When a client calls and describes a problem with a computer not being able to reach the Internet, in which of the following places of the OSI model would a technician begin troubleshooting?
A. Transport layer B. Physical layer C. Network layer D. Session layer
Correct Answer: B
Explanation: The bottom layer of the OSI reference model is Layer 1, the physical layer. The physical layer is the layer that defines the hardware elements of a network. These elements include: Network Interface Cards Network topology Network cabling The type of signals used for data transmissions When troubleshooting a network connectivity issue, the first thing you would check is the computer’s network cabling, the network card etc. In other words, the computer’s physical connection to the network.