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IST 220: Networking and Telecommunications, Spring 2016 Homework Assignment 3 Note: You may choose to either submit a hardcopy of your work in class,...

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IST 220: Networking and Telecommunications, Spring 2016 Homework Assignment 3 Note: This is an individual assignment. Each student needs to work on and submit his/her own assignment independently. You may choose to either submit a hardcopy of your work in class, or submit a single .doc or .pdf Fle to the corresponding Dropbox on ANGEL, but not both. Due: ±riday 4/29 (end of class). No late submission will be accepted. 1. Forwarding table computaTon (15 points). Consider the following graph representa²on of a WAN, where the number indicates the distance between two nodes. Please compute the forwarding table of node 1 using the shortest path criterion. 2. IP address assignment (15 points). Assume you are managing your company’s class B network address 158.16.0.0/16. Suppose that four departments, A, B, C, and D, request 4000, 2000, 4000, and 800 addresses, respec²vely, and in that order. ±or each of these requests, please give the address and mask (in the CIDR nota²on) of the assigned subnet which minimizes the number of IP addresses wasted. 3. Datagram forwarding (15 points). Consider the following forwarding table found in a router. Network Next Hop 40.0.0.0/8 A 167.234.0.0/16 B 167.234.128.0/2 0 C 192.4.10.0/24 D Please determine the next hop for each of the des²na²on address below. Please show the steps. a) 40.4.10.1 b) 167.234.138.2 c) 167.234.198.1 d) 192.4.10.2 4. Internetworking (40 points). Consider the following internetwork. Assume the Physical Address of NIC-A is E78D45C4±D66, of NIC-± is 7E8D4C544DBB. Assume the IP address of A is 121.22.230.2, of D is 192.5.2.2, and of ± is 188.11.135.112. Assume the distance between R1 and R2 is 90 miles,
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between R1 and R3 is 150 miles, between R2 and R3 is 80 miles. Note that the routers are interconnected using leased T3 circuits due to the long distances spanned. Assume computer A now wants to send the message “ER” to computer F. Assume the ASCII code for 'E' is 45, for 'R' is 52. Assume there are no errors during the transmission. A. How many physical networks are there? Note that leased T3 lines do not cause more networks. B. Assuming all networks use the classful IP addressing scheme. Please list all class C networks in this internetwork. C. What is the pre±x of the IP address of computer C? D. To send out the message, computer A will ±rst build the frame. Please draw the format of the frame before it is forwarded to NIC-A. Please be sure to include the Link layer header, the IP layer header, and the payload. (When drawing the frame, if you do not know the MAC address of a NIC, please use the NIC name instead.) E. A²er the frame arrives at NIC-A, what will NIC-A do? Please draw the format of the ±nal frame which will be sent out by NIC-A. F. A²er a while, NIC-C will sense the frame. What will NIC-C do? Please explain step by step. G. When NIC-11 senses the frame, what will NIC-11 do? Please explain step by step. H. Assume P-R1 receives the frame. When P-R1 receives it, P-R1 will then strip o³ the Link layer header. Why P-R1 needs to do this? I. P-R1 will then do rou´ng. Please draw the rou´ng table inside R1.
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