A network engineer is dispatched to an employee office to troubleshoot an issue with the employee’s laptop. The employee is unable to connect to local and remote resources. The network engineer flips the laptop’s wireless switch on to resolve the issue. At which of the following layers of the OSI model was the issue resolved?
A. Layer 1 B. Layer 2 C. Layer 3 D. Layer 4 E. Layer 7
Correct Answer: A
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 transmittions In this question, the network engineer flipped the laptop’s wireless switch on to resolve the issue. The laptop was unable to connect to the wireless network because the wireless network interface card was switched off. Switching the wireless network interface card on enabled the laptop to connect to the wireless network. The wireless network interface card is a physical layer device.