The correct answer is a smurf attack. This is because the smurf attack specifically exploits ICMP by sending echo request packets to a network’s broadcast address with a spoofed source IP address of the intended victim, causing every host on that subnet to reply to the victim simultaneously. The resulting amplification of traffic overwhelms the target, leading to the performance degradation described. On the CompTIA Network+ N10-009 exam, this scenario tests your understanding of network-based denial-of-service vectors and the misuse of broadcast addressing; a common trap is confusing it with a ping flood, which targets a single host directly rather than using broadcast amplification. To remember it, think of the cartoon character Smurf—one little blue creature shouts, and an entire village shouts back, just like one spoofed ICMP request triggers a flood of replies.
N10-009 Network Security Practice Question
This N10-009 practice question tests your understanding of network security. 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 network administrator notices that a large number of ICMP echo request packets are being sent to the broadcast address of the network from a single host. This is causing performance degradation. Which type of attack is this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Smurf attack
The smurf attack exploits ICMP by sending echo request packets to a network's broadcast address with a spoofed source IP of the victim. All hosts on the network then reply to the victim, overwhelming it with traffic and causing performance degradation. This matches the scenario of a single host sending ICMP echo requests to the broadcast address.
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.
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ARP spoofing
Why it's wrong here
ARP spoofing involves sending fake ARP messages to associate a MAC address with an IP address, not ICMP broadcasts.
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MAC flooding
Why it's wrong here
MAC flooding overwhelms a switch's CAM table with fake MAC addresses, causing it to flood traffic.
✓
Smurf attack
Why this is correct
A Smurf attack uses ICMP echo requests to a broadcast address to create a denial-of-service via amplification.
Related concept
Read the scenario before looking for a memorised answer.
✗
DNS amplification
Why it's wrong here
DNS amplification uses small queries to generate large responses, but it targets DNS servers, not broadcast addresses.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between amplification attacks (smurf vs. DNS amplification) by focusing on the protocol used (ICMP vs. UDP) and the target address (broadcast vs. open resolver), leading candidates to confuse smurf with DNS amplification if they only remember 'amplification' without the protocol details.
Detailed technical explanation
How to think about this question
The smurf attack relies on the directed broadcast feature, which was common in older routers (e.g., Cisco IOS before 'no ip directed-broadcast' became default). Each host on the target network receives the ICMP echo request and sends an echo reply to the spoofed source, creating amplification equal to the number of hosts. Modern networks mitigate this by disabling directed broadcasts and using ingress filtering (RFC 2827) to block spoofed traffic.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Network Security — This question tests Network Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Smurf attack — The smurf attack exploits ICMP by sending echo request packets to a network's broadcast address with a spoofed source IP of the victim. All hosts on the network then reply to the victim, overwhelming it with traffic and causing performance degradation. This matches the scenario of a single host sending ICMP echo requests to the broadcast address.
What should I do if I get this N10-009 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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