... A+,Network+, Security+, I-Net+ How Does Ping Really Work? Copyright ©2006 Global Knowledge Training LLC. All rights reserved.Page 2The layer above the Network Access layer, the Internetworking ... purpose. So, how does this work? BackgroundThe TCP/IP protocol stack is organized as a four-layer model (see Figure 1). The lowest layer, commonly calledthe Network Interface or Network Access ... us use daily, but did you ever stop to wonder how it reallyworked? I don’t know about you, but it bugs me when I do not know how something really works. The pur-pose of this paper is to resolve...