The answer is unusual traffic patterns from many different sources, as this directly reflects the core mechanism of a distributed denial-of-service attack, where a flood of requests originates from a vast, often geographically dispersed botnet rather than a single IP. This overloads the target’s bandwidth or server resources, causing legitimate traffic to time out or be dropped, which manifests as slow network performance and service unavailability. On the Cisco CyberOps Associate 200-201 exam, this concept tests your ability to distinguish DDoS indicators from other attack signatures, such as a single-source DoS or malware beaconing; a common trap is focusing on traffic volume alone without recognizing the distributed source signature. Remember the mnemonic “Many Sources, One Target” to quickly recall that the key indicator is not just high traffic, but traffic arriving from numerous, unrelated IP addresses simultaneously.
200-201 Security Concepts Practice Question
This 200-201 practice question tests your understanding of security concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which THREE are common indicators of a distributed denial-of-service (DDoS) attack? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Slow network performance and service unavailability
Option A is correct because a DDoS attack floods the target with traffic from multiple sources, overwhelming network resources and causing legitimate requests to time out or be dropped. This results in slow network performance and service unavailability as the system struggles to process the excessive load. The distributed nature of the attack makes it difficult to mitigate with simple IP-based filtering.
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.
✓
Slow network performance and service unavailability
Why this is correct
Overwhelmed resources cause slowdowns.
Related concept
Read the scenario before looking for a memorised answer.
✗
A single IP address generating excessive traffic
Why it's wrong here
Single IP suggests a DoS, not distributed.
✓
High bandwidth consumption on the network link
Why this is correct
DDoS floods the link with traffic.
Related concept
Read the scenario before looking for a memorised answer.
✓
Unusual traffic patterns from many different sources
Why this is correct
Many sources indicate a distributed attack.
Related concept
Read the scenario before looking for a memorised answer.
✗
Encrypted traffic from a known malware C2 server
Why it's wrong here
C2 traffic indicates compromise, not necessarily DDoS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between a single-source DoS and a multi-source DDoS, so candidates may incorrectly select 'a single IP address generating excessive traffic' as a DDoS indicator, but the key is the distributed nature of the attack.
Detailed technical explanation
How to think about this question
DDoS attacks often leverage amplification techniques, such as DNS amplification or NTP reflection, where small queries are sent with a spoofed source IP (the victim's) to open resolvers, which then send large responses to the victim. This exploits the UDP protocol's lack of handshake verification, allowing attackers to multiply their bandwidth by factors of 50x or more. Real-world examples include the 2016 Mirai botnet attack that used IoT devices to generate over 1 Tbps of traffic against Dyn DNS.
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.
TExam Day Tips
→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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Slow network performance and service unavailability — Option A is correct because a DDoS attack floods the target with traffic from multiple sources, overwhelming network resources and causing legitimate requests to time out or be dropped. This results in slow network performance and service unavailability as the system struggles to process the excessive load. The distributed nature of the attack makes it difficult to mitigate with simple IP-based filtering.
What should I do if I get this 200-201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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