Why study the KNX Topology block for KNX Basic?

The KNX Topology block covers notions that appear repeatedly in the theory and hands-on parts of the KNX Basic exam. Mastering these questions significantly cuts the risk of stalling on this topic on exam day.

How many KNX Topology questions appear in the KNX Basic exam?

Varies by session — typically 2 to 4 questions per block in the KNX Basic theory exam, plus an applied scenario in the practical part where applicable.

KNX Basic · topic block

KNX Topology KNX Basic: exam questions with worked answers

Practice questions from the KNX Topology block of the KNX Basic Certification certification. Detailed corrections, public sources, free to read without sign-up.

56 questions~ 50 minFree · no sign-up

Questions for the "KNX Topology" topic

Q01
For a building planned and commissioned from 2019, what is the ideal maximum number of bus devices per floor?
- A.256
- B.64
- C.255
- D.128
3. KNX Topology· building-and-backbone· Medium
▸
Correct answer
A — 256
Learning tip
Correct: From 2019 an ideal installation has no more than 256 bus devices per floor.
Source: KNX Basic Course Documentation — 3.15 — p. 80
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Q02
Which pairing of date range and ideal bus devices per floor is correct?
- A.Prior to 2018: 256 per floor; from 2019: 64 per floor.
- B.Prior to 2018: 64 per floor; from 2019: 256 per floor.
- C.Prior to 2018: 64 per floor; from 2019: 128 per floor.
- D.Prior to 2018: 255 per floor; from 2019: 255 per floor.
3. KNX Topology· building-and-backbone· Medium
▸
Correct answer
B — Prior to 2018: 64 per floor; from 2019: 256 per floor.
Learning tip
Correct: The ideal figures are 64 per floor prior to 2018 and 256 per floor from 2019.
Source: KNX Basic Course Documentation — 3.15 — p. 80
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Q03
How is faster line-crossing communication achieved when adapting a KNX topology to IP?
- A.Every TP device is replaced by an IP device.
- B.The IP network takes the place of the main/backbone lines, replacing line- and backbone couplers with KNXnet/IP routers.
- C.The TP line speed is increased above 9,600 bit/s.
- D.Line couplers are removed entirely and no filtering is done.
3. KNX Topology· building-and-backbone· Medium
▸
Correct answer
B — The IP network takes the place of the main/backbone lines, replacing line- and backbone couplers with KNXnet/IP routers.
Learning tip
Correct: IP replaces the main/backbone line level and KNXnet/IP routers replace the line/backbone couplers.
Source: KNX Basic Course Documentation — 3.18 — p. 83
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Q04
Using Gigabit switches, how much faster can data be transmitted for line-crossing communication compared with a TP main/backbone line?
- A.About 1,000 times faster.
- B.About 100 times faster.
- C.About 100,000 times faster.
- D.About 10 times faster.
3. KNX Topology· building-and-backbone· Medium
▸
Correct answer
C — About 100,000 times faster.
Learning tip
Correct: The source states data can be transmitted 100,000 times faster with Gigabit switches.
Source: KNX Basic Course Documentation — 3.18 — p. 83
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Q05
Which IP communication method is commonly used by ETS for programming over IP?
- A.Routing.
- B.Multicast broadcasting only.
- C.A serial interface connection.
- D.Tunneling.
3. KNX Topology· building-and-backbone· Medium
▸
Correct answer
D — Tunneling.
Learning tip
Correct: Tunneling is the standardized method commonly used by ETS for programming over IP.
Source: KNX Basic Course Documentation — 3.18 — p. 84
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Q06
What does a coupler's filter table contain?
- A.The individual addresses of all devices on the secondary line.
- B.Every group address used anywhere in the installation.
- C.The routing counter values for each telegram.
- D.The active line-crossing group addresses (linked to devices on both sides of the coupler).
3. KNX Topology· couplers· Medium
▸
Correct answer
D — The active line-crossing group addresses (linked to devices on both sides of the coupler).
