VDV Network Infrastructure 3

Question 1

What is the minimum bend radius for a 4-pair UTP Cat6 cable during installation?

Accepted Answer

4 times the cable diameter

Answer

TIA-568 specifies a minimum bend radius of 4 times the cable's outer diameter for 4-pair UTP during and after installation.

Question 2

In a VoIP deployment over a converged network, what mechanism is used to prioritize voice traffic over data?

Accepted Answer

Quality of Service (QoS)

Answer

QoS mechanisms classify and prioritize voice packets to ensure low latency and jitter, which are critical for intelligible VoIP calls.

Question 3

A technician measures -3.5 dB insertion loss on a fiber run. What does this indicate?

Accepted Answer

Signal loss is within acceptable limits for most applications

Answer

An insertion loss of -3.5 dB is within the acceptable range for most short-distance fiber links, as budgets commonly allow up to -3 dB per connector and more for the total link.

Question 4

What does OTDR stand for and what is its primary use?

Accepted Answer

Optical Time Domain Reflectometer — locates faults and measures loss in fiber cables

Answer

An OTDR sends light pulses into fiber and analyzes reflections to locate faults, splices, and connectors, and measure distance and loss.

Question 5

Which cable category is the minimum required to support 10GBASE-T Ethernet up to 55 meters?

Accepted Answer

Cat6

Answer

Cat6 cable supports 10GBASE-T up to 55 meters, while Cat6A extends this to the full 100-meter channel length.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Network Infrastructure 3