- A.服务器A的IP地址是广播地址
- B.工作站B的IP地址是网络地址
- C.工作站B与网关不属于同一子网
- D.服务器A与网关不属于同一子网
正确答案及解析
正确答案
解析
本题考查 IP 地址知识点。知道了网络中任何一个IP地址和子网掩码可唯一确定当前网络。题中 ServerA 的 IP 参数中的“ /27 ”表示此 ServerA 所处网络的子网掩码为27位，即IP地址131.1.123.24 中前3个8 位组和第 4 个 8 位组中的前 3 位为网络标志位（ 8+8+8+3=27 ），第4个8位组中的后5位为主机位。将IP地址 131.1.123.24 展开点分二进制为 10000011.00000001.01111011.00011000（前27位为网络标志位，后5 位为主机位）。网络标志位不变，而网络主机位从全 0 变化到全 1 得 ServerA 所处网络的IP地址范围： 10000011.00000001.01111011.00000000~10000011.00000001.01111011.000111 ，即 131.1.123.0 ～ 131.1.123.31 。给一个网络设备配置的网关地址应该与当前设备的 IP 地址在同一个网络中，此设备才能正常连网，而 ServerA 的网关地址为 131.1.123.33 ，不在 ServerA 所属的网络中，所以 ServerA 通往外部网络的数据包压根就传送不出当前网络， ServerB 也即不能与 ServerA 通信。根据以上原理可确定 ServerB 所处网络的 IP 地址范围为： 10000011.00000001.01111011.00100000~10000011.00000001.01111011.00 111111 。即 131.1.123.32 ～ 131.1.123.63 ，容易看出 ServerB 的 IP 地址 131.1.123.43 ，与其网关地址 131.1.123.33 都属于同一个网络，配置无错误。通过以上分析，本题选择 D 选项。
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