Which queue types are available in RouterOS?

Stochastic Fairness Queuing (SFQ) is indeed one of the queue types available in RouterOS. SFQ is designed to provide fair bandwidth allocation to multiple flows, which helps in managing network traffic efficiently. It operates by ensuring that each flow gets its fair share of the available bandwidth, which can significantly improve performance in congested networks. By using a hashing mechanism, it can differentiate traffic streams and provide equal service to them over time.

The other options listed, while they might describe potential queuing mechanisms that one could envision in network technologies, are not part of the defined queue types in RouterOS. Each of the alternatives does exist in network theory or in other systems but is not implemented in RouterOS as standard queue types. This makes SFQ the correct answer among the choices presented.