When configuring the multicast routing protocol, you first need to execute the () routing-enable command, and then perform related configurations of the PFM protocol.

Question

Options

• Amulticast
• Bunicast
• CIGMP
• DPIM

• A
  76% (39)
• B
  2% (1)
• C
  14% (7)
• D
  8% (4)

Explanation

Option A is correct because the full command multicast routing-enable must be executed first to globally enable the multicast routing function on the device; without this step, any subsequent PIM protocol configuration will have no effect. Option B (unicast) is wrong because unicast and multicast are separate routing paradigms, and enabling unicast routing does nothing to activate multicast forwarding. Option C (IGMP) is wrong because IGMP is a host-to-router group membership protocol, not the command keyword used to enable multicast routing. Option D (PIM) is wrong because PIM is the protocol you configure after enabling multicast routing, not the enabling command itself - it is the destination of the configuration process, not the prerequisite.

Memory tip: The order mirrors the logic - you must turn on the multicast engine before you can configure its protocols. The command starts with "multicast" because that is the feature being switched on, making A the only choice that matches the function being performed.

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