Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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![**5.03-5. Dijkstra's Algorithm (3, part 5).**
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?
[Diagram Description]
- The network diagram consists of six nodes: A, B, C, D, E, and F.
- The connections between nodes and their respective weights are:
- A to B: 3
- A to C: 4
- B to C: 8
- B to E: 10
- C to D: 4
- C to E: 2
- D to E: 4
- E to F: 2
- F to B: 4
[Multiple Choice Options]
- D
- C
- F
- B
To answer the question, one would evaluate the shortest path from node E to node A, based on the computed least cost paths from the algorithm.](https://content.bartleby.com/qna-images/question/6b67a6a2-2d8c-4553-99c2-3c44a5ebdd4f/be8d24a7-9431-46ad-991c-fee4d871cfdf/065nlmkt_processed.png)
Transcribed Image Text:**5.03-5. Dijkstra's Algorithm (3, part 5).**
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?
[Diagram Description]
- The network diagram consists of six nodes: A, B, C, D, E, and F.
- The connections between nodes and their respective weights are:
- A to B: 3
- A to C: 4
- B to C: 8
- B to E: 10
- C to D: 4
- C to E: 2
- D to E: 4
- E to F: 2
- F to B: 4
[Multiple Choice Options]
- D
- C
- F
- B
To answer the question, one would evaluate the shortest path from node E to node A, based on the computed least cost paths from the algorithm.
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- 1. Consider a path from host A to host B through a router X as follows: A- -X-B The capacity of the link AX is denoted Ra, while the capacity of the link XB is denoted Rb in units of [bits/s]. Assume that Ra Ri. Is it possible that the second packet queues at input queue of the second link? Explain. Now suppose that host A sends the second packet T seconds after sending the first packet. How large must T be to ensure no queueing before the second link? Explain.arrow_forwardConsider a packet of length L that begins at end system A and travels over three links to a destination end system. These three links are connected by two packet switches. Let d, s, and R denotes the length, propagation speed, and the transmission rate of link i, for i=1,2,3 . The packet switch delays each packet by d . Assuming no queuing delays, in terms of d, s , R, (i=1,2,3), and L, what is the total end-to-end delay for the packet? Suppose now the packet is 1,500 bytes, and the propagation speed on all three links are 3125km/sec, 10000 km/sec, and 3333km/sec respectively. The transmission rates of all three links are 2 Mbps, the packet switch processing delay is 3 msec, the length of the first link is 5,000 km, the length of the second link is 4,000 km, and the length of the last link is 1,000 km. For these values, what is the end-to-end delay? In the above problem, suppose R1=R2=R3=R and dproc=0. Further, suppose the packet switch does not store-and-forward packets but…arrow_forwardConsider 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? O C O O O LL B A 3 2 B 8 D 10 E 4 2 Farrow_forward
- Suppose A is connected to B via an intermediate router R, as in the previous problem. The A-R link is instantaneous, but the R–B link transmits only one packet each second, one at a time (so two packets take 2 seconds). Assume A sends to B using the sliding window protocol with SWS = 4. For Time = 0, 1, 2, 3, 4, state what packets arrive at and are sent from A and B. How large does the queue at R grow?arrow_forwardEach active interface of Distance vector gets frequent transmissions of the whole routing table that Distance vector maintains. The link status protocol broadcasts information about the state of a router's own connections to all other routers in the network. Each statement has two ideal examples that show how the Link state and the Distance vector may be utilized in a number of circumstances.arrow_forwardSuppose A is connected to B via an intermediate router R, as in the previous problem. The A-R link is instantaneous, but the R–B link transmits only one packet each second, one at a time (so two packets take 2 seconds). Assume A sends to B using the sliding window protocol with SWS = 4. For Time = 0, 1, 2, 3, 4, state what packets arrive at and are sent from A and B. How large does the queue at R grow?arrow_forward
- Consider a router with a full finite buffer and a packet arrival rate that exceeds the output link capacity of the router. When a new packet arrives, what will the router do? .arrow_forwardConsider the network shown in the figure below, and assume that each node initially knows the costs to each of its neighbors. If the distance-vector algorithm is used by all the routers, what would be the distance table entries at node E?arrow_forwardConsider a router that interconnects three subnets: Subnet 1, Subnet 2, and Subnet 3. Suppose all of the interfaces in each of these three subnets are required to have the prefix 223.10.128/24. Also suppose that Subnet 1 is required to support at least 50 interfaces, Subnet 2 is to support at least 100 interfaces, and Subnet 3 is to support at least 12 interfaces. Provide three network addresses (of the form a.b.c.d/x) that satisfy these constraints.arrow_forward
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