IP address and railway track: what they have in common

1. Step 1. IP address — is a kind of — TCP/IP. Part of IP.
2. Step 2. TCP/IP — is used in — Router. IP routing.
3. Step 3. Router — uses — Packet switching. It forwards packets.
4. Step 4. Packet switching — works like — Electrical telegraph. An analogy: telegraph messages were passed from station to station with intermediate storage — a “store and forward” principle similar to packet transmission.
5. Step 5. Electrical telegraph — is used in — Time zones. Synchronizing time by telegraph.
6. Step 6. Time zones — was inspired by — Railway track. Introduced because of railway timetables.

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