At which of the following layers of the OSI model will the administrator MOST likely start to troubleshoot?

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A network is experiencing a number of CRC errors during normal network communication.

At which of the following layers of the OSI model will the administrator MOST likely start to troubleshoot?
A . Layer 1
B . Layer 2
C . Layer 3
D . Layer 4
E . Layer 5
F . Layer 6
G . Layer 7

Answer: B