问题 21
Which of the following interconnects the PBB to the SBB?

问题 22
Which of the following refers to a set of rules issued by a governmental body at the state level within the US?

问题 23
What type of coaxial cable is used for video backbone distribution?

问题 24
在改造过程中，安装人员发现了他们认为可能含有石棉的旧隔热材料，他们无法在不破坏隔热材料的情况下完成工作。施工人员最好采取什么行动？

问题 25
What is the maximum permissible amount of untwisting for category 5e cable and higher?

问题 26
What is the maximum pull force for four-strand optical fiber?

问题 27
Which of the following is a floor serving space that serves as a point of termination for horizontal and backbone cables?

问题 28
A grey backboard should be used to identify _____ backbone cable?

问题 29
Which of the following tools is a low-cost cable verifier that can be used to test for opens, shorts, crossed pairs, and miswires in 4- pair cables?

问题 30
Which of the following should be used to prevent the cable from twisting during a horizontal backbone pull?

问题 31
Which of the following components is used to bond the electrical system’s grounding electrode system to the PBB?

问题 32
多模光纤中不同的光路长度会导致以下哪种结果？

问题 33
光缆静止时的弯曲半径要求是多少？

问题 34
Which phase of testing includes documenting the test results?

问题 35
以下哪项是使用壁挂式机架和机柜取代传统设备机架的主要好处？

问题 36
Which type of tester includes a set of modular plugs?

问题 37
A third 90-degree bend may be permitted in a conduit run if the run does NOT exceed ______?

问题 38
Which topology uses a linear configuration that places all network devices on one length of cable?

问题 39
A third 90-degree bend may be permitted in a conduit run if one of the bends is located within ____ of the cable feed end?

问题 40
Which of the following describes a nonmechanical firestop system that forms a hard char when exposed to flame?

问题 41
What is the most appropriate administration class for an infrastructure with multiple telecommunications spaces within one building?

问题 42
Which of the following fire ratings refers to the time period that a fire-rated assembly can resist flame passage?