当在ZSR路由器上手动的shut down fei_1/1后， 再show interface fei_1/1， 结果是
A.fei_1/1is administratively dow， line protocol is up B.fei_l/1is down， line protocol is down C.fei_l/lis up， line protocol is down D.fei_l/lis administratively down， line protocol is down正确答案D
