Token Bucket vs Leaky Bucket PDF

221 Token Bucket vs Leaky Bucket ** Token Bucket and Leaky Bucket are two algorithms used for network traffic shaping and ** ** ** *** ** ** rate limiting. They help manage the...

221 Token Bucket vs Leaky Bucket ** Token Bucket and Leaky Bucket are two algorithms used for network traffic shaping and ** ** ** *** ** ** rate limiting. They help manage the rate of traffic flow in a network, but they do so in *** slightly different ways. [Token Bucket vs Leaky Bucket] ~ ~ * Token Bucket Algorithm * ** Mechanism: ** The Token Bucket algorithm is based on tokens being added to a bucket at a ** ** * fixed rate. * * Each token represents permission to send a certain amount of data. * When a packet (data) needs to be sent, it can only be transmitted if there is a * ** token available, which is then removed from the Token Bucket. ** * * ** ** ** ** *  ! ❗ ** Characteristics: ** ** Burst Allowance: Can handle bursty traffic because the bucket can store tokens, ** allowing for temporary bursts of data as long as there are tokens in the bucket. *** *** ** Flexibility: The rate of token addition and the size of the bucket can be adjusted ** *** *** *** *** to control the data rate. ** Example: Think of a video streaming service. The service allows data bursts for fast ** *** *** *** initial streaming (buffering) as long as tokens are available in the bucket. ** * * Once the tokens are used up, the streaming rate is limited to the rate of token * * replenishment. * ** Pros: ** Allows for flexibility in handling bursts of traffic. *** ** ** ** * Useful for applications where occasional bursts are acceptable. *** ** * ** Cons: ** Requires monitoring the number of available tokens, which might add * * * complexity. * * Leaky Bucket Algorithm * ** Mechanism: In the Leaky Bucket algorithm, packets are added to a queue (bucket), and ** ** ** they are released at a steady, constant rate. *** *** *** If the bucket (buffer) is full, incoming packets are discarded or queued for later *** * * * * * * transmission. ** Characteristics: ** ** Smooth Traffic: Ensures a steady, uniform output rate regardless of the input ** *** *** burstiness. ** Overflow: Can result in packet loss if the bucket overflows. ** * ** ** * ** Example: Imagine an ISP limiting internet speed. The ISP uses a Leaky Bucket to ** *** *** ** ** * smooth out the internet traffic. * * Regardless of how bursty the incoming traffic is, the data flow to the user is at a *  ❗ ! ℹ * consistent, predetermined rate. * *** If the data comes in too fast and the bucket fills up, excess packets are dropped. *** * * ** Pros: ** * Simple to implement and understand. * Ensures a steady, consistent flow of traffic. * * ** Cons: ** Does not allow for much flexibility in handling traffic bursts. ~~ ~~ Can lead to packet loss if incoming rate exceeds the bucket’s capacity. * * Key Differences ** Traffic Burst Handling: ** ** Token Bucket allows for bursts of data until the bucket's tokens are exhausted, ** *** *** making it suitable for applications where such bursts are common. * In contrast, the Leaky Bucket smooths out the data flow, releasing packets at a * ** ** * * steady, constant rate. ** Use Cases: ** ** Token Bucket is ideal for applications that require flexibility and can tolerate ** * * * bursts, like video streaming. * *** *** ** Preloading and Buffering: Video streaming applications often buffer ** * * content in advance to avoid interruptions. This means they download a *** ~~ ~~*** *** burst of data ahead of time to store part of the video locally on the device. *** ** Leaky Bucket is suited for scenarios where a steady, continuous data flow is ** *** *** required, like voice over IP (VoIP) or real-time streaming. *** *** *** *** *** VoIP is a real-time application. It cannot buffer audio because people are *** ~~ ~~ talking live, and any delay will break the flow of conversation. Conclusion Choosing between Token Bucket and Leaky Bucket depends on the specific requirements ** ** ** ** * for traffic management in a network. * ** Token Bucket offers more flexibility and is better suited for bursty traffic scenarios, ** *** *** *** *** * while Leaky Bucket is ideal for maintaining a uniform output rate. * ** ** *** ***