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Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide by Wendell Odom

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Analyzing and Predicting Normal Network Operation

Any network’s job is to deliver data from one end-user device to another. To analyze a network, an engineer needs to understand the logic used by each successive device as it forwards the data to the next device. By thinking about what should happen at each device, the engineer can describe the entire flow of data.

The term data plane refers to actions devices take to forward data. To forward each frame or packet, a device applies its data plane logic and processes to the frame or packet. For example, when a LAN switch receives a frame in an interface in VLAN 3, the switch makes a forwarding decision based on the VLAN 3 entries in the MAC address table, and forwards the packet. All this logic ...

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