CPCT Network Topology & Configuration 5 — Questions and Answers
Question 1: A technician is certifying a Cat 6 horizontal link and finds the insertion loss exceeds the TIA-568 limit. Which condition is MOST likely causing this?
- The cable pairs are untwisted more than 13mm at the termination
- The total cable length exceeds 90 meters for the permanent link (Correct answer)
- The cable is routed in a conduit with other low-voltage cables
- The patch panel was terminated using the T568A standard
Correct answer: The total cable length exceeds 90 meters for the permanent link
Insertion loss (attenuation) increases with cable length; exceeding the 90-meter permanent link limit is the most direct cause of excessive insertion loss.
Question 2: In a spine-leaf data center topology, which statement BEST describes the role of a leaf switch?
- It interconnects all spine switches to form the backbone
- It connects end devices (servers, storage) and uplinks only to spine switches (Correct answer)
- It provides WAN connectivity to the service provider
- It aggregates multiple spine switches into a single management domain
Correct answer: It connects end devices (servers, storage) and uplinks only to spine switches
In a spine-leaf architecture, leaf switches connect end devices and uplink exclusively to spine switches, never to other leaf switches.
Question 3: Which type of network topology test verifies end-to-end connectivity of a horizontal channel including patch cords at both ends?
- Permanent link test
- Channel test (Correct answer)
- Basic link test
- Backbone link test
Correct answer: Channel test
A channel test measures the entire end-to-end path including patch cords at both ends, while a permanent link test excludes the patch cords.
Question 4: A structured cabling design requires running backbone cable between two buildings 400 meters apart. Which cable type is the BEST choice?
- Cat 6A UTP
- Cat 5e UTP
- Single-mode fiber optic cable (Correct answer)
- Coaxial RG-6 cable
Correct answer: Single-mode fiber optic cable
Single-mode fiber optic cable supports distances well beyond 400 meters for Ethernet and is the standard choice for inter-building backbone runs of this length.
Question 5: What is the primary purpose of a telecommunications bonding backbone (TBB) in a structured cabling system?
- To provide a shared data path between floors
- To create a common bonding network for telecommunications equipment grounding (Correct answer)
- To route horizontal cabling between work areas
- To support PoE power distribution across the building
Correct answer: To create a common bonding network for telecommunications equipment grounding
The telecommunications bonding backbone (TBB) provides a low-impedance common bonding network to equalize ground potential and protect telecommunications equipment from electrical faults.
Question 6: During a network infrastructure upgrade, a technician replaces a hub with a managed switch in a star topology. Which immediate benefit does this provide?
- Increases the maximum cable length per segment to 200 meters
- Eliminates collision domains by creating a separate collision domain per port (Correct answer)
- Converts the physical topology from star to ring for redundancy
- Enables the use of coaxial backbone cabling
Correct answer: Eliminates collision domains by creating a separate collision domain per port
A managed switch creates a separate collision domain on each port, eliminating collisions between devices and dramatically improving network performance compared to a shared hub.
Question 7: According to TIA-569, what is the minimum recommended ceiling height for a telecommunications room (TR)?
- 2.1 meters (7 feet)
- 2.44 meters (8 feet) (Correct answer)
- 2.74 meters (9 feet)
- 3.05 meters (10 feet)
Correct answer: 2.44 meters (8 feet)
TIA-569 recommends a minimum clear ceiling height of 2.44 meters (8 feet) for telecommunications rooms to allow proper equipment installation and cable management.
CPCT Network Topology & Configuration 5
A technician is certifying a Cat 6 horizontal link and finds the insertion loss exceeds the TIA-568 limit.
Which condition is MOST likely causing this?