Introduction to Computer Science and Engineering
Explainer
Why the internet chops your data into packets
Your WhatsApp photo travels as hundreds of separate pieces, not one file.
Quick check · tap an answer to continue
Lesson notes
Key points
- Packet switching splits a message into small packets, each carrying a header with source and destination addresses.
- Routers forward each packet independently, so packets from one photo may take different paths and arrive out of order.
- Circuit switching, used by old telephone networks, reserves one dedicated path for the whole call, even during silence.
- Sharing links makes packet switching efficient and resilient, because traffic can route around a failed router.
Definitions
- Packet switching
- Sending data as small independent packets, each routed separately and reassembled at the destination.
Takeaway: The internet shares links by routing small packets independently.
Quick check: Which network reserves a dedicated path for a whole session?
- Packet switching
- Circuit switching
- Cloud switching
Packet switchingRoutersCircuit switchingResilience
Lessons like this, for your syllabus.
Short narrated study videos written for your course, level and exam. Free to start.
Get lessons for your own syllabus