Which basic queueing method processes packets in arrival order with no packet prioritization?

Which basic queueing method processes packets in arrival order with no packet prioritization?

• A. FIFO
• B. RED
• C. WRED
• D. WFQ

Answer: (A)

The key idea is how a queue handles packets when nothing is prioritized. First-In-First-Out means the first packet that arrives is the first to be transmitted, with no special treatment for any packet type or class. The queue serves packets strictly in the order they arrive, so the arrival order is preserved. This contrasts with other methods: RED and WRED are congestion-management schemes that may drop or mark packets before the queue is full, which can disrupt strict arrival-order processing. WFQ allocates bandwidth based on weights to different flows, effectively prioritizing some traffic over others rather than serving strictly by arrival time. Therefore, the basic method that processes packets in arrival order with no prioritization is FIFO.

The key idea is how a queue handles packets when nothing is prioritized. First-In-First-Out means the first packet that arrives is the first to be transmitted, with no special treatment for any packet type or class. The queue serves packets strictly in the order they arrive, so the arrival order is preserved.

This contrasts with other methods: RED and WRED are congestion-management schemes that may drop or mark packets before the queue is full, which can disrupt strict arrival-order processing. WFQ allocates bandwidth based on weights to different flows, effectively prioritizing some traffic over others rather than serving strictly by arrival time. Therefore, the basic method that processes packets in arrival order with no prioritization is FIFO.