350-501 Services Practice Question
During a multicast deployment, some receivers are not receiving the stream. The PIM neighbor table shows the upstream interface is correct. Which command would verify whether the multicast routing table has the correct outgoing interface list?
⚠ Common exam trap
Cisco often tests the distinction between the multicast routing table (show ip mroute) and PIM neighbor or IGMP group commands, trapping candidates who confuse neighbor reachability with correct forwarding interface configuration.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show ip mroute
The 'show ip mroute' command displays the multicast routing table, including the outgoing interface list (OIL) for each multicast group. Since the PIM neighbor table confirms the upstream interface is correct, the issue likely lies in the OIL, which 'show ip mroute' directly verifies. This command shows which interfaces are forwarding multicast traffic and whether they are pruned or in a forwarding state.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
show ip igmp groups
Why it's wrong here
Shows IGMP membership, not multicast routing.
- ✗
show ip pim neighbor
Why it's wrong here
Shows PIM neighbors, not routing table.
- ✓
show ip mroute
Why this is correct
Shows multicast routing table, including incoming and outgoing interfaces.
- ✗
show ip route
Why it's wrong here
Shows unicast routing table only.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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