Learning tip
Correct: page 69 - the filter table contains the active line-crossing group addresses, i.e. all group addresses linked to bus devices on both sides of the coupler.
Source: KNX Basic Course Documentation — 3.6 — p. 69
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Q07
Which telegrams does a line or backbone coupler forward across the lines it connects?
- A.Only line-crossing telegrams whose group address is in its filter table.
- B.All telegrams it receives, unchanged.
- C.Only telegrams sent to individual addresses.
- D.None - a coupler only galvanically isolates the lines.
3. KNX Topology· couplers· Medium
▸
Correct answer
A — Only line-crossing telegrams whose group address is in its filter table.
Learning tip
Correct: pages 69/71 - couplers route only line-crossing telegrams, i.e. those whose group address is in the filter table; each line works independently.
Source: KNX Basic Course Documentation — 3.6 — p. 69
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Q08
How does a line repeater differ from a line coupler in the way it handles telegrams?
- A.The repeater filters telegrams using a larger filter table.
- B.The repeater has no filter table and passes on all telegrams.
- C.The repeater routes only individually addressed telegrams.
- D.The repeater blocks all telegrams to isolate the segment.
3. KNX Topology· couplers· Medium
▸
Correct answer
B — The repeater has no filter table and passes on all telegrams.
Learning tip
Correct: pages 69/71 - the line repeater has no filter table and therefore passes on all telegrams, unlike a coupler which forwards only line-crossing telegrams.
Source: KNX Basic Course Documentation — 3.6 — p. 69
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Q09
What is the advantage of supplying a coupler from the primary line rather than the secondary line?
- A.It doubles the number of devices allowed on the secondary line.
- B.It removes the need for a choke on the secondary line.
- C.The coupler can report a power failure of the secondary line.
- D.It lets the coupler work without a controller.
3. KNX Topology· couplers· Medium
▸
Correct answer
C — The coupler can report a power failure of the secondary line.
Learning tip
Correct: page 70 - if supplied by the primary line, the coupler can report a secondary line power failure.
Source: KNX Basic Course Documentation — 3.7 — p. 70
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Q10
What determines whether a coupler acts as a backbone coupler, a line coupler or a line repeater?
- A.Three different hardware models are used, one per role.
- B.The number of devices connected to the secondary line.
- C.A hardware switch on the coupler set during installation.
- D.Its location and the assigned individual address.
3. KNX Topology· couplers· Medium
▸
Correct answer
D — Its location and the assigned individual address.
Learning tip
Correct: page 71 - the couplers are identical devices whose task depends on the location and the corresponding assigned individual address.
Source: KNX Basic Course Documentation — 3.8 — p. 71
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Q11
Between which two lines does a backbone coupler (BC) provide the connection?
- A.Between the backbone line and a main line.
- B.Between two secondary lines.
- C.Between a main line and a secondary line.
- D.Between a line segment and the next line segment.
3. KNX Topology· couplers· Medium
▸
Correct answer
A — Between the backbone line and a main line.
Learning tip
Correct: page 71 - the backbone coupler BC provides the connection between the backbone line and the main line.
Source: KNX Basic Course Documentation — 3.8 — p. 71
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Q12
A line coupler (LC) is used to connect which two lines?
- A.The backbone line and a main line.
- B.A main line and a secondary line.
- C.Two line segments of the same line.
- D.The backbone line and a secondary line directly.
3. KNX Topology· couplers· Medium
▸
Correct answer
B — A main line and a secondary line.
Learning tip
Correct: page 71 - the line coupler LC connects the main line and a secondary line.
Source: KNX Basic Course Documentation — 3.8 — p. 71
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Q13
By how many line segments can a line repeater extend a line, at most?
- A.1 line segment
- B.15 line segments
- C.3 line segments
- D.4 line segments
3. KNX Topology· couplers· Medium
▸
Correct answer
C — 3 line segments
Learning tip
Correct: page 71 - a line repeater extends a line by a maximum of 3 line segments.
Source: KNX Basic Course Documentation — 3.8 — p. 71
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Q14
What does a line coupler do with the data communication between the main line and its secondary line?
