Command Prompt nslookup Command Prompt nslookup Command Prompt

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Command Prompt: nslookup

Command Prompt: nslookup

Command Prompt: nslookup

Command Prompt: nslookup

Command Prompt : ipconfig • ipconfig /displaydns – Each entry shows the remaining Time

Command Prompt : ipconfig • ipconfig /displaydns – Each entry shows the remaining Time to Live (TTL) in seconds • ipconfig /flushdns – Flushing the DNS cache clears all entries and reloads the entries from the hosts file.

Query dns. qry. name

Query dns. qry. name

Response dns. resp. addr

Response dns. resp. addr

Flow Graph

Flow Graph

HTTP 封包擷取 • 1. 利用wireshark,擷取HTTP封包 • 2. 開始Brower,輸入 – (1) http: //gaia. cs. umass.

HTTP 封包擷取 • 1. 利用wireshark,擷取HTTP封包 • 2. 開始Brower,輸入 – (1) http: //gaia. cs. umass. edu/wireshark-labs/HTTPwireshark-file 1. html – (2) http: //gaia. cs. umass. edu/wireshark-labs/HTTPwireshark-file 3. html • 請依個別網址,回答下列問題 (擷取圖片做回答) – 你的Brower總共送出多少個HTTP GET request messages? – 回覆給GET request之狀態碼為多少? – 比較網址(1)與(2)的訊息傳遞,說明其不同處?

(1) http: //gaia. cs. umass. edu/wireshark-labs/HTTP-wireshark-file 1. html

(1) http: //gaia. cs. umass. edu/wireshark-labs/HTTP-wireshark-file 1. html