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 maximum allowable pair untwist at a termination point per TIA-568 for Cat6 cable?

    Answer: 13 mm (0.5 inch)

    TIA-568-C.2 limits pair untwist at terminations to 13 mm (0.5 inch) for Cat6 to maintain crosstalk performance at the connection point.

  2. Which test parameter measures the signal leakage from one pair to an adjacent pair at the same end of the cable being tested?

    Answer: NEXT (Near-End Crosstalk)

    NEXT measures the unwanted signal coupling from a transmitting pair to an adjacent pair measured at the same end of the cable, which is the most critical crosstalk parameter.

  3. In a structured cabling design, what is the maximum recommended horizontal cable run length including the patch cords?

    Answer: 90 meters for the permanent link, with total channel up to 100 meters

    TIA-568 specifies a 90-meter permanent link for horizontal cabling, with up to 10 meters allocated for patch cords and equipment cords for a 100-meter total channel.

  4. What is the primary advantage of using shielded twisted pair (STP) cable versus unshielded twisted pair (UTP) in a VDV installation?

    Answer: STP provides improved immunity to electromagnetic interference (EMI)

    The metallic shield in STP cable reduces susceptibility to external EMI sources, making it preferred in environments with heavy electrical equipment or interference.

  5. A network closet has a switch with a faulty uplink to the MDF. The technician needs to verify the fiber patch cable is good. Which test should be performed first?

    Answer: Visual inspection and optical power meter test

    Visual inspection for physical damage followed by an optical power meter test is the fastest and most practical first step to verify patch cable integrity.

  6. What does the term 'headend' refer to in a CATV or video distribution system?

    Answer: The central facility where signals are received, processed, and distributed

    The headend is the central processing facility that receives satellite, off-air, or other signals, processes them, and distributes the combined signal to subscribers.

  7. Which IEEE standard defines the specifications for Wi-Fi 6 (802.11ax) wireless networking?

    Answer: IEEE 802.11ax

    IEEE 802.11ax is the standard that defines Wi-Fi 6, featuring OFDMA, MU-MIMO improvements, and BSS Coloring for improved performance in dense environments.