JNCIP-ENT: Juniper Networks Certified Professional – Enterprise Routing (2023) — Question 28

You have an MX960 configured as a Fusion aggregation device (AD) and two QFX5100 switches as satellite devices (SD). You have configured local- switching for each SD. A packet with an unknown MAC address is received on one of the SD extended ports.
Which statement is correct in this scenario?

Answer options

• A. The packet is dropped and a reject message is sent out to the port where it was received.
• B. The packet is silently discarded and a reject message is sent to the AD.
• C. The packet is flooded out of all the ports on the SD except the one where it was received.
• D. The packet is sent to the AD to be processed and forwarded.

Correct answer: D

Explanation

The correct answer is D because, in a local-switching scenario with unknown MAC addresses, the packet needs to be sent to the aggregation device for further handling. Options A and B incorrectly describe the packet's handling as dropping or silently discarding it without forwarding it to the AD, while option C suggests an incorrect flooding behavior that does not apply in this case.