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.
National Initiative for Cybersecurity Careers and Studies
The Open System Interconnection (OSI) model divides network communication into seven layers. Explore the seven layers of the OSI model.
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