Drag and drop each DSCP PHB on the left to its matching queue treatment on the right.
Drag a concept onto its matching description — or click a concept then click the description.
Strict priority queue, low latency
Assured forwarding with drop precedence
Class selector, maps to IP precedence
Best-effort, no bandwidth guarantee
Default PHB, identical to BE
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
EF: Strict priority queue, low latency
EF is for low-latency traffic (strict priority). AF uses four classes with drop probabilities. CS is backward-compatible with IP precedence. BE is best-effort with no guarantees. DF is the default PHB (same as BE).
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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.