On the 10th July 2022 at 13:01:22, PC B visited the website whatanexam.com. To access the website, the local DNS server replied to PC B’s DNS request with (whatanexam.com, 100.3.40.56, A, 24), where TTL is given in hours. The local DNS server used iterative DNS lookup, with an RTT of 50 ms each, to retrieve the IP address for PC B. Next, on the 11th of July at 10:01:23, PC B visited the same website. I. Determine the total RTT for PC B to fetch the IP address on the 11th of July. After fetching the IP address, PC B sends the request to the website server (which takes 25ms to be sent) to open a non-persistent HTTP connection with the server and request 12 objects, including the base HTML page, each requiring 85ms to be downloaded. II. Calculate the total RTT required to fetch all the objects after retrieving the IP address. III. Calculate the total time PC B takes to load the webpage.
On the 10th July 2022 at 13:01:22, PC B visited the website whatanexam.com. To
access the website, the local DNS server replied to PC B’s DNS request with
(whatanexam.com, 100.3.40.56, A, 24), where TTL is given in hours. The local DNS
server used iterative DNS lookup, with an RTT of 50 ms each, to retrieve the IP address
for PC B. Next, on the 11th of July at 10:01:23, PC B visited the same website.
I. Determine the total RTT for PC B to fetch the IP address on the 11th of July.
After fetching the IP address, PC B sends the request to the website server (which takes
25ms to be sent) to open a non-persistent HTTP connection with the server and request
12 objects, including the base HTML page, each requiring 85ms to be downloaded.
II. Calculate the total RTT required to fetch all the objects after retrieving the IP
address.
III. Calculate the total time PC B takes to load the webpage.
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