350-401 Practice Question: An engineer is configuring multicast on a Cisco…

An engineer is configuring multicast on a Cisco router. The router receives multicast traffic from a source on interface GigabitEthernet0/0 and needs to forward it to receivers on interface GigabitEthernet0/1. The engineer enables PIM sparse mode on both interfaces and configures a static RP. However, the router does not create a multicast routing entry for the (S,G) pair. What is the most likely missing configuration?

⚠ Common exam trap

Cisco often tests the prerequisite of 'ip multicast-routing' as a hidden requirement, leading candidates to focus on PIM modes or RP configuration while overlooking the fundamental global enablement command.

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

✓

The global command 'ip multicast-routing' is not configured.

The most likely missing configuration is the global command 'ip multicast-routing'. Without this command, the router cannot enable multicast forwarding or build multicast routing tables, regardless of PIM configuration on interfaces or static RP definition. PIM sparse mode and RP configuration are dependent on multicast routing being globally enabled first.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The global command 'ip multicast-routing' is not configured.
Why this is correct
Correct because this command is required to enable multicast routing on the router.
✗
The interface GigabitEthernet0/0 is not configured with an IP address.
Why it's wrong here
Incorrect because the interface must have an IP address, but the scenario implies it is receiving traffic, so it likely has an IP.
✗
The RP address is not reachable from the router.
Why it's wrong here
Incorrect because the RP is needed for group-to-RP mapping, but the (S,G) entry should still be created if the source is directly connected.
✗
The router is not configured as a candidate RP.
Why it's wrong here
Incorrect because the router does not need to be an RP to forward multicast traffic.

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Last reviewed: Jul 4, 2026

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