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350-401 Practice Question: Which two statements about queuing and congestion…
Which two statements about queuing and congestion management are true? (Choose two.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CBWFQ allows you to define multiple classes and assign each a guaranteed minimum bandwidth.
CBWFQ provides guaranteed bandwidth to classes, while LLQ adds a strict priority queue for delay-sensitive traffic. WFQ is the default on low-speed interfaces. FIFO is used on high-speed interfaces by default. Tail drop is the default drop policy for FIFO and CBWFQ queues.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
CBWFQ allows you to define multiple classes and assign each a guaranteed minimum bandwidth.
Why this is correct
Correct because CBWFQ allocates bandwidth to each class based on the 'bandwidth' command.
- ✓
LLQ combines a strict priority queue with CBWFQ classes to support real-time traffic.
Why this is correct
Correct because LLQ uses the 'priority' command to create a strict priority queue alongside CBWFQ.
- ✗
Weighted Fair Queuing (WFQ) is the default queuing mechanism on all Cisco router interfaces.
Why it's wrong here
Incorrect because WFQ is the default only on low-speed interfaces (below 2.048 Mbps); high-speed interfaces use FIFO by default.
- ✗
Tail drop is the only drop policy available for CBWFQ queues.
Why it's wrong here
Incorrect because CBWFQ can also use WRED (Weighted Random Early Detection) as a drop policy to avoid tail drop.
- ✗
FIFO queuing provides per-class bandwidth guarantees.
Why it's wrong here
Incorrect because FIFO is a single queue without any bandwidth differentiation or guarantees.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.