Network and Data Communications · Unit 6
Congestion Control and Traffic Management
Exam-focused notes for Congestion Control and Traffic Management (Network and Data Communications, BIT254): what the TU syllabus asks and how it has actually been tested, with 7 solved past questions from this unit.
What this unit covers
- Congestion control definition
- Open-loop congestion control
- Closed-loop congestion control
- Leaky-bucket algorithm
- Token bucket algorithm
- Acknowledgement policy
- Discarding policy
- Quality of Service
Token bucket algorithm
Write short notes on: Token Bucket SNMP [0+2.5+2.5]
--- The Token Bucket is a traffic shaping and policing algorithm used in computer networks to control the rate at which data (packets/bursts) are allowed to be transmitted into the network. - A "bucket" holds tokens, and tokens are added at a fixed rate (sa...
Full solved answer →Congestion control definition
What is Congestion Control? How can it be handled? Explain acknowledgement policy and discarding policy[10]
Congestion in a network occurs when the number of packets being transmitted through the network approaches the packet handling capacity of the network. Congestion control refers to the mechanisms and techniques used to control or prevent congestion so that ...
Full solved answer →List one difference between open-loop and closed-loop congestion control. Explain acknowledgement policy and discarding policy [5]
--- Feature Open-Loop Closed-Loop --------- Feedback No feedback is used; congestion is prevented by good design before it occurs Feedback is used; the network monitors congestion and takes corrective action after it occurs In short: Open-loop control deals...
Full solved answer →Leaky-bucket algorithm
Explain leaky-bucket algorithm with an example [5]
The leaky bucket algorithm is a traffic shaping and congestion control mechanism used in computer networks to control the rate at which data packets are sent into the network. It smooths out bursty traffic and converts it into a steady, uniform output strea...
Full solved answer →Explain leaky-bucket algorithm. Illustrate with an example. What are its advantages and disadvantages?[10]
The Leaky Bucket Algorithm is a traffic shaping and congestion control mechanism used in computer networks to control the rate at which data packets are transmitted into the network. It smooths out bursty traffic and converts it into a steady, uniform strea...
Full solved answer →Quality of Service
Describe Quality of Service. What are its practical significances? [5]
Quality of Service (QoS) refers to the set of techniques and mechanisms used to manage network resources by prioritizing certain types of network traffic to ensure predictable and reliable performance for applications that require it. It defines the overall...
Full solved answer →Open-loop congestion control
Write short notes on Open-loop and POP. [5]
Note: The reference notes did not contain material on this topic. The following answer is based on standard Operating Systems / Computer Architecture curriculum as taught in BSc CSIT. --- Open-loop control is a type of system control mechanism in which no f...
Full solved answer →Make Unit 6 stick
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