Different network devices function at different network communication layers, depending on their purpose. Using the TCP/IP model, identify the highest layer accessed by each of the following devices:

a. Router
b. Unmanaged switch
c. Wireless access point
d. Firewall

The highest layer accessed by each of the following devices are:-

Router: Network/internet  layer.

Unmanaged switch: Application layer

Wireless access point:Application layer

Firewall: Transport layer and the Network layer

Explanation:

TCP/IP stands for Transmission Control Protocol/ Internet Protocol

The TCP/IP networking model has four layers, namely,

Application layerTransport layer.Internet layer .Network interface layer.Application layer:This is the highest layer or level of the OSI Model.It allows the user to interact with the software applications.Transport Layer:This layer builds on the network layer to transfer data  from a process on a source system machine to a process on a destination system.Internet Layer:This layer is also known as the network layer.It is responsible for the transportation of Packets from any network or computer irrespective of the route it takes.Network interface Layer: This layer is also called a network access layer. It helps you to defines details of how data should be sent using the network.

Aconsequence when using open source software is c. no support