Palo Alto Networks NGFW Engineer — Question 24

Which networking technology can be configured on Layer 3 interfaces but not on Layer 2 interfaces?

Answer options

• A. DDNS
• B. Link Duplex
• C. NetFlow
• D. LLDP

Correct answer: A

Explanation

DDNS, or Dynamic Domain Name System, operates at Layer 3 since it involves IP addresses and DNS resolution, making it suitable for Layer 3 interfaces. In contrast, Link Duplex, NetFlow, and LLDP are technologies that function at Layer 2 or relate to data link layer operations, so they cannot be configured on Layer 3 interfaces.