Cisco CCNA Exam: Switching Methods | Duplicating First Six Bytes | Cisco 200-125

Duplicating First Six Bytes of a Frame | Cisco CCNA Switching Methods

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Which switching method duplicates the first six bytes of a frame before making a switching decision?



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A. B. C. D.


Store-and-forward switching is a method of forwarding network data packets in which the entire packet is received before forwarding it to the next hop. This method allows the switch to check the integrity of the packet before forwarding it, by performing a CRC check on the entire packet.

As part of the store-and-forward process, the switch duplicates the first six bytes of the frame, which contain the destination MAC address, and uses them to make a switching decision. This is done to avoid errors that could result from a truncated or corrupted frame. Once the switch has made a decision, it forwards the entire frame to the appropriate destination port.