Question

What must happen for a telegram to reach a device located on a different line of the same area?

KNX BasicLearnKNX TopologyMedium
Answer

B — It must be transmitted via the main line, routed by the line couplers of both lines.

Correct: A line-crossing telegram travels up to the main line and back down, routed by the line couplers of the source and destination lines.

Source

KNX Basic Course Documentation — 3.12 — p. 76

All proposed choices (exam context)
  1. A.It travels directly from one line to the other without any coupler.
  2. B.It must be transmitted via the main line, routed by the line couplers of both lines.
  3. C.It must always be routed over the backbone line.
  4. D.It must be resent manually because lines cannot exchange telegrams.
Full bank

Keep going with the full KNX Basic bank

Keep going with the full KNX Basic bank: unlimited timed mock exams, detailed answers, history. From €9 (one-time payment).

See pricing — from €9
Want more?

See the 9 other KNX Basic practice questions

Related questions

Question from our independent practice bank. KNX Basic is a registered trademark of KNX Association, not affiliated with CertifBus.

Last updated: 19 May 2026

See pricing — from €9
KNX Basic pack · from €9
KNX BASIC & ADVANCED

Ready to find out where you really stand?

10 free questions every day, no account needed. Full access only if you decide to go all the way.

+1/−0,5 official scoringFR·EN·DE interface and explanations9 from · one-time payment
Newsletter

Get launch announcements

We'll email you when new KNX questions, a guide or a tool is published. No spam.

Unsubscribe in 1 click. No sharing with third parties.