Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Consider the scenario in which a packet is sent from a source host to a destination host along a path that has been predetermined. Create a list of the delay components and include it in the end-to-end delay. Which of the delays is set in stone, and which ones are subject to change?
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- Take the case of transferring data from one host to another via a network with a predetermined route. Break out the total time it takes for a single packet to travel between two points. In what ways are there fixed delays, and in what ways are there varying ones?arrow_forwardPlease draw a flow diagramarrow_forwardIn modern packet-switched networks, including the Internet, the source host segments long, application-layer messages (for example, an image or a music file) into smaller packets and sends the packets into the network. The receiver then reassembles the packets back into the original message. We refer to this process as message segmentation. Figure 1.27 illustrates the end-to-end transport of a message with and without message segmentation. Consider a message that is 8. 106 bits long that is to be sent from source to destination in Figure 1.27. Suppose each link in the figure is 2 Mbps. Ignore propagation, queuing, and processing delays. a. Consider sending the message from source to destination without message segmentation. How long does it take to move the message from the source host to the first packet switch? Keeping in mind that each switch uses store-and-forward packet switching, what is the total time to move the message from source host to destination host? b. Now suppose that…arrow_forward
- Assume for the sake of this example that a packet is being sent from a source to an address at the other end of the network via the fixed route. List all the delays' varied causes as well: How many delays are roughly time-dependent and how many are roughly continuous for how long?arrow_forwardA connection that connects two hosts may transport many packets at the same time. Please break down how much time is spent on each step of the processing of a freight load for me. Should the duration of one delay be predetermined, while the other delay's time might be flexible, depending on the situation?arrow_forwardTo ensure the quality of service, especially for multiple applications, regulating the rate at which packets are sent to the network is an important strategy. The leaky bucket is just one of such mechanisms. A flow of packets is said to conform to the leaky bucket specification (r, b), where r is the average rate and b is the burst rate, if the number of packets arriving at the leaky bucket is less than r*t + b in every time interval of t. What is the implication of that? What will happen if the number of packets arriving at the leaky bucket is equal to or greater than r*t + b?arrow_forward
- Give a simple heuristic for finding two paths through a network from a given source to a given destination that can survive the loss of any communication line (assuming two such paths exist). The routers are considered reliable enough, so it is not necessary to worry about the possibility of router crashes.arrow_forward22. 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?arrow_forwardA connection that connects two hosts may transport many packets at the same time. Please provide a schedule that outlines all of the actions that need to be completed in order to successfully execute one shipment. Is it anticipated that one delay would take a certain amount of time, whilst the duration of the other delay will be subject to change depending on the circumstances?arrow_forward
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