咨询CCNA TK一道题

ngsjjsjrjt

<p>You are the network administrator at TestKing. TestKing has been provided with<br>the network address 165.100.27.0/24. The TestKing CEO wants to know how many<br>subnetworks this address provides, and how many hosts can be supported on each<br>subnet.<br>What would your reply be? (Choose all that apply)<br>A. One network with 254 hosts.<br>B. 254 networks with 254 hosts per network.<br>C. 65,534 networks with 255 hosts per network.<br>D. 30 networks with 64 hosts per network.<br>E. 254 networks with 65,534 per network.</p><p><font color="#ff0000">165。100。27。4是一个B类的地址，使用一组可变长的24位的掩码，那么只看第三位的，很明显只有一个网络，最后8位全是0，即主机数量。254个。所以A答案没有问题。</font></p><p><font color="#ff0000">If the address is 165.100.0.0/24 then right answer is B&nbsp; B类本地址本来只有16位，那么第三位位组8个0全是网络位了，即254个网络，254个主机。</font></p><p>Answer: A</p><p>解释说If the address is 165.100.0.0/24 then right answer is B.那是为什么呢？第三个oct是不是零有什么区别？哪为能帮我解释一下啊？谢谢！</p><p>What is the network address for a host with the IP address 201.100.5.68/28?<br>A. 201.100.5.0<br>B. 201.100.5.32<br>C. 201.100.5.64<br>D. 201.100.5.65<br>E. 201.100.5.31<br>F. 201.100.5.1<br>Answer: C</p><p>我认为答案应该是D吧？？</p><p><font color="#ff0000">这题问的是网络号，本不是网络合法的IP地址。C正确！</font></p><p>&nbsp;</p><p>&nbsp;</p><p>［此帖子已被 ngsjjsjrjt 在 2006-2-23 16:35:02 编辑过］</p><p>［此帖子已被 rainypan 在 2006-2-24 18:43:43 编辑过］</p>

chenxingchen

165.100.27.0/24这时已经是165.100.0.0的一个子网，此时问的是这个子网有几太主机，几个网络，那肯定是一个网络，254台主机。而如果问165.100.0.0/24，因为这个b类地址包含很多网络，所以网络有254个，每个网络有254台主机。