Which action does the router take as it forwards a packet through the network?
A.
The router replaces the source and destination labels with the sending router interface label as a source and the next hop router label as a desbnabon
B.
The router encapsulates the source and destination IP addresses with the sending router P address as the source and the neighbor IP address as the destination
C.
The router replaces the original source and destination MAC addresses with the sending router MAC address as the source and neighbor MAC address as the destination
D.
The router encapsulates the original packet and then includes a tag that identifies the source router MAC address and transmit transparently to the destination
The router replaces the original source and destination MAC addresses with the sending router MAC address as the source and neighbor MAC address as the destination. Cisco routers select forwarding paths by longest-prefix match first, then administrative distance and metric when comparable routes compete. Cisco CCNA 200-301 v1.1 includes this under IP Connectivity, where the exam expects engineers to recognize the device behavior that actually produces the required outcome. The question is best solved by reading the operational clue rather than choosing a familiar acronym. The wrong choices either do not match the destination, use the wrong next hop, or fail to provide the intended primary/backup behavior. In a production network, the wrong choice would normally create an outage, leave a management or security gap, or send troubleshooting toward the wrong subsystem. The selected answer is the one that matches the control-plane, data-plane, wireless, security, services, or automation mechanism described in the question. That is why it remains the verified answer for this item.
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