JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 19

If an EX Series switch receives a frame with a known destination MAC address, what is the expected behavior?

Answer options

• A. The frame is sent out all ports assigned to the associated VLAN except the ingress port on which the frame was received.
• B. The frame is sent out all ports assigned to all configured VLANs except the ingress port on which the frame was received.
• C. The frame is sent out all trunk ports associated with the ingress VLAN regardless of whether a matching MAC address was found in the bridge table.
• D. The frame is sent out the egress port with a matching destination MAC address within the bridge table associated with the ingress VLAN.

Correct answer: D

Explanation

The correct answer is D because the switch uses the bridge table to find the egress port associated with the known destination MAC address. Options A and B are incorrect as they describe broadcasting the frame instead of directing it to a specific port. Option C is also incorrect since it implies broadcasting regardless of the MAC address presence, which does not align with the expected behavior of the switch.