350-501 Security and Services Practice Question
A service provider uses BGP FlowSpec (RFC 8955) to mitigate DDoS attacks. Which component in the network is responsible for originating the FlowSpec rules and distributing them to routers?
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
✓
A FlowSpec controller (e.g., router with policy or SDN controller)
In FlowSpec, a controller (or a router acting as controller) originates the FlowSpec NLRI and distributes it to edge routers via BGP. Edge routers apply the actions (e.g., drop, rate-limit). The trigger router is for RTBH; detection system may trigger but does not distribute FlowSpec.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A FlowSpec controller (e.g., router with policy or SDN controller)
Why this is correct
The controller originates FlowSpec NLRI and distributes via BGP.
- ✗
The trigger router used for RTBH
Why it's wrong here
RTBH trigger router advertises /32 routes, not FlowSpec rules.
- ✗
The victim's CE router
Why it's wrong here
The CE does not originate FlowSpec rules.
- ✗
An anomaly detection system like Cisco Peakflow
Why it's wrong here
Peakflow detects anomalies but does not originate FlowSpec rules.
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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.