Command Prompt nslookup Command Prompt nslookup Command Prompt

Command Prompt: nslookup

Command Prompt: nslookup

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

Response dns. resp. addr

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. 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