- A.It forwards all telegrams in both directions.
- B.It monitors the communication both ways and routes only telegrams whose group addresses are in its filter table.
- C.It blocks all traffic between the two lines.
- D.It converts individual addresses into group addresses.
3. KNX Topology· couplers· Medium
▸
Correct answer
B — It monitors the communication both ways and routes only telegrams whose group addresses are in its filter table.
Learning tip
Correct: page 72 - the line coupler monitors data communication between the main line and the secondary line and vice versa, routing only telegrams whose group addresses are stored in its filter table.
Source: KNX Basic Course Documentation — 3.8 — p. 72
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Q15
In an installation with several lines, how is power supplied to the lines?
- A.One central power supply feeds all lines through the couplers.
- B.Only the main line needs a power supply; secondary lines draw from it.
- C.Each line and each line segment has its own power supply unit and choke.
- D.A power supply is needed per area, shared by its lines.
3. KNX Topology· couplers· Medium
▸
Correct answer
C — Each line and each line segment has its own power supply unit and choke.
Learning tip
Correct: page 73 - each line and each line segment must have its own power supply unit and choke.
Source: KNX Basic Course Documentation — 3.9 — p. 73
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Q16
In the practical example, which group address is assigned to push button P1 and the actuators of lamps L11, L12 and L13?
- A.0/2/11
- B.5/2/67
- C.1.1.5
- D.5/2/66
3. KNX Topology· couplers· Medium
▸
Correct answer
D — 5/2/66
Learning tip
Correct: page 74 - group address 5/2/66 is attributed to P1 and to the actuators controlling L11, L12 and L13.
Source: KNX Basic Course Documentation — 3.10 — p. 74
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Q17
The individual address serves to clearly identify a bus device and describes its location within the topology.
TrueFalse
3. KNX Topology· individual-address· Easy
Correct answer
True
Learning tip
Correct. Page 67 states the individual address serves to clearly identify the bus device and describes its location within the topology.
Source: KNX Basic Course Documentation — 3.5 — p. 67
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Q18
The individual address is structured in the order Line.Area.Device (for example 1.1.5).
TrueFalse
3. KNX Topology· individual-address· Easy
Correct answer
False
Learning tip
False. The individual address is structured Area.Line.Device (A.L.B), e.g. 1.1.5 = area 1, line 1, device 5 - not Line.Area.Device.
Source: KNX Basic Course Documentation — 3.5 — p. 67
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Q19
In the individual address, the area field A can address the areas 1 to 16.
TrueFalse
3. KNX Topology· individual-address· Easy
Correct answer
False
Learning tip
False. A = 1...15 addresses the areas 1 to 15 (at most 15 areas). A = 0 addresses the bus devices on the backbone line.
Source: KNX Basic Course Documentation — 3.5 — p. 67
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Q20
What does the value L = 0 address in a KNX individual address?
- A.The first bus device of the line.
- B.The backbone line of the installation.
- C.The main line of the respective area.
- D.The line coupler of the line.
3. KNX Topology· individual-address· Medium
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Correct answer
C — The main line of the respective area.
Learning tip
Correct: page 67 - L = 0 addresses the main line of the respective area.
Source: KNX Basic Course Documentation — 3.5 — p. 67
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Q21
The device field B can address bus devices numbered 1 to 256 on a line.
TrueFalse
3. KNX Topology· individual-address· Easy
Correct answer
False
Learning tip
False. B = 1...255 addresses the bus devices on a line; the maximum device number is 255, not 256. B = 0 addresses the line coupler.
Source: KNX Basic Course Documentation — 3.5 — p. 68
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Q22
A device carries the individual address 1.1.0. What does the device number 0 tell you?
- A.It is the line coupler of that line (x.y.0 addresses the line coupler).
- B.It is the first ordinary bus device on the line.
- C.It is an unloaded device still at its factory default.
- D.It is the backbone coupler of the area.
3. KNX Topology· individual-address· Medium
▸
Correct answer
A — It is the line coupler of that line (x.y.0 addresses the line coupler).
