<P>Which of the following IOS commands could you use to troubleshoot a router<BR>connectivity problem on an IP network? (Select all valid answers)<BR>A. show ip route<BR>B. ipconfig<BR>C. tracert<BR>D. show interfaces<BR>E. traceroute<BR>F. ping<BR>G. All of the above</P><P>这题的C 和E 怎么区别</P>