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2412 SUMMARY o The average data rate, peak data rate, maximum burst size, and effective band width
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are qualitative values that describe a data flow A data flow can have a constant bit rate, a variable bit rate, or traffic that is bursty Congestion control refers to the mechanisms and techniques to control congestion and keep the load below capacity Delay and throughput measure the performance of a network Open-loop congestion control prevents congestion; closed-loop congestion control removes congestion
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CONGESTION CONTROL AND QUALITY OF SERVICE
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TCP avoids congestion through the use of two strategies: the combination of slow start and additive increase, and multiplicative decrease Frame Relay avoids congestion through the use of two strategies: backward explicit congestion notification (BECN) and forward explicit congestion notification (FECN) A flow can be characterized by its reliability, delay, jitter, and bandwidth Scheduling, traffic shaping, resource reservation, and admission control are techniques to improve quality of service (QoS) FIFO queuing, priority queuing, and weighted fair queuing are scheduling techniques Leaky bucket and token bucket are traffic shaping techniques Integrated Services is a flow-based QoS model designed for IP The Resource Reservation Protocol (RSVP) is a signaling protocol that helps IP create a flow and makes a resource reservation Differential Services is a class-based QoS model designed for IP Access rate, committed burst size, committed information rate, and excess burst size are attributes to control traffic in Frame Relay Quality of service in ATM is based on service classes, user-related attributes, and network-related attributes
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How are congestion control and quality of service related What is a traffic descriptor What is the relationship between the average data rate and the peak data rate What is the definition of bursty data What is the difference between open-loop congestion control and closed-loop congestion control Name the policies that can prevent congestion Name the mechanisms that can alleviate congestion What determines the sender window size in TCP How does Frame Relay control congestion What attributes can be used to describe a flow of data What are four general techniques to improve quality of service What is traffic shaping Name two methods to shape traffic What is the major difference between Integrated Services and Differentiated Services How is Resource Reservation Protocol related to Integrated Services What attributes are used for traffic control in Frame Relay In regard to quality of service, how do user-related attributes differ from networkrelated attributes in ATM
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SECTION 2413
PRACTICE SET
Exercises
17 The address field of a Frame Relay frame is 1011000000010Ill Is there any congestion in the forward direction Is there any congestion in the backward direction 18 A frame goes from A to B There is congestion in both directions Is the PECN bit set Is the BECN bit set 19 In a leaky bucket used to control liquid flow, how many gallons of liquid are left in the bucket if the output rate is 5 gal/min, there is an input burst of 100 gal/min for 12 s, and there is no input for 48 s 20 An output interface in a switch is designed using the leaky bucket algorithm to send 8000 bytes/s (tick) If the following frames are received in sequence, show the frames that are sent during each second Frames 1, 2, 3,4: 4000 bytes each Frames 5, 6, 7: 3200 bytes each Frames 8, 9: 21 A is a b 400 bytes each 2000 bytes each Frames 10, 11, 12:
user is connected to a Frame Relay network through a T-l line The granted CIR 1 Mbps with a Be of 5 million bits/5 s and Be of 1 million bits/5 s What is the access rate Can the user send data at 16 Mbps
c Can the user send data at 1 Mbps all the time Is it guaranteed that frames are never discarded in this case d Can the user send data at 12 Mbps all the time Is it guaranteed that frames are never discarded in this case If the answer is no, is it guaranteed that frames are discarded only if there is congestion e Repeat the question in part (d) for a constant rate of 14 Mbps
f What is the maximum data rate the user can use all the time without worrying about the frames being discarded
g If the user wants to take a risk, what is the maximum data rate that can be used with no chance of discarding if there is no congestion 22 In Exercise 21 the user sends data at 14 Mbps for 2 s and nothing for the next 3 s Is there a danger of discarded data if there is no congestion Is there a danger of discarded data if there is congestion 23 In ATM, if each cell takes 10 Jls to reach the destination, what is the CTD 24 An ATM network has lost 5 cells out of 10,000 and 2 are in error What is the CLR What is the CER
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