CompTIA Network+ (N10-008) — Question 673

A technician reviews a network performance report and finds a high level of collisions happening on the network. At which of the following layers of the OSI model would these collisions be found?

Answer options

• A. Layer 1
• B. Layer 3
• C. Layer 4
• D. Layer 7

Correct answer: A

Explanation

Collisions are physical layer issues, which correspond to Layer 1 of the OSI model, where data transmission occurs over the medium. Layers 3, 4, and 7 deal with logical addressing, transport, and application-level functions, respectively, and do not directly involve the physical transmission of data where collisions would occur.