假设有两台主机,主机 A 的 IP 地址为 208.17.16.165 ,主机 B 的 IP 地址为 208.17.16.185 ,它们的子网掩码为 255.255.255.224 ,默认网关为 208.17.16.160 。试问: ( 1 )主机 A 能否和主机 B 直接通信? ( 2 )主机 B 不能和 IP 地址为 208.17.16.34 的 DNS 服务器通信,为什么?
【单选题】You have probably seen ads (广告) in newspaper or on television for mail-order companies. Perhaps a catalogue (商品目录) has been sent to you. Why do people buy things they have not seen in person? Some peo...