# 域名系统DNS

![image-20201024000627823](计算机网络第6章习题课.assets/image-20201024000627823.png)

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![image-20201024002135210](计算机网络第6章习题课.assets/image-20201024002135210.png)



# 文件传送协议FTP

![image-20201024135242632](计算机网络第6章习题课.assets/image-20201024135242632.png)

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![image-20201024135740064](计算机网络第6章习题课.assets/image-20201024135740064.png)



# 电子邮件

![image-20201024154357384](计算机网络第6章习题课.assets/image-20201024154357384.png)

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![image-20201024154637025](计算机网络第6章习题课.assets/image-20201024154637025.png)

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![image-20201024154704101](计算机网络第6章习题课.assets/image-20201024154704101.png)



# 超文本传输协议HTTP

![image-20201024230522020](计算机网络第6章习题课.assets/image-20201024230522020.png)

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![image-20201024230846111](计算机网络第6章习题课.assets/image-20201024230846111.png)