JNCIA-Junos: Juniper Networks Certified Associate – Junos (2024) — Question 17

Which two statements are correct about MAC addresses? (Choose two.)

Answer options

• A. Switches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.
• B. Switches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.
• C. The source and destination MAC addresses always remains static to the final destination.
• D. The MAC address identifies the physical hardware.

Correct answer: B, D

Explanation

Option B is correct because switches use the destination MAC address to determine where to send the frame next and can change the destination MAC address if necessary. Option D is also correct as the MAC address is specifically used to identify physical hardware on a network. Options A and C are incorrect; A misrepresents how MAC addresses are assigned, and C incorrectly states that MAC addresses do not change, while they can change at different points in a network.