计算并填写表1。表1IP地址106.139.68.133子网掩码255.224.0

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问题填空题

计算并填写表1。

表1

IP地址	106.139.68.133
子网掩码	255.224.0.0
地址类别	(41)
网络地址	(42)
直接广播地址	(43)
子网内的第一个可用IP地址	(44)
子网内的最后一个可用IP地址	(45)

42（）

答案

参考答案：106.128.0.0

解析：

该IP地址的子网掩码为255.224.0.0，对应的二进制形式为：1111111111100000 00000000 0000000，前11位为1，则该IP地址的前11位为网络号。IP地址106.139.68.122的二进制表示法为01101010 10001011 01000100 01111010，则网络地址为01101010 10000000 00000000 00000000，即106.128.0.0。

阅读理解

Problems	Advice
1 Whatever I do, I always think about whether other people will be happy. How can I stop worrying about what they think? -- Eva, 14, Illinois	Dr. Molly's Answer 1 You should tell him about your dream and that if you work really hard, it might come true even though you start late.
2 What should I do if I had a test? I'm afraid to tell my mom because she might get angry with me and I can't play soccer, And soccer is like the world to me. -- Ashley, 12, Wisconsin	Dr. Molly's Answer 2 You'd better tell you mom the truth than for her to find out another way. When you tell her, explain why you failed the test. Ask her if she can help with your study in the future, you'll do better in your tests and may also have time to play soccer you love.
3 My dream is to be a famous basketball player like Yao Ming. My dad thinks I started too late and I'll never be able to make it. He puts me down, but I want his support(支持). What should I do？ -- Tim, 9, Texas	Dr. Molly's Answer 3 Just be yourself and try not to care about what others think. The more you think about it, the worse you will feel. Always be strong and confident(自信).