フリー問題

問題文

An interface reports a steadily increasing number of frame check errors on input while the link stays up. What does that most directly indicate?

選択肢

1. Frames are arriving damaged, so the physical path or the cabling should be examined.
2. The interface address is duplicated elsewhere on the segment, so the conflicting replies are recorded as failed frame checks.
3. The routing protocol has not converged yet.
4. A firewall filter is discarding the frames, and the discarded frames are counted as check errors because the filter drops them before the check value can be verified by the receiving interface.