CompTIA Network+ (N10-007) — Question 13

A user reports difficulties connecting a PC to a wired network. The PC connects to an IP phone, which is working correctly. A network technician can verify that other devices successfully connect to the phone. At which of the following layers of the OSI model is the problem MOST likely located?

Answer options

• A. Network
• B. Physical
• C. Transport
• D. Application

Correct answer: A

Explanation

The problem is most likely at the Network layer (Layer 3) because the PC connects to the IP phone, which indicates that the Physical layer (Layer 1) is functioning correctly. The Transport (Layer 4) and Application (Layer 7) layers are not relevant in this scenario since the issue pertains to the network connectivity rather than data transmission or application functionality.