Reverse Path Forwarding) interface. 'show ip igmp' only shows IGMP group membership on interfaces (who wants the traffic), not routing sources. 'show ip route' is for unicast only. 'show ip interface counts' shows packet statistics, not multicast topology. 'show ip mcache' is not a standard IOS troubleshooting command for this purpose.

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