A frame arrives at a switch and fails FCS. Which two interface counters increase? (Choose two.)
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Correct answer: input errors, CRC.
Why this is the answer
When a frame arrives at a switch and fails the Frame Check Sequence (FCS) validation, it indicates a data corruption issue during transmission. The input errors counter increments because the switch detected a problem with the incoming frame, classifying it as an error. Specifically, the CRC (Cyclic Redundancy Check) counter also increments because FCS is implemented using a CRC algorithm. A failed FCS means the calculated CRC value at the receiver does not match the CRC value sent by the transmitter. frame is a general counter for received frames, not specifically errors. giants counts frames larger than the maximum legal size (e.g., 1518 bytes for Ethernet), and runts counts frames smaller than the minimum legal size (e.g., 64 bytes for Ethernet). Neither of these directly relates to an FCS failure on a properly sized frame.
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