1、計算機網(wǎng)絡實驗報告年級： 姓名： 學號： 實驗日期： 實驗名稱：利用wireshark分析DNS 1、 實驗目的1、 學會使用nslookup工具查詢并分析Internet 域名信息或診斷DNS 服務器。學會使用ipconfig工具進行分析。2、 會用wireshark分析DNS協(xié)議。對DNS協(xié)議有個全面的學習與了解。2、 實驗器材1、 接入Internet的計算機主機；2、抓包工具wireshark和截圖工具snagit。三、實驗內容1. Run nslookup to obtain the IP address of a Web server in Asia.the IP address

2、of ：2. Run nslookup to determine the authoritative DNS servers for a university in Europe.實驗結果如下圖：3. Run nslookup so that one of the DNS servers obtained in Question 2 is queried for the mail servers for Yahoo! mail. 實驗結果如下圖：4. Locate the DNS query and response messages. Are then sent over UDP or TC

3、P?答：DNS query and response messages如下圖標注，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： 64211（64211）the source port is：domain（53）6. To what IP address is the DNS query message sent? Use ipco

4、nfig to determine theIP address of your local DNS server. Are these two IP addresses the same?答：ip地址99 ，這兩個IP地址是一樣的。試驗截圖如下7. Examine the DNS query message. What “Type” of DNS query is it? Does thequery message contain any “answers”?答：“Type” of DNS query is（host address）沒有包含“answer”；8. Exam

5、ine the DNS response message. How many “answers” are provided? Whatdo each of these answers contain?答：“answers”如下圖：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

6、：10. This web 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

7、：the source port of DNS response message：他們是相同的。12. To what IP address is the DNS query message sent? Is this the IP address of yourdefault local DNS server?IP address：This is the IP address of my default local DNS server（）13. Examine the DNS query message. What “Type” of DNS query is it? Does thequ

8、ery message contain any “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 DN

9、S server?他們是相同的。17. Examine the DNS query message. What “Type” of DNS query is it? Does thequery message contain any “answers”?18. 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：MI

10、T nameservers如下劃線this response message 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 to?IThis 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 “answers”?type如下圖：Answer如下圖：22. Examine the DNS response message. How many “answers” are provided? Whatdoes each of