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Unformatted text preview: 1 CHAPTER 24 Congestion Control and Quality of Service Solutions to Odd-Numbered 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. 3. The average data rate is always less than or equal to the peak data rate . 5. Open-loop congestion control policies try to prevent congestion. Closed-loop con- gestion control policies try to alleviate the effects of congestion. 7. Congestion can be alleviated by back pressure , a choke point , and explicit signal- ing . 9. Frame Relay uses the BECN bit and the FECN bit to control congestion. 11. Scheduling , traffic shaping , admission control , and resource reservation can improve QoS. 13. Differentiated Services was developed to handle the shortcomings of IntServ. The main processing was moved from the core of the network to the edge of the net-...
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- Winter '09
- congestion control, data rate, congestion control policies