desktop DNS server MAC: AA-2F-2F-2F-2F-2F IP: 3.3.3.3 MAC: CC-2F-2F-2F-2F-2F S1 3 i2 IP: 4.4.4.4 MAC: DD-2F-2F-2F-2F-2F DNS port: 53 R5 12 DNS port: 1220 HTTP port: 1530 R2 i1 1IP: 51.51.5151 il MAC: 5a2F2F2F2F2F i1 il MAC: 1A-2F2F2F2F2F 2 IP:12.12.12.12 i2 MAC: 18-2F-2F-2F-2F-2F i2 IP:52.52.52.52 i2 MAC: 5B-2F-2F-2F-2F-2F R1 1IP: 21.21.21.21 il MAC 2a2F2F2F2F2F i2 IP 22.22.22.22 i2 MAC: 28-2F-2F-2F-2F-2F 1IP: 31.31.3131 il MAC: 3a2F2F2F2F2F i2 IP:32.32.32.32 i2 MAC: 3B-2F-2F-2F-2F-2F R3 i1 i2 R4 S2 1IP: 41.41.4141 il MAC: 4A-2F2F-2F2F-2F 2 IP:42.42.42.42 web server i1 i2 IP: 2.2.2.2 MAC: BB-2F-2F-2F-2F-2F HTTP port:80 Consider the network below, where a client is using his laptop to access the intranet web site. There are two main end-so-end communications involved: . a) when requesting the IP address of the web server from the DNS server; .b)when accessing the web site. The standard server port numbers for DNS and HTTP are 53 and 80, respectively. The dlients use random port numbers, which we consider in this case are 1220 for DNS and 1530 for HTTP P 3333 R2 52 Let's start with the first communication, Le. getting IP address from the DNS server. Answer the following questions based on the figure Q1. Switch Table At the beginning, all the switch tables are empty. Fill S1 switch table after each of the steps below. If the table will not change (ie. no entry will be added to the table): 1. write down "NO CHANGE in the related row, and add an explanation why. 2. Write down NONE in the last column. NOTE: At each step, consider that the previous steps have already been processed (ie. have aready occurred) a. (a1) The laptop sends an ARP request to get the MAC address of the defaut gateway. (a2) the gateway sends the reply. b. (b1) The laptop sends a DNS request to get the IP address of the web server. (b2) the DNS server replies. C. The laptop sends a message to the desktop. NOTE: if a cell is left empty, you will get zero for that cell (ie. because I dont know if it is empty because nothing is added or because you dont know the answer) Step MAC address Output interface a1 a2 b1 b2