CompTIA Network+ N10-006 Q39

A technician has been given a list of requirements for a LAN in an older building using CAT6 cabling. Which of the following environmental conditions should be considered when deciding whether or not to use plenum-rated cables?

A. Workstation models
B. Window placement
C. Floor composition
D. Ceiling airflow condition

Correct Answer: D
Section: Network architecture

Explanation:
In a large building, the ‘plenum’ is the space between floors used to circulate air through the building. This space is also an ideal place to run computer network cabling. However, in the event of fire in the building, the network cables can be very hazardous because when they burn, the cable insulation gives off a poisonous smoke that gets circulated around the building. Furthermore, the burning cables help to spread the fire.
Plenum-rated cables are designed to be cabled through the plenum in a building. Plenum-rated cables are covered in fire-retardant plastic jacket to avoid the risk of toxic smoke being circulated around the building.