Answer A,D is correct: A. Add or remove an 802.1Q trunking header.; D. Match the destination MAC address to the MAC address table.. The data plane performs packet and frame forwarding work in hardware or forwarding logic. Adding or removing an 802.1Q trunking tag is a forwarding operation, and matching the destination MAC address against the MAC address table is also data-plane switching behavior. NETCONF configuration changes are management-plane activity. Routing protocols run in the control plane because they build reachability information used by the forwarding process. Replying to an ICMP echo request directed at the device itself is device control/management handling, not transit forwarding. Cisco CCNA 200-301 v1.1 Automation and Programmability asks candidates to separate control, data, and management planes because controller-based networking depends on that model. The corrected pair is the 802.1Q header operation and MAC-table lookup.
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