RCDD Test TDMMV14 2025
Questions and Answers
Which cables are immune to electromagnetic interference? - ANSWER✔✔-A) Optical
Fiber
What term describes signals transmission in both directions simultaneously? -
ANSWER✔✔-C) Full Duplex
What refers to signal interference between cable pairs? - ANSWER✔✔-A) Crosstalk
What is the characteristic impedance of Series-6 and Series-11 coaxial cables? -
ANSWER✔✔-B) 75 ohms
What is the nominal characteristic impedance of balanced twisted-pair cables at 100
MHz? - ANSWER✔✔-C) 100 ohms
What sets the standard for comparing the conductivity of metallic cabling? -
ANSWER✔✔-A) Copper
,Which optical fiber interface has an SFF design and a simplex connector that can be
converted to a duplex? - ANSWER✔✔-A) LC-style optical fiber connector
What are the two most popular core sizes in multimode optical fiber? - ANSWER✔✔-C)
62.5 μm and 50 μm
Which type of optical fiber has a small diameter with a core of 8 μm to 11 μm? -
ANSWER✔✔-A) OS2
What are the two major classifications of optical fiber? - ANSWER✔✔-A) Multimode
and singlemode
There should be a minimum of ____ telecommunications room per floor. -
ANSWER✔✔-B) 1
Multiple telecommunications rooms (TRs) are required if the cable length between the
horizontal cross-connect/floor distributor (HC/FD) and the telecommunications outlet
location, including slack, exceeds ___________. - ANSWER✔✔-D) ≈90 m (295 ft)
What is the maximum area that a single telecommunications enclosure (TE) can cover? -
ANSWER✔✔-A) ≈334 m² (3600 ft²)
Which of the following connects a telecommunications room (TR) to the work area? -
ANSWER✔✔-A) Horizontal cabling
, What is the minimum amount of space that should be allocated for the equipment room
(ER)? - ANSWER✔✔-C) ≈3 m by ≈4.9 m (10 ft by 16 ft)
The cable transitioning from the outside into the building can transition no more than
______ inside the building. - ANSWER✔✔-B) ≈15 m (50 ft)
Which of the following is an environmentally controlled centralized space for
telecommunications equipment that usually houses a main or intermediate cross-
connect? - ANSWER✔✔-A) Equipment room (ER)
Which color represents horizontal cable? - ANSWER✔✔-A) Blue
What distribution system provides a connection between telecommunications spaces? -
ANSWER✔✔-A) Backbone distribution system
Which topology can typically be seen in a campus system where some or all of the
horizontal cross-connects/floor distributors (HCs/FDs) are connected to an
intermediate cross-connect/building distributor (IC/BD), which in turn, is connected to
the main cross-connect/campus distributor (MC/CD)? - ANSWER✔✔-C) Hierarchical
star
Which layer of the OSI Reference Model is responsible for intranetwork data transfer? -
ANSWER✔✔-Layer 2, Data Link Services
Which layer of the OSI Reference Model is responsible for physical services? -
ANSWER✔✔-Layer 1, Physical Services
Questions and Answers
Which cables are immune to electromagnetic interference? - ANSWER✔✔-A) Optical
Fiber
What term describes signals transmission in both directions simultaneously? -
ANSWER✔✔-C) Full Duplex
What refers to signal interference between cable pairs? - ANSWER✔✔-A) Crosstalk
What is the characteristic impedance of Series-6 and Series-11 coaxial cables? -
ANSWER✔✔-B) 75 ohms
What is the nominal characteristic impedance of balanced twisted-pair cables at 100
MHz? - ANSWER✔✔-C) 100 ohms
What sets the standard for comparing the conductivity of metallic cabling? -
ANSWER✔✔-A) Copper
,Which optical fiber interface has an SFF design and a simplex connector that can be
converted to a duplex? - ANSWER✔✔-A) LC-style optical fiber connector
What are the two most popular core sizes in multimode optical fiber? - ANSWER✔✔-C)
62.5 μm and 50 μm
Which type of optical fiber has a small diameter with a core of 8 μm to 11 μm? -
ANSWER✔✔-A) OS2
What are the two major classifications of optical fiber? - ANSWER✔✔-A) Multimode
and singlemode
There should be a minimum of ____ telecommunications room per floor. -
ANSWER✔✔-B) 1
Multiple telecommunications rooms (TRs) are required if the cable length between the
horizontal cross-connect/floor distributor (HC/FD) and the telecommunications outlet
location, including slack, exceeds ___________. - ANSWER✔✔-D) ≈90 m (295 ft)
What is the maximum area that a single telecommunications enclosure (TE) can cover? -
ANSWER✔✔-A) ≈334 m² (3600 ft²)
Which of the following connects a telecommunications room (TR) to the work area? -
ANSWER✔✔-A) Horizontal cabling
, What is the minimum amount of space that should be allocated for the equipment room
(ER)? - ANSWER✔✔-C) ≈3 m by ≈4.9 m (10 ft by 16 ft)
The cable transitioning from the outside into the building can transition no more than
______ inside the building. - ANSWER✔✔-B) ≈15 m (50 ft)
Which of the following is an environmentally controlled centralized space for
telecommunications equipment that usually houses a main or intermediate cross-
connect? - ANSWER✔✔-A) Equipment room (ER)
Which color represents horizontal cable? - ANSWER✔✔-A) Blue
What distribution system provides a connection between telecommunications spaces? -
ANSWER✔✔-A) Backbone distribution system
Which topology can typically be seen in a campus system where some or all of the
horizontal cross-connects/floor distributors (HCs/FDs) are connected to an
intermediate cross-connect/building distributor (IC/BD), which in turn, is connected to
the main cross-connect/campus distributor (MC/CD)? - ANSWER✔✔-C) Hierarchical
star
Which layer of the OSI Reference Model is responsible for intranetwork data transfer? -
ANSWER✔✔-Layer 2, Data Link Services
Which layer of the OSI Reference Model is responsible for physical services? -
ANSWER✔✔-Layer 1, Physical Services
