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350-501 Security and Services Practice Question

During a DDoS attack, a service provider uses Cisco Peakflow to detect anomalous traffic and then triggers S/RTBH. What must be configured on the router to black hole attack traffic using a /32 null route?

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 static route to Null0 for the victim IP and a BGP community to trigger blackholing

S/RTBH relies on BGP to propagate a /32 route with a specific community (commonly no-export) pointing to a null interface (e.g., Null0). The trigger router sets the next-hop to a static route pointing to Null0 and advertises it via BGP.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    QoS policy to rate-limit attack traffic

    Why it's wrong here

    Rate-limiting may not fully mitigate high-volume attacks.

  • ✗

    An inbound ACL blocking the attack source IPs

    Why it's wrong here

    ACLs are not scalable for large attacks and don't use BGP.

  • ✓

    A static route to Null0 for the victim IP and a BGP community to trigger blackholing

    Why this is correct

    This is the standard S/RTBH mechanism.

  • ✗

    PBR to redirect traffic to a scrubbing center

    Why it's wrong here

    That's IDMS, not S/RTBH.

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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.