Question

What characterises 'Case 1' when KNXnet/IP routers are introduced into the topology?

KNX BasicLearnKNX TopologyMedium
Answer

D — The IP routers replace the line couplers, so all main lines and basically the backbone line become Ethernet.

Correct: in Case 1 the IP routers take the line-coupler role, moving the main lines and basically the backbone line onto Ethernet.

Source

KNX Basic Course Documentation — 19 — p. 85

All proposed choices (exam context)
  1. A.Only the backbone couplers are replaced; the normal line couplers remain.
  2. B.Only individual bus devices are swapped for IP devices.
  3. C.The routing counter is switched off on every line.
  4. D.The IP routers replace the line couplers, so all main lines and basically the backbone line become Ethernet.
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Last updated: 19 May 2026

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