1.You are troubleshooting a stereo system with two speakers, but initially only one produces sound. After swapping the speaker positions, both work correctly. What does this suggest as the most likely ca 1.您正在排除一个双扬声器立体声系统的故障，但最初只有一个扬声器发出声音。更换扬声器位置后，两个扬声器都能正常工作。这表明最可能的原因是什么？

A. The amplifier or receiver had a faulty channel that corrected itself A. 放大器或接收器有一个故障通道，但故障已自行修复

B. A loose or misconnected cable at the original non-working speaker B. 原先不工作的扬声器处的电缆松动或连接错误

C. The speaker itself was defective C. 扬声器本身有缺陷

D. Room acoustics caused sound cancellation D. 房间声学特性导致声音抵消

2.In a 25-line telephone system, 19 lines are active and two lines show crosstalk. What is the proper first troubleshooting step? 2.在一个25线电话系统中，有19条线路正在使用，其中两条线路出现串扰。正确的第一个故障排除步骤是什么？

A. Replace the full 25-pair cable backbone A. 更换整条25对电缆主干线

B. Locate the affected pairs and re-terminate them maintaining proper twists and separation B. 找到受影响的线对并重新端接，保持正确的绞合和间距

C. Advise the user to upgrade their phones C. 建议用户升级他们的电话

D. Temporarily ground the problem lines to reduce interference D. 暂时将故障线路接地以减少干扰

3.After wiring a multi-bulb lighting fixture, the installer finds that the final lamp in the series does not illuminate. What is the most likely cause? 3.布线多灯照明灯具后，安装人员发现串联的最后一个灯泡不亮。最可能的原因是什么？

A. A defective bulb A. 灯泡有缺陷

B. Loss of power at the source B. 电源中断

C. Insufficient voltage C. 电压不足

D. Excessive current D. 电流过大

4.While installing a new firewall, the LAN interface connected to a managed switch fails to authenticate. What is the most probable reason? 4.安装新防火墙时，连接到受管交换机的 LAN 接口无法进行身份验证。最可能的原因是什么？

A. The patch cord is defective or incorrectly terminated A. 跳线故障或端接不正确

B. A shielded Cat6 cable is mandatory for this connection B. 此连接必须使用屏蔽式 Cat6 网线

C. A configuration mismatch exists on the firewall or switch C. 防火墙或交换机上存在配置不匹配

D. Port security must be disabled on the switch D. 必须在交换机上禁用端口安全功能

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