CCNA: Cisco Certified Network Associate — Question 676

Which function generally performed by a traditional network device is replaced by a software-defined controller?

Answer options

• A. building route tables and updating the forwarding table
• B. encapsulation and decapsulation of packets in a data-link frame
• C. changing the source or destination address during NAT operations
• D. encryption and decryption for VPN link processing

Correct answer: A

Explanation

The correct answer is A because a software-defined controller manages the routing logic and forwarding decisions, which were traditionally handled by hardware devices. The other options involve specific functions like packet processing, NAT, and encryption that are not replaced by a software-defined controller.