实验四利用wireshark分析DNS

1、word计算机网络实验报告年级： 姓名： 学号： 实验日期： 实验名称：利用wireshark分析DNS 1、 实验目的1、 学会使用nslookup工具查询并分析Internet 域名信息或诊断DNS 效劳器。学会使用ipconfig工具进行分析。2、 会用wireshark分析DNS协议。对DNS协议有个全面的学习与了解。2、 实验器材1、 接入Internet的计算机主机；2、抓包工具wireshark和截图工具snagit。三、实验内容1. Run nslookup to obtain the IP address of a Web server in Asia.the IP addr

2、ess of ：2. Run nslookup to determine the authoritative DNS servers for a university in Europe.实验结果如下列图：3. Run nslookup so that one of the DNS servers obtained in Question 2 is queried for the mail servers for Yahoo! mail. 实验结果如下列图：4. Locate the DNS query and response messages. Are then sent over UDP

3、 or TCP答：DNS query and response messages如下列图标注，They ate sent over UDP ；5. What is the destination port for the DNS query message What is the source portof DNS response message答：the destination port is： 6421164211the source port is：domain536. To what IP address is the DNS query message sent Use ipcon

4、fig to determine theIP address of your local DNS server. Are these two IP addresses the same答：ip地址99 ，这两个IP地址是一样的。试验截图如下7. Examine the DNS query message. What “Type of DNS query is it Does thequery message contain any “answers答：“Type of DNS query ishost address没有包含“answer；8. Examine the DN

5、S response message. How many “answers are provided Whatdo each of these answers contain答：“answers如下列图：9. Consider the subsequent TCP SYN packet sent by your host. Does the destinationIP address of the SYN packet correspond to any of the IP addresses provided inthe DNS response message答：10. This web

6、page contains images. Before retrieving each image, does your hostissue new DNS queries答： my hostissue dont issue new DNS queries。11. What is the destination port for the DNS query message What is the source portof DNS response message答：the destination port for the DNS query message：the source port

7、of DNS response message：他们是相同的。12. To what IP address is the DNS query message sent Is this the IP address of yourdefault local DNS serverIP address：This is the IP address of my default local DNS server13. Examine the DNS query message. What “Type of DNS query is it Does thequery message contain any

8、 “answers答：“Type of DNS query“answers：14. Examine the DNS response message. How many “answers are provided Whatdo each of these answers contain答：15. Provide a screenshot.16. To what IP address is the DNS query message sent Is this the IP address of yourdefault local DNS server他们是相同的。17. Examine the

9、DNS query message. What “Type of DNS query is it Does thequery message contain any “answers18. Examine the DNS response message. What MIT nameservers does the responsemessage provide Does this response message also provide the IP addresses of theMIT namesers答：MIT nameservers如下划线this response message

10、 dont provide the IP addresses of the MIT namesers。19. Provide a screenshot.20. To what IP address is the DNS query message sent Is this the IP address of yourdefault local DNS server If not, what does the IP address correspond toIThis is not the IP address ofmydefault local DNS server。the IP address correspond to 21. Examine the DNS query message. What “Type of DNS query is it Does thequery message contain any “answerstype如下列图：Answer如下列图：22. Examine the DNS response message. How many “answers are provided Whatdoes each of th