工程师利用测试设备对某信息点己经连接好的网线进行测试时，发现有4根线不通，但计算机仍然能利用该网线连接上网。则不通的4根线是（ ）。某些交换机级联时，需要交换UTP一端的线序，其规则是（在此空作答）。
- A.1＜-->2，3＜-->4
- B.1＜-->2，3＜-->6
- C.1＜-->3，2＜-->6
- D.5＜-->6，7＜-->8
正确答案及解析
正确答案
解析
根据相关标准，10Mbps以太网只使用四根线，UTP电缆中的1-2-3-6四个线是必须的，分别配对成发送和接收信道。具体规定为：1、2线用于发送，3、6线用于接收。但百兆以太网、千兆以太网需要使用全部8根线。 当需要交换线序时，将线的其中一端的1＜-->3，2＜-->6分别对调。 对变更了线序的UTP进行测试时，最简单的方法是利用万用表测试。
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