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Topic 109 · Networking Fundamentals

109.1 Fundamentals of internet protocols

Step 1 of 10 · weight 4

Why TCP/IP

Early topologies could not carry today's internet. What remains is the TCP/IP stack. The short name is still TCP/IP, but the stack also holds UDP, ICMP, and DNS.

A ring dies if one cable breaks. A star needs too many cables. A bus stays in special systems. A mesh stays in Wi-Fi and some private networks
IP answers how one device finds another. TCP answers how the data is delivered
Postal picture: IP is the house address. TCP is the letter sent to that address

Exam note

Weight 4. The goal is not to design a network. Writing the address into Linux is the next lesson, 109.2.