如图1所示，某网络中新技入交换机Switch B.交换机Switch B的各接口的接入网线后，SwitchA的GE1/0/3接口很快就会处于down状态，拔掉Switch B各接口的网线后(GE1/0/1除外），Switch A的GE1/0/3接口很快就会恢复到up状态，Switch A的GE1/0/3接口配置如图2所示，请判断造成该故障原因可能是()
- A.Switch B存在非法DHCP服务器
- B.Switch B存在环路
- C.Switch A性能太低
- D.Switch B存在病毒
正确答案及解析
正确答案
解析
Loopback Detection是一种通过周期性发送环路检测报文来检测接口、下挂网络或设备以及设备双接口间是否存在环路的单节点环路检测技术。
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