CompTIA Network+ (N10-008) — Question 287

At which of the following layers of the OSI model will the administrator MOST likely start to troubleshoot when a network is experiencing a number of CRC errors?

Answer options

• A. Layer 1
• B. Layer 2
• C. Layer 3
• D. Layer 4
• E. Layer 5
• F. Layer 6
• G. Layer 7

Correct answer: A

Explanation

The correct answer is A, Layer 1, as CRC errors are typically associated with physical layer issues such as cable damage or interference. The other layers (B through G) deal with logical connections and data handling rather than the physical transmission of data, which is where CRC errors originate.