If a router’s serial interface was not receiving clocking, what would the interface status and protocol state be?<br>A. Status up Protocol up<br>B. Status administratively-down Protocol up<br>C. Status up Protocol Down<br>D. Status Down Protocol Down<br>这到题是 C还是 D<br>which two low cost tools can be used to determine cable continuity?(choose two)<br>A TDR<br>B OTDR<br>C VOLT-OHM METER<br>D DIGITAL-MULTI METER<br>E PROTOCOL ANALYZER<br><br>这个题我不知道该选什么?书上没找到<br>请教高手!!!!<br>谢谢了<br>