21. Consider the network below. a. Show the forwarding table in router A, such that all traffic destined to host H3 is forwarded through interface 3. b. Can you write down a forwarding table in router A, such that all traffic from H1 destined to host H3 is forwarded through interface 3, while all traffic from H2 destined to host H3 is forwarded through interface 4? H1 H2 2 3 4 1 B 2 2. 2 3 H3
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- P1. Consider the network below. a. Show the forwarding table in router A, such that all traffic destined to host H3 is forwarded through interface 3. b. Can you write down a forwarding table in router A, such that all traffic from H1 destined to host H3 is forwarded through interface 3, while all traffic from H2 destined to host H3 is forwarded through interface 4? (Hint: This is a trick question.)1. Below is a nested MPLS network by MTN. With the assumption that Customer 6 (C6) is connected to Router 6 (R6), execute a Dijkstra Algorithm on a Link State routing to determine the shortest path for Customer 6 to transmit packets to every other Customer/Destination connected to the rest of the Routers on the network. (a) i. Tabulate the executed iteration for the Dijkstra Algorithm using the table below. Iteration Nodes R1 R2 R3 R4 R5 R7 R8 R9 R10 0 [6] 1 [6,3] 2 [6,3,2] 3 [6,3,2,1] 4 [6,3,2,1,4] 5 [6,3,2,1,4,5] 6 [6,3,2,1,4,5,7]…55. The problem with unicast delivery is that the : a. memory allocation is difficult b. server must establish a seperate unicast session for each client c. the routers must support unicasting d. the clients must be close to the server
- 22. A datagram subnet allows routers to drop packets whenever they need to. The probability of a router discarding a packet is p. Consider the case of a source host connected to the source router, which is connected to the destination router, and then to the destination host. If either of the routers discards a packet, the source host eventually times out and tries again. If both host-router and router-router lines are counted as hops, what is the mean number of a. (a) hops a packet makes per transmission? b. (b) transmissions a packet makes? (c) hops required per received packet?22. A datagram subnet allows routers to drop packets whenever they need to. The probability of a router discarding a packet is p. Consider the case of a source host connected to the source router, which is connected to the destination router, and then to the destination host. If either of the routers discards a packet, the source host eventually times out and tries again. If both host-router and router-router lines are counted as hops, what is the mean number of a. (a) hops a packet makes per transmission? b. (b) transmissions a packet makes? c. (c) hops required per received packet?Below is a nested MPLS network by MTN. With the assumption that Customer 6 (C6) is connected to Router 6 (R6), execute a Dijkstra Algorithm on a Link State routing to determine the shortest path for Customer 6 to transmit packets to every other Customer/Destination connected to the rest of the Routers on the network. Tabulate the executed iteration for the Dijkstra Algorithm using the table below. Iteration Nodes R1 R2 R3 R4 R5 R7 R8 R9 R10 0 [6] 1 [6,3] 2 [6,3,2] 3 [6,3,2,1] 4 [6,3,2,1,4] 5 [6,3,2,1,4,5] 6 [6,3,2,1,4,5,7]…
- Below is a nested MPLS network by MTN. With the assumption that Customer 6 (C6) is connected to Router 6 (R6), execute a Dijkstra Algorithm on a Link State routing to determine the shortest path for Customer 6 to transmit packets to every other Customer/Destination connected to the rest of the Routers on the network. Tabulate the executed iteration for the Dijkstra Algorithm using the table below. Iteration Nodes R1 R2 R3 R4 R5 R7 R8 R9 R10 0 [6] 1 [6,3] 2 [6,3,2] 3 [6,3,2,1] 4 [6,3,2,1,4] 5 [6,3,2,1,4,5] 6 [6,3,2,1,4,5,7]…A router has the following four active flows, and each flow has packets to transmit. Given FQ is being used on the router, what is the order that the packets will be transmitted?We have 5 routers labled A-E. Suppose we have the forwarding tables shown below after the routingalgorithm is stable. Let all links have cost 1. a. If a message is originated from A and a destination is E. Which path does it take?b. If a message is originated from C and a destination is D. Which path does it take?c. Give a diagram of a possible network consistent with these tables.
- (a) Where might a datagram be queued inside a router to wait for further processing? (b) How does the head-of-the-line blocking occur?Consider the network shown below, and Dijkstra’s link-state algorithm. Suppose that Dijkstra's algorithm has been run to compute the least cost paths from node E to all other nodes. Now suppose that source node E has a packet to send to destination node A. What is the first router to which E will forward this packet on its path to A?Consider a computer 1 that communicates with a computer 2 via LAN1, router R1, and LAN2. The sending computer1 is running two processes at this time with port addresses k and l. The receiving computer 2 is running three processes at this time with port addresses f, g and h. Process k in the sending computer 1 needs to communicate with process g in the receiving computer 2. Draw the network and show the contents of segments, packets and frames at the network, data link, and transport layer for each hop. Note: Computer 1 has: Physical address=15, Logical address=A Router R1 has: Physical address in the side of LAN 1=20, Logical address in the side of LAN1=B Physical address in the side of LAN 2=50, Logical address in the side of LAN2=D. Computer 2 has: Physical address=77, Logical address=E.