350-501 Security and Services Practice Question
During a DDoS attack, an SP wants to drop traffic destined to the victim IP at the network edge without affecting other traffic. Which technique should be used to achieve this by propagating a black-hole route from a trigger router to all edge 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
✓
S/RTBH (Remotely Triggered Black Hole) using BGP community
S/RTBH uses BGP to advertise a /32 route with a specific community to trigger routers to install a null route. This drops traffic to the victim IP at the edge. FlowSpec is more flexible but not specifically for RTBH; Peakflow detects anomalies; IDMS scrubs traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
S/RTBH (Remotely Triggered Black Hole) using BGP community
Why this is correct
S/RTBH advertises a /32 route with a blackhole community to trigger null routing.
- ✗
Cisco Peakflow to reroute traffic
Why it's wrong here
Peakflow is an anomaly detection system, not a traffic blackholing technique.
- ✗
BGP FlowSpec to distribute filtering rules
Why it's wrong here
FlowSpec can filter traffic based on multiple criteria but is not the standard RTBH mechanism.
- ✗
IDMS to scrub traffic
Why it's wrong here
IDMS scrubs traffic by redirecting it to a cleaning center, not blackholing at the edge.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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