a. A host has been assigned the following IP address and mask: 192.169.45.161 /20. Find the network address (Fill in the blanks in the table: 30 points). IP Address in Binary Mask in Binary Network address in Binary Network address in Decimal 11000000 192. b. How many usable hosts can you get from this IP address and mask: 192.169.45.161/20 (5 points) c. A new shopping mall has obtained an IPv4 network address, 205.72.16.0/24. Management of the shopping mall would like to create 6 subnets, with each subnet serving 32 hosts. Could it be done? Demonstrate the reason with numbers (5 pionts). 2. The following packets have arrived at a router: Arriving Packet 1: Arriving Packet 2: Arriving Packet 3: This routing table shows this router's current routing table content. Find the next-hop router for each arriving packet using the 3-step routing decision rules. Explain your reasoning (30 points). Row 1 2 3 4 5 6 7 8 9 Destination IP Address 174.16.9.35 Destination IP Address 104.156.5.44 Destination IP Address 72.116.19.212 10 11 12 13 14 15 16 17 72.116.18.0 18 116.72.59.0 19 72.116.20.0 20 104.156.5.0 21 0.0.0.0 174.16.9.35 Destination IP of Arriving Packet 104.156.5.44 Destination Network 120.15.179.0 140.186.35.0 174.16.9.0 68.5.44.0 64.16.0.0 197.14.0.0 167.94.35.0 194.0.0.0 104.156.0.0 196.5.0.0 64.16.0.0 72.116.19.212 104.156.5.0 194.59.0.0 174.16.0.0 194.59.72.0 197.14.0.0 Routing Table Mask All Rows that Match 255.255.255.0 (/24) 255.255.255.0 (/24) 255.255.255.0 (24) 255.255.255.0 (/24) 255.255.0.0 (/16) 255.255.0.0 (/16) 255.255.255.0 (/24) 255.0.0.0 (8) 255.255.0.0 (/16) 255.255.0.0 (/16) 255.255.0.0 (/16) 255.255.255.0 (24) 255.255.0.0 (/16) 255.255.0.0 (/16) 255.255.255.0 (24) 255.255.0.0 (/16) 255.255.255.0 (24) 255.255.255.0 (24) 255.255.255.0 (24) 255.255.255.0 (24) 0.0.0.0 (/0) Metric (Hop Next-Hop Count) Router Local A C A C D B E A C Row Next Hop Selected Router -- 6 8 5 3 2 4 4 3 6 4 5 8 7 8 4 Note: 1. The outgoing router interface column is omitted from the table. Row 21 shows the default route. 2. 10 5 7 4 -- B A C D A A E D C B Reason 3. Determine IP and frame header information for a data packet. Client X Client X RA Interface FO RA Interface F1 RB Interface FO RB Interface F1 Server Y Source address FO RA Source address Fl Source address FO IP Address 130.158.104.6 130.158.104.27 192.32.191.11 192.32.191.12 10.5.8.11 10.5.8.167 RB Destination address The configuration in the figure above shows three networks interconnected through two routers. Client X is sending a packet to Server Y. At the data link layer, the packet is encapsulated in a frame on each of the three networks (30 points). F1 a. Record the destination/source MAC addresses and IP addresses for the frame/packet transmitted from Client X to interface FO of RA. Frame Header Destination address MAC Address 88:77:66:55:44:33 F6:E5:D4:C3:B2:A1 A1:B2:C3:D4:E5:F6 33:44:55:66:77:88 12:34:56:65:43:21 AB:CD:EF:99:88:77 Server Y IP Packet Header Destination address Source address Frame/Packet from Client X to interface FO of RA b. Record the destination/source MAC addresses and IP addresses for the frame/packet transmitted from interface F1 of R to interface FO of RB. Frame Header IP Packet Header Source address Destination address IP Packet Header Frame/Packet from interface F1 of RA to Interface FO of RB c. Record the destination/source MAC addresses and IP addresses for the frame/packet transmitted from interface F1 of RB to Server Y. Frame Header Destination address Source address Data Destination address Frame/Packet from interface F1 of RB to Server Y Hi Data Hi Data Hi