04 Try it yourself Interactive
The same 38-byte request from section 02, the same two addresses, the same byte counts. Encapsulate walks down the sender’s stack: each step adds a header, and the block that was added on that step turns green in the byte layout. Decapsulate walks up the receiver’s stack: the header the current layer is about to check and discard turns rose, and the field list becomes a list of what this layer verified before it stripped anything. The four counters are computed from the byte sizes on screen, so the overhead figure is arithmetic and not an assertion. Nothing plays on its own: Next, Back and Reset, or the arrow keys.