NCTI PROFESSIONAL PREP QUESTIONS
AND ACCURATE ANSWERS GRADED A+
●● What is one reason why broadband cable operators install fiber-optic
cable in stages instead of changing the infrastructure all at once?
Answer: Changing the infrastructure all at once would cause too many
service disruptions.
●● What is the difference between the fiber-to-the-node (FTTN) and
fiber-to-the-curb (FTTC) topologies?
Answer: An FTTC is allowed a smaller number of RF amplifiers
between the optical fiber and the customer premises.
●● Which of these components is used in a passive optical network
(PON)?
Answer: Optical splitters.
●● Which type of star topology used in a passive optical network (PON)
places the PON splitters into fiber access terminal (FAT) located deep in
the network and closer to the customer premises than the centralized
split?
Answer: Distributed star.
,●● Which element of a passive optical network (PON) uses a Bragg
grating filter?
Answer: Optical line terminal (OLT).
●● Which element of a passive optical network (PON) uses patch
panels?
Answer: Optical distribution network (ODN).
●● What is it about radio frequency over glass (RFoG) that made
broadband cable operators envision using it to make a seamless
transition from the legacy hybrid fiber/coax (HFC) architecture over to a
gigabit-capable passive optical network (GPON) or Ethernet passive
optical network (EPON)?
Answer: RFoG can operate in parallel with GPON or EPON, which
eliminates the need for any downtime during the transition.
●● How are optical splitters used in the forward path?
Answer: In the forward path, optical splitters are used as passive
branching devices that divide an optical signal across multiple output
fibers.
●● Which of the following describes a fiber pigtail?
Answer: Fiber-optic cable with pre-connectorized ends.
,●● Heat shrink tubing is installed over the fusion-splice to strengthen
and protect it. When should the heat shrink be installed on the fiber?
Answer: Before stripping the plastic coating from the fiber.
●● Which of the following are statements of true axioms?
Answer: When A = C and B = C, then A = B because both are equal to
C, which supports the axiom: Quantities equal to the same quantity are
equal to each other.
●● Simplify and solve the equation: If E = IR then I = ?
Answer: E/R
●● The square of 7 =
Answer: 49
●● The square root of 81 =
Answer: 9
●● 0.00004 = ______ x 10 to the power of ______.
Answer: 4, -5
●● (75 x 10 to the power of 3) + (25 x 10 to the power of 4) =
Answer: 32.5 x 10 to the power of 4
, ●● 10 to the power of -3 has a metric prefix of ______.
Answer: Milli
●● (480 x 10 to the power of -5) divided by (60 x 10 to the power of -3)
=
Answer: 8 x 10 to the power of -2
●● (250 x 10 to the power of -6) - (7 x 10 to the power of -5) =
Answer: 180 x 10 to the power of -6
●● (75 × 103) + (25 × 104) =
Answer: (*Wrong) 100 × 10^3
●● (-25) + (42) + (-62) + (20) =
Answer: -25
●● (17) x (-19) =
Answer: -323
●● (-17) - (-34) =
Answer: 17
AND ACCURATE ANSWERS GRADED A+
●● What is one reason why broadband cable operators install fiber-optic
cable in stages instead of changing the infrastructure all at once?
Answer: Changing the infrastructure all at once would cause too many
service disruptions.
●● What is the difference between the fiber-to-the-node (FTTN) and
fiber-to-the-curb (FTTC) topologies?
Answer: An FTTC is allowed a smaller number of RF amplifiers
between the optical fiber and the customer premises.
●● Which of these components is used in a passive optical network
(PON)?
Answer: Optical splitters.
●● Which type of star topology used in a passive optical network (PON)
places the PON splitters into fiber access terminal (FAT) located deep in
the network and closer to the customer premises than the centralized
split?
Answer: Distributed star.
,●● Which element of a passive optical network (PON) uses a Bragg
grating filter?
Answer: Optical line terminal (OLT).
●● Which element of a passive optical network (PON) uses patch
panels?
Answer: Optical distribution network (ODN).
●● What is it about radio frequency over glass (RFoG) that made
broadband cable operators envision using it to make a seamless
transition from the legacy hybrid fiber/coax (HFC) architecture over to a
gigabit-capable passive optical network (GPON) or Ethernet passive
optical network (EPON)?
Answer: RFoG can operate in parallel with GPON or EPON, which
eliminates the need for any downtime during the transition.
●● How are optical splitters used in the forward path?
Answer: In the forward path, optical splitters are used as passive
branching devices that divide an optical signal across multiple output
fibers.
●● Which of the following describes a fiber pigtail?
Answer: Fiber-optic cable with pre-connectorized ends.
,●● Heat shrink tubing is installed over the fusion-splice to strengthen
and protect it. When should the heat shrink be installed on the fiber?
Answer: Before stripping the plastic coating from the fiber.
●● Which of the following are statements of true axioms?
Answer: When A = C and B = C, then A = B because both are equal to
C, which supports the axiom: Quantities equal to the same quantity are
equal to each other.
●● Simplify and solve the equation: If E = IR then I = ?
Answer: E/R
●● The square of 7 =
Answer: 49
●● The square root of 81 =
Answer: 9
●● 0.00004 = ______ x 10 to the power of ______.
Answer: 4, -5
●● (75 x 10 to the power of 3) + (25 x 10 to the power of 4) =
Answer: 32.5 x 10 to the power of 4
, ●● 10 to the power of -3 has a metric prefix of ______.
Answer: Milli
●● (480 x 10 to the power of -5) divided by (60 x 10 to the power of -3)
=
Answer: 8 x 10 to the power of -2
●● (250 x 10 to the power of -6) - (7 x 10 to the power of -5) =
Answer: 180 x 10 to the power of -6
●● (75 × 103) + (25 × 104) =
Answer: (*Wrong) 100 × 10^3
●● (-25) + (42) + (-62) + (20) =
Answer: -25
●● (17) x (-19) =
Answer: -323
●● (-17) - (-34) =
Answer: 17
