问题 单项选择题

主机A的IP地址是192.168.4.23,子网掩码为255.255.255.0,()是与主机A处于同一子网的主机IP地址。

A.192.168.4.1

B.192.168.255.0

C.255.255.255.255

D.192.168.4.255

答案

参考答案:A

解析:子网掩码又叫网络掩码,是一种用来指明一个IP地址的哪些位标识的是主机所在的子网以及哪些位标识的是主机的位掩码。通过进行IP地址与子网掩码的二进制与运算,可以将某个网络设备IP地址划分为网络号和主机号两部分。首先,根据本题中所给主机A的IP地址192.168.4.23和子网掩码255.255.255.0进行二进制与运算,可以计算得到主机A的所在网络号是192.168.4.0。然后,将选项A的IP地址192.168.4.1和子网掩码255.255.255.0进行二进制与运算,可以计算得到该主机的网络号也是192.168.4.0。因此选项A所对应的主机和主机A同在一个子网中,选项A是正确的。再将选项B的IP地址192.168.255.0和子网掩码255.255.255.0进行二进制与运算,可以计算得到该主机的网络号也是192.168.255.0。显然,选项B所对应的主机和主机A的网络号不同,它们并不在同一个子网中,因此选项B是错误的。而选项C的IP地址255.255.255.255是受限的广播地址。该地址用于配置过程中IP数据报的目的地址,此时,主机可能还不知道它所在网络的网络掩码,甚至连它的IP地址也不知道。任何情况下,路由器都不会转发目的地址为受限的广播地址的数据报,因此这样的数据报仅出现在本地网络中。因此选项C是错误的。最后,将选项D的IP地址192.168.4.255和子网掩码255.255.255.0进行二进制与运算,可以计算得到该IP地址的网络号是192.168.4.0,但其主机号为255,即为二进制全1。由于主机号全为1时表示该网络的广播地址,这是一个特殊地址,因此选项D也是错误的。根据以上内容分析可知,正确答案应选A。

单项选择题

After winning a big game, athletes are often asked how they feel. Usually athletes say how (1) it is to win this big game. On the contrary, the fact is that losing a big game, or in my case, all the games, can be even harder.
From the spectators’ point of view, last year’s basketball (2) for my high school team was nothing (3) of an embarrassment. And (4) 0 and 20 is certainly nothing to be proud of, that season had a bigger impact on me than any other. As a team captain, I knew it probably wouldn’t be the (5) year, but did I ever think we would lose every game Of course not. Since six of our top players had graduated, it was clear that we were a (n) (6) team who would struggle. The struggle began earlier than expected, (7) , as our team center was suspended (禁赛) for the season, and two key members decided to (8) for some reason. At this point, dropping out probably passed through every player’s mind, but in the end, we all stuck if out, (9) to work still harder.
Then there came a time when even our (10) and given up on us. Personally, I felt like it was (11) worthwhile giving my all. I thought, if even the coach doesn’t believe in us, why should I But just as my hope began to (12) , a teammate called a meeting. He said," Nobody thinks we are going to win, but, as teammates and friends, we (13) it to each other to go all out every game. "
It was that moment that (14) me how to be a leader. It hit me that I certainly didn’t (15) the role. As a leader you can never quit (16) the team who looks up to you. It is one (17) to be named captain, feel great and go through the motions, but it is quite another to be a real captain and make sure everyone realizes their full (18) all the time.
I am sure it is great to go through without losing and bringing home awards. But in all honesty, I (19) the fact that my team lost every game last year. It may not help me to become a better basketball player, but it already has made me a better leader, and (20)

A.matter
B.aspect
C.issue
D.thing

问答题 简答题