- A
Use BGP Flowspec to create a rule that drops traffic to the victim
Why wrong: Flowspec can also drop traffic, but RTBH is simpler for /32 blackholing; the question specifically asks about S/RTBH.
- B
Advertise the victim's IP via BGP with a blackhole community to edge routers
This is the standard RTBH mechanism: trigger routers to install a null route for the victim's IP.
- C
Configure a static null route and redistribute into IGP
Why wrong: RTBH uses BGP, not IGP redistribution.
- D
Deploy IDMS traffic scrubbing inline
Why wrong: IDMS scrubs traffic, but S/RTBH is a different mechanism.
Question 620 of 1,000
350-501 Security and Services Practice Question
This 350-501 practice question tests your understanding of security and services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During a DDoS attack, an SP uses Cisco Peakflow for detection and wants to drop attack traffic at the edge routers. They decide to use S/RTBH. Which action must be performed on the edge routers to trigger the black hole?
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
✓
Advertise the victim's IP via BGP with a blackhole community to edge routers
Remotely Triggered Black Hole (RTBH) works by advertising a /32 route for the victim's IP address with a specific BGP community (e.g., NO_EXPORT) to a black hole next-hop (e.g., 192.0.2.1). The edge routers must be configured to trigger based on that community.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use BGP Flowspec to create a rule that drops traffic to the victim
Why it's wrong here
Flowspec can also drop traffic, but RTBH is simpler for /32 blackholing; the question specifically asks about S/RTBH.
- ✓
Advertise the victim's IP via BGP with a blackhole community to edge routers
Why this is correct
This is the standard RTBH mechanism: trigger routers to install a null route for the victim's IP.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a static null route and redistribute into IGP
Why it's wrong here
RTBH uses BGP, not IGP redistribution.
- ✗
Deploy IDMS traffic scrubbing inline
Why it's wrong here
IDMS scrubs traffic, but S/RTBH is a different mechanism.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Security and Services — study guide chapter
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Security and Services practice questions
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FAQ
Questions learners often ask
What does this 350-501 question test?
Security and Services — This question tests Security and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Advertise the victim's IP via BGP with a blackhole community to edge routers — Remotely Triggered Black Hole (RTBH) works by advertising a /32 route for the victim's IP address with a specific BGP community (e.g., NO_EXPORT) to a black hole next-hop (e.g., 192.0.2.1). The edge routers must be configured to trigger based on that community.
What should I do if I get this 350-501 question wrong?
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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.
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