Learning tip
Correct: page 68 - B = 0 addresses the line coupler in the respective line; 1.1.0 is the line coupler of line 1 in area 1.
Source: KNX Basic Course Documentation — 3.5 — p. 68
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Q23
The individual address of an unloaded bus device is 15.15.254.
TrueFalse
3. KNX Topology· individual-address· Easy
Correct answer
False
Learning tip
False. The individual address of an unloaded bus device is 15.15.255 (the maximum address). New devices are typically delivered ex-factory with 15.15.255.
Source: KNX Basic Course Documentation — 3.5 — p. 68
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Q24
Which coupler role(s) can a KNXnet/IP router take on in a KNX installation?
- A.Only a line repeater inside a single line
- B.Only a backbone coupler
- C.Both a line coupler and a backbone coupler
- D.Only a line coupler
3. KNX Topology· ip-and-segment-coupler· Easy
▸
Correct answer
C — Both a line coupler and a backbone coupler
Learning tip
Correct: the source states the KNXnet/IP router can be used as a line coupler as well as a backbone coupler.
Source: KNX Basic Course Documentation — 19 — p. 85
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Q25
What characterises 'Case 1' when KNXnet/IP routers are introduced into the topology?
- A.Only the backbone couplers are replaced; the normal line couplers remain.
- B.Only individual bus devices are swapped for IP devices.
- C.The routing counter is switched off on every line.
- D.The IP routers replace the line couplers, so all main lines and basically the backbone line become Ethernet.
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
D — The IP routers replace the line couplers, so all main lines and basically the backbone line become Ethernet.
Learning tip
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
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Q26
In 'Case 2' of deploying KNXnet/IP routers, what stays and what changes?
- A.The backbone couplers become IP routers, the line couplers remain, and only the backbone line becomes Ethernet.
- B.All line couplers are removed and every main line becomes Ethernet.
- C.Nothing changes physically; only the routing counter is reset.
- D.Each individual device is given a second IP address.
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
A — The backbone couplers become IP routers, the line couplers remain, and only the backbone line becomes Ethernet.
Learning tip
Correct: replacing only the backbone couplers leaves the TP line couplers in place and turns just the backbone line into Ethernet.
Source: KNX Basic Course Documentation — 19 — p. 85
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Q27
In which situation does the high bit rate of the Ethernet backbone NOT prevent problems?
- A.When the routing counter of a telegram reaches zero.
- B.Whenever a line has fewer than 240 devices.
- C.Only when RF segments are present in the installation.
- D.When telegrams are sent out simultaneously from all lines into one single line.
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
D — When telegrams are sent out simultaneously from all lines into one single line.
Learning tip
Correct: the source says Ethernet's higher speed will not help when all lines send telegrams simultaneously into one single line.
Source: KNX Basic Course Documentation — 20 — p. 86
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Q28
Before segment couplers, what was the maximum number of small TP islands that could be connected via an IP backbone (the 'hotel scenario')?
- A.240
- B.225
- C.256
- D.255
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
A — 240
Learning tip
Correct: the source gives a maximum of 240 TP islands (225 + 15).
Source: KNX Basic Course Documentation — 21.1 — p. 87
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Q29
Why were segment couplers needed for adding a few RF devices to a TP installation, especially an existing one?
- A.RF devices cannot coexist with TP devices under any circumstances.
- B.RF devices require their own area with its own backbone coupler.
- C.Previously the media coupler had to be installed in the main line, but a single-line installation (e.g. 1.1) has no main line - so a way to branch a TP line off for RF devices was needed.
- D.The routing counter must be reset for RF telegrams.
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
C — Previously the media coupler had to be installed in the main line, but a single-line installation (e.g. 1.1) has no main line - so a way to branch a TP line off for RF devices was needed.
Learning tip
Correct: without a main line (as in a single line 1.1), the old media coupler had nowhere to go, so branching a TP line for RF devices became necessary.
Source: KNX Basic Course Documentation — 21.1 — p. 87
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Q30
Which statement about filtering between the segments of a line is correct?
