Which of the following fields in a DNS request from a recursive DNS server are supposed to be randomly generated by this recursive DNS server? The DNS ID. The destination port. The source port. The domain name.

Quèstion 23 In DNS recursive query the Local DNS server first checks the DNS root then The Local DNS server checks the DNS TLD server. The Local DNS server checks the DNS Authoritative server. B. Oc The DNS Root server forwards the request to the DNS TLD server. None of the above OD.

1. Please access any web site so you that you can capture TCP packets from an HTTP request. 2. Please expand all the fields in the header of your HTTP request packet. Take a screenshot for all the fields in the header fields of the HTTP packet. 3. Please expand all the fields in the header of the TCP packet in your HTTP request packet. Take a screenshot for all the fields in the header of the TCP packets. Please answer the following questions based on your HTTP request, and TCP packets screenshots: 1. What is the method used in your HTTP request? 2. What is the host name you visited? 3. What is the connection status in your HTTP request? 4. What are the source port and destination port, respectively? 5. What are the sequence number and acknowledgement number, respectively? 6. Which flags are set up in the captured packet? Explain what the flags mean.