The answer is an ICMP flood. This is correct because the attack involves a high volume of ICMP echo requests from multiple external sources, each with a payload size of 65507 bytes, which overwhelms the target server’s bandwidth and processing resources, causing it to become unresponsive. While the large payload size might suggest a ping of death, that attack relies on a single malformed packet that exceeds the maximum IP packet size to cause a crash or buffer overflow, not a sustained volumetric barrage from many hosts. On the Cisco CyberOps Associate 200-201 exam, this distinction tests your ability to differentiate between a resource-exhaustion flood and a protocol-exploitation attack; a common trap is focusing on the payload size rather than the volume and source diversity. Remember the key: volume equals flood, malformation equals ping of death.
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. 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.
A security analyst is reviewing logs from multiple network devices and notices that a large number of ICMP echo requests with a payload size of 65507 bytes are being sent to a single server from various external IP addresses. The server is becoming unresponsive. Which type of attack is most likely occurring?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Why wrong: A ping of death involves sending a single oversized ICMP packet that causes a buffer overflow, not a high volume of packets.
B
SYN flood
Why wrong: A SYN flood targets TCP connections by sending incomplete SYN packets, not ICMP traffic.
C
Smurf attack
Why wrong: A Smurf attack uses ICMP echo requests sent to a broadcast address with a spoofed source IP, causing all hosts to reply to the victim. This scenario does not mention broadcast addresses or spoofed source IPs.
D
ICMP flood
An ICMP flood sends a high volume of ICMP echo request packets to overwhelm the target's resources, matching the description of many large ping packets from multiple sources.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ICMP flood
D is correct because an ICMP flood attack involves overwhelming a target with a high volume of ICMP echo request packets, consuming bandwidth and processing resources. The large payload size (65507 bytes) is a characteristic of a crafted ICMP packet, but the key indicator here is the sheer volume from multiple sources causing the server to become unresponsive, which aligns with a volumetric ICMP flood rather than a single malformed packet.
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.
✗
Ping of death
Why it's wrong here
A ping of death involves sending a single oversized ICMP packet that causes a buffer overflow, not a high volume of packets.
✗
SYN flood
Why it's wrong here
A SYN flood targets TCP connections by sending incomplete SYN packets, not ICMP traffic.
✗
Smurf attack
Why it's wrong here
A Smurf attack uses ICMP echo requests sent to a broadcast address with a spoofed source IP, causing all hosts to reply to the victim. This scenario does not mention broadcast addresses or spoofed source IPs.
✓
ICMP flood
Why this is correct
An ICMP flood sends a high volume of ICMP echo request packets to overwhelm the target's resources, matching the description of many large ping packets from multiple sources.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between a Ping of Death (single malformed packet) and an ICMP flood (high volume of normal or large packets), where candidates mistakenly choose 'Ping of Death' because they see the large payload size, but the key is the volume and the fact that 65507 bytes is within the legal limit for a single packet.
Trap categories for this question
Scenario analysis trap
A Smurf attack uses ICMP echo requests sent to a broadcast address with a spoofed source IP, causing all hosts to reply to the victim. This scenario does not mention broadcast addresses or spoofed source IPs.
Detailed technical explanation
How to think about this question
ICMP echo requests typically have a payload of 56 or 64 bytes, but attackers can craft packets with the maximum allowed payload of 65507 bytes (the total IP packet size including headers is 65535 bytes, minus 20 for IP header and 8 for ICMP header). In a distributed ICMP flood, multiple sources amplify the traffic, saturating the target's network link and causing denial of service; tools like hping3 or scapy can generate such packets. Real-world scenarios often involve botnets launching ICMP floods to overwhelm enterprise firewalls or servers.
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 practitioner preparing for the 200-201 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ICMP flood — D is correct because an ICMP flood attack involves overwhelming a target with a high volume of ICMP echo request packets, consuming bandwidth and processing resources. The large payload size (65507 bytes) is a characteristic of a crafted ICMP packet, but the key indicator here is the sheer volume from multiple sources causing the server to become unresponsive, which aligns with a volumetric ICMP flood rather than a single malformed packet.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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