04 Try it yourself Interactive

Which layer owns this problem?

“Which layer does this happen at” is the most common OSI interview question, and guessing a plausible layer looks identical to knowing the right one until the follow-up arrives. Pick a symptom. Each press of Next rules out one tempting layer by naming something it does not have, then names the owner. Nothing plays on its own.

Problem 1 of 5
a receiver that cannot keep up
Rose marks a layer ruled out, with the reason in the narration. Green marks the layer that owns the problem. No mark means not yet considered.
Press Next to begin. Each press moves the diagnosis one step.


      

        
Problem1 / 5

        
Layer under test–

        
Owner–

        
Ruled out0

      


      

      

        
        
        
        step 0 / 0