Lesson 9-Network Fundamentals . Introduction. The Internet is a giant network consisting of interconnected PCs, servers, routers, and switches. This presentation focuses on a widely accepted definition of a network to mean any series of interconnected information systems and devices.
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Example of a corporate network with interconnected LANs and WANs
The OSI Model
Logical layout of an IP packet
TCP’s three way handshake
Logical depiction of NAT