- A.TP line repeaters filter between segments, so segment couplers were unnecessary.
- B.Neither repeaters nor segment couplers can filter within a line.
- C.Filtering between segments only works over an IP backbone.
- D.Segment couplers introduce filtering between different segments of a line, which does not exist with TP line repeaters.
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
D — Segment couplers introduce filtering between different segments of a line, which does not exist with TP line repeaters.
Learning tip
Correct: providing inter-segment filtering - absent in TP repeaters - was one reason for segment couplers.
Source: KNX Basic Course Documentation — 21.1 — p. 87
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Q31
Into how many subsegments (besides the main segment) can TP line repeaters physically subdivide a line?
- A.Up to three
- B.Any number
- C.Up to seven
- D.Exactly one
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
A — Up to three
Learning tip
Correct: TP repeaters allow a main segment plus up to three subsegments.
Source: KNX Basic Course Documentation — 21.2 — p. 87
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Q32
What is a limitation of TP line repeaters compared with segment couplers?
- A.They filter group addresses but not individual addresses.
- B.They are unaware which device address is in which subsegment and have no filter table, so they forward all traffic.
- C.They can only be used on RF media.
- D.They limit a line to 240 devices.
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
B — They are unaware which device address is in which subsegment and have no filter table, so they forward all traffic.
Learning tip
Correct: repeaters cannot tell where an address lives and have no filter table, so every telegram reaches every segment.
Source: KNX Basic Course Documentation — 21.2 — p. 87
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Q33
From which ETS version was the concept of segment couplers introduced?
- A.ETS4
- B.ETS5
- C.ETS6
- D.ETS3
3. KNX Topology· ip-and-segment-coupler· Easy
▸
Correct answer
C — ETS6
Learning tip
Correct: the concept of segment couplers was introduced in ETS6.
Source: KNX Basic Course Documentation — 21.2 — p. 87
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Q34
How many main segments does a line have when using segment couplers?
- A.Up to three
- B.Any number
- C.One per subsegment
- D.Exactly one
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
D — Exactly one
Learning tip
Correct: each line has exactly one main segment (plus any number of subsegments).
Source: KNX Basic Course Documentation — 21.2 — p. 87
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Q35
Device 1.1.44 is an RF device sitting in an RF subsegment behind a TP-RF segment coupler on a TP main segment. What does this show?
- A.A subsegment may use a different medium (RF) than its main segment (TP).
- B.Individual addresses encode the transmission medium.
- C.An RF device must always have device address 0.
- D.The main segment must also be converted to RF.
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
A — A subsegment may use a different medium (RF) than its main segment (TP).
Learning tip
Correct: subsegments can be a different medium type; an RF subsegment can be coupled to a TP main segment.
Source: KNX Basic Course Documentation — 21.2 — p. 87
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Q36
Regardless of how many subsegments it contains, the maximum number of devices in a single line (including all couplers) is:
- A.240
- B.255
- C.225
- D.256
3. KNX Topology· ip-and-segment-coupler· Medium
▸
Correct answer
D — 256
Learning tip
Correct: a line may hold no more than 256 devices in total, including all couplers.
Source: KNX Basic Course Documentation — 21.2 — p. 88
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Q37
What characterises an internal line telegram?
- A.It is always forwarded onto the main line by the line coupler.
- B.It is a telegram sent with routing counter 7 by a service device.
- C.Sender and destination devices are on the same line, so the telegram is not routed to another line.
- D.It travels via the backbone line to reach devices in other areas.
3. KNX Topology· telegram-routing· Easy
▸
Correct answer
C — Sender and destination devices are on the same line, so the telegram is not routed to another line.
Learning tip
Correct: For an internal line telegram both devices belong to the same line, so the line coupler has no reason to forward it.
Source: KNX Basic Course Documentation — 3.11 — p. 75
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Q38
A telegram is transmitted on a line. Which devices execute the command it carries?
- A.Every device on the line, because all of them receive the telegram.
- B.Only the line coupler of that line.
- C.Only the device that sent the telegram.
