JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 67

Which statement about the default action of MAC limiting is true when the number of MAC addresses has hit the limit set?

Answer options

• A. The switch will shut down MAC learning on the offending port for five minutes.
• B. The switch stops learning MAC addresses on the offending port, but floods traffic out of all ports for the offending MAC address.
• C. The switch stops learning MAC addresses on the offending port, and any traffic to or from the offending MAC address will be dropped.
• D. The switch will shut down the offending port for five minutes.

Correct answer: C

Explanation

The correct answer is C because when the MAC address limit is reached, the switch stops learning on that port and drops any traffic associated with the offending MAC address. Option A is incorrect because it implies a temporary halt to MAC learning, which isn't the case. Option B incorrectly states that traffic is flooded, and option D suggests the port is shut down instead of just stopping MAC learning.