Data communication
It is like…
Network Layers Are Like Posting a Parcel
Protocol layering is like sending a parcel by post
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Lesson notes
Key points
- You write a letter, seal it in an envelope, and the post office adds a label before trucking it away.
- Each layer wraps the data with its own header, like envelopes and labels, and the receiver unwraps them in reverse.
- Unlike one parcel, data is often split into many packets that take different routes and get reassembled, and some get resent.
Takeaway: Each layer wraps data going down and unwraps it coming up.
Quick check: What is adding a header at each layer as data moves down called?
- Encapsulation
- Multiplexing
- Modulation
Each layer wraps the data with its header: encapsulation.
The parcelEncapsulationWhere it breaks
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