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300-410 Practice Question: Which IPv6 traffic filter can be used to match…
Which IPv6 traffic filter can be used to match traffic based on the Flow Label field?
⚠ Common exam trap
Cisco often tests the distinction between packet-matching tools (access-lists) and route-matching tools (prefix-lists, route-maps), leading candidates to incorrectly select prefix-lists or route-maps when the question involves header fields like Flow Label.
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
✓
IPv6 access-list with the 'flow-label' option
The IPv6 access-list supports the 'flow-label' keyword, which allows matching packets based on the 20-bit Flow Label field in the IPv6 header. This field is defined in RFC 2460 and is used for per-flow processing, such as QoS or load balancing, without needing to inspect upper-layer headers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
IPv6 access-list with the 'flow-label' option
Why this is correct
The 'flow-label' keyword allows matching the 20-bit Flow Label field in the IPv6 header.
- ✗
IPv6 prefix-list
Why it's wrong here
Prefix-lists match on prefixes, not flow labels.
- ✗
IPv6 route-map with match ipv6 address
Why it's wrong here
Route-maps can reference access-lists but do not directly match flow labels.
- ✗
IPv6 uRPF
Why it's wrong here
uRPF checks routing table reachability, not flow labels.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 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 300-410 exam.