- D.Only the devices whose parameters contain the matching group address.
3. KNX Topology· telegram-routing· Medium
▸
Correct answer
D — Only the devices whose parameters contain the matching group address.
Learning tip
Correct: All devices listen in, but only those with the same group address as the telegram execute the command.
Source: KNX Basic Course Documentation — 3.11 — p. 75
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Q39
What must happen for a telegram to reach a device located on a different line of the same area?
- A.It travels directly from one line to the other without any coupler.
- B.It must be transmitted via the main line, routed by the line couplers of both lines.
- C.It must always be routed over the backbone line.
- D.It must be resent manually because lines cannot exchange telegrams.
3. KNX Topology· telegram-routing· Medium
▸
Correct answer
B — It must be transmitted via the main line, routed by the line couplers of both lines.
Learning tip
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
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Q40
Why does line coupler LC 2 route the sensor's group telegram 0/2/11 onto the main line?
- A.A line coupler forwards every telegram it receives to the main line.
- B.Because the routing counter had already reached 0.
- C.Its parameterisation (filter table) shows that devices outside line 2 respond to that group address.
- D.Because only line repeaters, not couplers, can forward telegrams.
3. KNX Topology· telegram-routing· Medium
▸
Correct answer
C — Its parameterisation (filter table) shows that devices outside line 2 respond to that group address.
Learning tip
Correct: LC 2 forwards 0/2/11 because its filter table shows external devices need it.
Source: KNX Basic Course Documentation — 3.12 — p. 76
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Q41
How can a device address bus devices located in a different area?
- A.Via the backbone line, which interconnects the areas.
- B.Via the main line only, without the backbone line.
- C.Directly, because all areas share one common line.
- D.It cannot; devices in different areas can never communicate.
3. KNX Topology· telegram-routing· Medium
▸
Correct answer
A — Via the backbone line, which interconnects the areas.
Learning tip
Correct: An area-crossing telegram uses the backbone line to move between areas.
Source: KNX Basic Course Documentation — 3.13 — p. 77
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Q42
What is the initial value of the routing counter in a telegram sent by a normal bus device?
- A.5
- B.7
- C.6
- D.0
3. KNX Topology· telegram-routing· Easy
▸
Correct answer
C — 6
Learning tip
Correct: A telegram starts with a routing counter of 6.
Source: KNX Basic Course Documentation — 3.14 — p. 78
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Q43
Which devices decrement the routing counter of a telegram?
- A.Only backbone couplers, never line couplers or repeaters.
- B.Only the sending device, once, before transmission.
- C.The receiving actuator when it executes the command.
- D.Every line-/backbone coupler and every line repeater that passes the telegram on.
3. KNX Topology· telegram-routing· Medium
▸
Correct answer
D — Every line-/backbone coupler and every line repeater that passes the telegram on.
Learning tip
Correct: Line couplers, backbone couplers and line repeaters each decrement the routing counter when forwarding.
Source: KNX Basic Course Documentation — 3.14 — p. 78
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Q44
In a modern (post-2019, TP-256) installation, what is the maximum number of bus devices that can be mounted in one line segment?
- A.256
- B.64
- C.255
- D.16
3. KNX Topology· topology-structure· Easy
▸
Correct answer
A — 256
Learning tip
Correct: the Line segment section states a maximum of 256 devices per line segment.
Source: KNX Basic Course Documentation — 3 — p. 62
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Q45
In installations planned and commissioned up to and including 2018, how many TP devices could be mounted in one line segment?
- A.256
- B.64
- C.255
- D.4
3. KNX Topology· topology-structure· Easy
▸
Correct answer
B — 64
Learning tip
Correct: up to 2018 only 64 TP devices could be mounted in one line segment.
Source: KNX Basic Course Documentation — 1 — p. 59
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Q46
What is the smallest unit in the KNX TP topology?
- A.The line
- B.The single bus device
- C.The line segment
- D.The area
3. KNX Topology· topology-structure· Easy
▸
Correct answer
C — The line segment
Learning tip
Correct: the source states the smallest unit in the TP topology is the line segment.
