Which queuing mechanism has no provision for prioritizing or buffering but simply forwards packets in the order they arrive?

The queuing mechanism that has no provision for prioritizing or buffering and simply forwards packets in the order they arrive is FIFO (First In, First Out). In FIFO queuing, packets are processed in the order they arrive, with no differentiation based on priority or class of service. There is no mechanism to prioritize certain types of traffic; each packet is handled identically, in the order of its arrival. This is the simplest form of queuing but can be inefficient for mixed traffic types, especially in high-bandwidth or congested networks.