Question 4 (30 points): nbcsports.com M1/ /M2 nbcsports authoritative DNS server M8 M3 23:13 M4 M9 M5 M6 UMASS DNS server M10 Akamai content distribution server Akamai authoritative DNS server Figure 2 Most CDNs take advantage of DNS to intercept and redirect requests. Figure 2 shows an example how DNS is typically involved. Suppose a content provider, NBC SPORTS, employs the third-party CDN company, Akamai, to distribute its videos to customers. Assume a client in UMASS network visits the web page of nbcsports.com and watches a video which has the URL, http://video.nbcsports.com/ABC123. Please complete the following table to describe the process. List the application protocol and the content of each packet in Figure 2. The messages in the table should be in chronological order. The message ID does not imply the order that the message occurs. For example, M10 might not the last message in this process. Application Protocol Message Content Messages in chronological order M1 M2 HTTP | HTTP Request the web page of nbcsports.com. The content of the web page. Question 4 (30 points): nbcsports.com M1/ /M2 nbcsports authoritative DNS server M8 M3 23:13 M4 M9 M5 M6 UMASS DNS server M10 Akamai content distribution server Akamai authoritative DNS server Figure 2 Most CDNs take advantage of DNS to intercept and redirect requests. Figure 2 shows an example how DNS is typically involved. Suppose a content provider, NBC SPORTS, employs the third-party CDN company, Akamai, to distribute its videos to customers. Assume a client in UMASS network visits the web page of nbcsports.com and watches a video which has the URL, http://video.nbcsports.com/ABC123. Please complete the following table to describe the process. List the application protocol and the content of each packet in Figure 2. The messages in the table should be in chronological order. The message ID does not imply the order that the message occurs. For example, M10 might not the last message in this process. Application Protocol Message Content Messages in chronological order M1 M2 HTTP | HTTP Request the web page of nbcsports.com. The content of the web page