Sol24 - CHAPTER 24 Congestion Control and Quality of...

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1 CHAPTER 24 Congestion Control and Quality of Service Solutions to Review Questions and Exercises Review Questions 1. In congestion control , the load on a network is prevented from exceeding the capacity. Quality of service refers to the characteristics that a flow of data seeks to attain. If there is good congestion control, then the QoS is also good and vice versa. 2. A traffic descriptor is a qualitative value that describes a data flow. 3. The average data rate is always less than or equal to the peak data rate . 4. The data rate of bursty data changes suddenly in a very short period of time. 5. Open-loop congestion control policies try to prevent congestion. Closed-loop con- gestion control policies try to alleviate the effects of congestion. 6. The following policies can help to prevent congestion: a good retransmission pol- icy , use of the selective-repeat window , a good acknowledgment policy , a good discard policy , and a good admissions policy . 7. Congestion can be alleviated by back pressure , a choke point , and explicit signal- ing . 8. The TCP send window size is determined by the receiver and by the congestion on the network . 9. Frame Relay uses the BECN bit and the FECN bit to control congestion. 10.
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This homework help was uploaded on 04/18/2008 for the course JAVA CDA 4506 taught by Professor Eisler during the Spring '08 term at University of Central Florida.

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Sol24 - CHAPTER 24 Congestion Control and Quality of...

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