Source: KNX Basic Course Documentation — 3 — p. 62
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Q47
At most how many line segments can form a single line?
- A.4
- B.3
- C.15
- D.256
3. KNX Topology· topology-structure· Easy
▸
Correct answer
A — 4
Learning tip
Correct: up to 4 line segments form a line.
Source: KNX Basic Course Documentation — 1 — p. 59
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Q48
What is the maximum number of line repeaters that may be used to extend one line?
- A.15
- B.3
- C.4
- D.16
3. KNX Topology· topology-structure· Easy
▸
Correct answer
B — 3
Learning tip
Correct: a maximum of 3 line repeaters may be used to extend a line.
Source: KNX Basic Course Documentation — 1 — p. 59
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Q49
Up to what cable length can 256 devices sit in one line without needing any line repeater?
- A.4000 m
- B.100 m
- C.1000 m
- D.700 m
3. KNX Topology· topology-structure· Medium
▸
Correct answer
C — 1000 m
Learning tip
Correct: if the 256 devices fit within 1000 m of cable, no line repeater is required.
Source: KNX Basic Course Documentation — 1 — p. 59
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Q50
With the maximum of 3 line repeaters, what is the maximum TOTAL cable length of one line?
- A.1000 m
- B.3000 m
- C.4000 km
- D.4000 m
3. KNX Topology· topology-structure· Medium
▸
Correct answer
D — 4000 m
Learning tip
Correct: four 1000 m segments joined by 3 repeaters give a maximum total of 4000 m.
Source: KNX Basic Course Documentation — 1 — p. 59
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Q51
What determines whether one and the same coupler hardware acts as a line repeater, a line coupler or a backbone coupler?
- A.A physically different model for each role
- B.The loaded application program and its individual address
- C.Its physical position in the distribution board
- D.The colour of its bus terminal
3. KNX Topology· topology-structure· Medium
▸
Correct answer
B — The loaded application program and its individual address
Learning tip
Correct: the source states the loaded application and the individual address determine the role.
Source: KNX Basic Course Documentation — 1 — p. 59
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Q52
How many lines can be connected to a main line via line couplers within one area?
- A.16
- B.255
- C.15
- D.4
3. KNX Topology· topology-structure· Easy
▸
Correct answer
C — 15
Learning tip
Correct: up to 15 lines can be connected to a main line via line couplers to form an area.
Source: KNX Basic Course Documentation — 4 — p. 63
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Q53
Including the mounted line-/backbone couplers, how many bus devices can be topologically addressed on a main line?
- A.255
- B.15
- C.16
- D.256
3. KNX Topology· topology-structure· Medium
▸
Correct answer
D — 256
Learning tip
Correct: up to 256 bus devices, including the mounted couplers, can be addressed on the main line.
Source: KNX Basic Course Documentation — 4 — p. 64
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Q54
What is the maximum number of couplers (line- or backbone couplers) that a main line may carry?
- A.16
- B.256
- C.15
- D.4
3. KNX Topology· topology-structure· Medium
▸
Correct answer
A — 16
Learning tip
Correct: the source states a maximum of 16 couplers on the main line.
Source: KNX Basic Course Documentation — 4 — p. 64
View the full question page →
Q55
Approximately how many devices can be installed in one complete area?
- A.More than 250,000
- B.More than 4,000
- C.More than 61,000
- D.Exactly 256
3. KNX Topology· topology-structure· Medium
▸
Correct answer
B — More than 4,000
Learning tip
Correct: the source states more than 4,000 devices can be installed in one area.
Source: KNX Basic Course Documentation — 4 — p. 64
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Q56
How many areas can be connected to the backbone line via backbone couplers?
- A.61
- B.16
- C.15
- D.255
3. KNX Topology· topology-structure· Easy
▸
Correct answer
C — 15
Learning tip
Correct: up to 15 areas (BC 1 to BC 15) can be connected to the backbone line.
Source: KNX Basic Course Documentation — 4 — p. 65
View the full question page →

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