Referring to the exhibit, R1 and R2 are QFX5100s and are acting as VXLAN Layer 2 Gateways for VLAN 100 using PIM-SM signaling. What will cause R2 to send a (*.G) PIM Join towards the RP?

Question

Exhibit

Options

• AR2 will send a (*.G) PIM Join when its VLAN 100 configuration is committed.
• BR2 will send a (*.G) PIM Join when it first learns the MAC address of a locally attached host.
• CR2 will send a (*.G) PIM Join when it receives broadcast, multicast, or unknown unicast traffic
• DR2 will send a (*.G) PIM Join when it receives broadcast, multicast, or unknown unicast traffic

• A
  85% (51)
• B
  5% (3)
• C
  8% (5)
• D
  2% (1)

Explanation

characteristics.html It's A because if you consider that Host B may send zero traffic whatsoever, how can Host A find Host B's MAC address? It would have to ARP for it. So, because Host B may lie dormant until Host A initiates communications, it is completely necessary for R2 to (,G) PIM Join the VXLAN group for VLAN 100. C is impossible before the (,G), B and D are shades of the same chicken-and-egg scenario that makes A the only viable answer.

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