Question

Congestion avoidance mechanism that addresses packet loss caused by tail drop. This occurs when new incoming packets are dropped due to the router's stacked queue. This is called ________ (Acronym)

a) RED
b) WRED
c) FIFO
d) QoS

Answer 1

The RED (Random Early Detection) mechanism prevents packet loss due to tail drop by managing congestion proactively before queues fill up completely, making option a) the correct answer.

Step-by-step explanation:

The congestion avoidance mechanism that addresses packet loss caused by tail drop, when new incoming packets are dropped due to the router's full queue, is called RED, which stands for Random Early Detection. Option a) RED is the correct answer to this question. RED works by detecting the early stages of congestion before the queue becomes full and proactively managing the queue by randomly dropping packets. This helps to avoid a situation where all packets are dropped when the queue fills up, which is known as tail drop. Such proactive queue management can prevent global TCP synchronization, which can occur when multiple connections reduce their transmission rates simultaneously, resulting in a significant decrease in overall network throughput.