computer network cache question please explain step by step iam a beginner

Using a Web browser, you visit the web site for www.hamburger.com. The base HTML page for the main page www.hamburger.com is 30,000 bits. Once the base HTML page is fetched, it contains URL references for the following embedded images: http://www.hamburger.com/burger banner.jpg 15,000 bits http://www.hamburger.com/lettuce.jpg 5,000 bits http://www.hamburger.com/mmm bacon.jpg 10,000 bits http://www.hamburger:com/veggie.jpg 10,000 bits http://www.hamburger:com/disclaimer.txt 5,000 bits http://www.hamburger.com/royale with cheese.jpg 35,000 bits Your Web browser uses the HTTP protocol to download the base page and the embedded objects. Make the following assumptions: - At most 10,000 bits of data fits into a single packet. You can ignore the overhead of any headers or framing. - You must first download the entire base page before you can start fetching the embedded images. - HTTP requests are 1,000 bits in size. - Any new connection to a machine requires a connection-establishment handshake. - For this problem, you do not need to worry about closing connections, and you can ignore the delay introduced in acknowledging the final data packet sent by the server to your browser. - All senders use windows of 20,000 bits. - No packets are lost. a. For the initial transfer of the home page, how many RTTs are required, and what occurs during each of them? b. How quickly (in terms of RTTs) can your browser download the base page for www.hamburger.com and all embedded objects if the browser uses: i. One connection per item, with up to 4 concurrent connections. ii. A single persistent, non-pipelined connection