350-501 Security and Services Practice Question
A network operator wants to distribute traffic filtering rules to multiple routers dynamically during a DDoS attack. Which technology should be used?
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
✓
BGP FlowSpec
BGP FlowSpec (RFC 8955) allows encoding of flow specifications (e.g., source/dest IP, ports, protocol) and distributing them via BGP to routers, which then apply traffic filtering actions (e.g., drop, rate-limit) dynamically.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
uRPF
Why it's wrong here
uRPF prevents spoofing but not dynamic filtering.
- ✗
S/RTBH
Why it's wrong here
S/RTBH only blackholes traffic to a destination IP, not filtering rules.
- ✓
BGP FlowSpec
Why this is correct
FlowSpec distributes fine-grained filtering rules via BGP.
- ✗
ACLs
Why it's wrong here
ACLs are static and not distributed via BGP.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 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 350-501 exam.