Practice Test Geeks(VDV) Voice Data Video Technician Certified Practice Test
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Network Infrastructure Flashcards

7 cards from real VDV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Network Infrastructure flashcards as text

  1. What is the function of Spanning Tree Protocol (STP) in a switched network?

    Answer: Prevents Layer 2 switching loops by blocking redundant paths

    STP prevents broadcast storms caused by Layer 2 loops by electing a root bridge and placing redundant ports in a blocking state.

  2. A coaxial cable run in a CATV distribution system shows excessive signal loss. Which tool would best identify the fault location?

    Answer: Time Domain Reflectometer (TDR)

    A TDR sends a signal pulse down the cable and measures the time for reflections to return, identifying faults, shorts, or impedance mismatches and their distance.

  3. In a PoE installation, what is the maximum power a PoE+ (802.3at) switch port can deliver to a powered device?

    Answer: 30 watts

    PoE+ (802.3at Type 2) delivers up to 30 watts at the powered device (PD), compared to 15.4 watts for standard PoE (802.3af).

  4. What is the purpose of a demarcation point (demarc) in a building's network infrastructure?

    Answer: Separates the ISP's responsibility from the customer's internal network

    The demarc is the physical boundary where the service provider's network ends and the customer's premises wiring begins, defining ownership and maintenance responsibility.

  5. Which grounding conductor is used to bond the telecommunications equipment rack to the building's grounding system?

    Answer: Telecommunications Bonding Backbone (TBB)

    The Telecommunications Bonding Backbone (TBB) connects the telecommunications main grounding busbar (TMGB) to intermediate grounding busbars (TGB) throughout the building.

  6. What is the recommended maximum pulling tension for a 4-pair Cat6 UTP cable during installation?

    Answer: 25 lbs (110 N)

    TIA-568 limits pulling tension to 25 lbs (110 N) for 4-pair UTP to prevent stretching of the conductors or deformation of the pair geometry.

  7. A VDV technician is installing a wireless access point that requires 802.3bt (PoE++) power. What is the maximum power delivered at the device?

    Answer: 90 watts

    802.3bt Type 3 (PoE++) delivers up to 60 watts and Type 4 delivers up to 90 watts at the powered device, supporting high-power APs and other devices.