VDV Network Infrastructure 2 — Questions and Answers
Question 1: What is the maximum segment length for a 1000BASE-T Ethernet connection over Cat5e cable?
- 55 meters
- 100 meters (Correct answer)
- 150 meters
- 200 meters
Correct answer: 100 meters
1000BASE-T (Gigabit Ethernet) over Cat5e is limited to 100 meters per segment, the same as other 802.3 Ethernet variants.
Question 2: Which layer of the OSI model does a managed network switch primarily operate at?
- Layer 1 (Physical)
- Layer 2 (Data Link) (Correct answer)
- Layer 3 (Network)
- Layer 4 (Transport)
Correct answer: Layer 2 (Data Link)
Managed switches operate primarily at Layer 2, using MAC addresses to forward frames between ports within a network segment.
Question 3: In a structured cabling system, what is the function of the Intermediate Distribution Frame (IDF)?
- Connects the building to the ISP
- Serves as a satellite distribution point connecting to the MDF (Correct answer)
- Houses the main internet gateway router
- Terminates all fiber optic runs from the street
Correct answer: Serves as a satellite distribution point connecting to the MDF
An IDF serves as a satellite wiring closet that connects floor or zone cabling back to the Main Distribution Frame (MDF).
Question 4: What type of connector is used to terminate single-mode fiber optic cable in most enterprise installations?
- RJ-45
- BNC
- LC or SC (Correct answer)
- F-type
Correct answer: LC or SC
LC and SC connectors are the most commonly used fiber optic connectors in enterprise environments for both single-mode and multimode fiber.
Question 5: A VDV technician needs to run cable through a fire-rated wall. Which cable type is required?
- Plenum-rated (CMP) (Correct answer)
- Riser-rated (CMR)
- General purpose (CM)
- Direct burial (CMX)
Correct answer: Plenum-rated (CMP)
Plenum-rated (CMP) cable must be used in air-handling spaces and is also acceptable for fire-rated wall penetrations due to its low smoke and flame characteristics.
Question 6: What is the purpose of a patch panel in a network infrastructure?
- Amplifies network signals over long runs
- Provides a central termination point to organize and connect horizontal cabling (Correct answer)
- Supplies PoE power to connected devices
- Converts fiber signals to copper Ethernet
Correct answer: Provides a central termination point to organize and connect horizontal cabling
A patch panel provides a fixed termination point for horizontal cable runs, allowing flexible cross-connections via patch cords to active equipment.
Question 7: Which TIA/EIA standard defines the color-coded wiring scheme for 8-pin RJ-45 connectors?
- TIA-568-C.0
- TIA-568-C.2 (T568A/T568B) (Correct answer)
- TIA-569-D
- TIA-606-B
Correct answer: TIA-568-C.2 (T568A/T568B)
TIA-568-C.2 defines the T568A and T568B wiring schemes used to terminate twisted-pair cables in RJ-45 connectors and patch panels.
VDV Network Infrastructure 2
What is the maximum segment length for a 1000BASE-T Ethernet connection over Cat5e cable?