Figure 2.
OSI Comparison with TCP/IP: The layers upwards become more abstract at each step; conversely, the layers downward becomes more concrete and physical
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.