350-401 Question #320: Real Exam Question with Answer & Explanation

The correct answer is C: FIFO. FIFO (First-In, First-Out) is a queuing method that transmits packets strictly in the order they were received, without any prioritization.

Submitted by eva_at· Mar 6, 2026DOMAIN_LIST_NOT_PROVIDED

Question

Which QoS queuing method transmits packets out of the interface in the order the packets arrive?

Options

Acustom
Bweighted- fair
CFIFO
Dpriority

Explanation

FIFO (First-In, First-Out) is a queuing method that transmits packets strictly in the order they were received, without any prioritization.

Common mistakes.

A. Custom queuing assigns packets to specific queues based on defined criteria and services them in a round-robin fashion, not strictly by arrival order.
B. Weighted Fair Queuing (WFQ) provides fair bandwidth allocation by prioritizing smaller packets and traffic from low-volume conversations, reordering packets from their arrival sequence.
D. Priority queuing strictly prioritizes packets by assigning them to different priority queues, ensuring higher-priority packets are transmitted before lower-priority ones, regardless of arrival order.

Concept tested. QoS queuing methods (FIFO)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conmgt/configuration/xe-16/qos-conmgt-xe-16-book/qos-conmgt-xe-16-chap.html#concept_z53_m22_yz

Topics

#QoS queuing#FIFO

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