Random early detection (RED) is a queue management algorithm. It is also a congestion avoidance algorithm. In providing services to people, and in computer science, transport and operations research a queue is a First-In-First-Out (FIFO) process â€” the first element in the queue will be the first one out. ... Flowcharts are often used to represent algorithms. ... Network congestion avoidance is a process used in computer networks to avoid congestion. ...

In the traditional tail drop algorithm, a router or other network component buffers as many packets as it can, and simply drops the ones it can't buffer. If buffers are constantly full, network is congested. Tail drop distributes buffer space unfairly among traffic flows. Tail drop can also lead to global synchronization as all TCP connections "hold back" simultaneously. Networks become under-utilized. A router is a computer networking device that forwards data packets across an internetwork toward their destinations, through a process known as routing. ... Computer networking devices are units that mediate data in a computer network. ... Congestion is a state of excessive accumulation or overfilling or overcrowding. ... The Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite. ...

RED addresses these issues. It monitors the average queue size and drops (or marks when used in conjunction with ECN) packets based on statistical probabilities. If the buffer is almost empty, all incoming packets are accepted. As the queue grows, the probability for dropping an incoming packet grows too. When the buffer is full, the probability has reached 1 and all incoming packets are dropped. Network congestion avoidance is a process used in computer networks to avoid congestion. ...

RED is considered more fair than tail drop. The more a host transmits, the more likely it is that its packets are dropped. Early detection helps avoid global synchronization. TCP global synchronization in data networking can happen to TCP/IP flows during periods of congestion because each sender will reduce their transmission rate at the same time when packet loss occurs. ...

RED makes Quality of Service (QoS) differentiation impossible. Weighted RED (WRED) and RED In/Out (RIO) provide early detection with some QoS considerations. In the fields of packet-switched networks and computer networking, the traffic engineering term Quality of Service (QoS) refers to the probability of the telecommunication network meeting a given traffic contract, or in many cases is used informally to refer the probability of a packet succeeding in passing between two... Weighted random early detection (WRED) is a queue management algorithm with congestion avoidance capabilities. ...