In this section, we will discuss some of the most common devices that constitute network infrastructure. We will categorize the devices according to the main OSI layer at which they operate (you remember your OSI layers from Chapter 1, The OSI Reference Model and the TCP/IP Stack, right?) and discuss the main functions and features that each device provides.
Networking devices and their deployment
Layer 1 devices
Layer 1 (Physical Layer) devices are responsible for manipulating the electromagnetic and optical signals that carry the bits of data through both wired and wireless media.
