第12题: [单项选择]What does the statement mean A. Travel is much faster and convenient now than before. B. People are now travelling much more than in old days. C. Travelling to far-away places has become very common. D. It used to take two more weeks to travel by coach than now. 参考答案:A 答案解析:It used to take a fortnight to travel from London to Edinburgh by coach. However, you can now travel
第16题: [单项选择]A类网络是很大的网络,每个A类网络中可以有(1)个网络地址。实际使用中必须把A类网络划分为子网,如果指定的子网掩码为255.255.192.0,则该网络被划分为(2)个子网。空白(2)处应选择()。 A. 128 B. 256 C. 1024 D. 2048 参考答案:C 答案解析:A类网络用第一个字节表示网络地址,最高位为0,余下的7位为真正的网络地址,而127.0.0.0网络地址有特殊的用途,A类网络地址可以支持126个网络。A类网络地址的后24位表示主机号,所以每个A类网络