N10-009 Network Security Practice Question
An attacker sends ICMP echo request packets to the broadcast address of a network, with the source IP address spoofed to be the target's IP address. This causes all hosts on the network to send ICMP echo replies to the target, overwhelming it. Which type of attack is this?
⚠ Common exam trap
CompTIA often tests the distinction between Smurf (ICMP) and Fraggle (UDP) attacks, so candidates mistakenly choose Fraggle when they see 'broadcast' and 'spoofed source' without noting the protocol used.
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
✓
Smurf attack
This is a classic Smurf attack, which exploits ICMP by sending echo request packets to the network's broadcast address with the source IP spoofed as the target. All hosts on the network receive the request and reply to the spoofed source, flooding the target with ICMP echo replies and consuming its bandwidth or resources.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Smurf attack
Why this is correct
A Smurf attack is a classic distributed denial-of-service (DDoS) technique that leverages ICMP echo requests. The attacker sends these requests to a network's broadcast address, but with the source IP address spoofed to that of the intended victim. Every host on the target network that receives the broadcast then replies to the spoofed source IP, overwhelming the victim with a flood of ICMP echo replies.
- ✗
Fraggle attack
Why it's wrong here
A Fraggle attack is a variant of the Smurf attack, distinguished by its use of UDP echo packets, typically targeting port 7 (echo) or port 19 (chargen), instead of ICMP. Similar to Smurf, the attacker sends UDP packets to a network's broadcast address with a spoofed source IP belonging to the victim. This causes all responsive hosts on the network to send UDP replies back to the victim, creating a denial-of-service condition through amplification.
When this WOULD be correct
A question describing an attacker sending spoofed UDP packets to the broadcast address, causing hosts to reply to the target, would have Fraggle as the correct answer.
- ✗
Ping flood
Why it's wrong here
A ping flood is a straightforward denial-of-service (DoS) attack that involves overwhelming a target system with a massive volume of ICMP echo request packets. Unlike amplification attacks, a ping flood does not rely on spoofing a source IP to a broadcast address for amplification. Instead, the attacker directly sends a continuous stream of ICMP packets to the victim, aiming to consume all available bandwidth or exhaust the target's processing resources.
When this WOULD be correct
A ping flood would be correct if the question described an attacker sending a large number of ICMP echo requests directly to a target host from a single source (or multiple sources without amplification), overwhelming its network bandwidth or processing capacity.
- ✗
ARP poisoning
Why it's wrong here
ARP poisoning, or ARP spoofing, is a Layer 2 attack where an attacker sends forged Address Resolution Protocol (ARP) messages onto a local area network. The goal is to associate the attacker's MAC address with the IP address of another host, such as the default gateway or another client. This manipulation allows the attacker to intercept, modify, or stop traffic between the legitimate devices, facilitating man-in-the-middle attacks rather than network-wide floods.
When this WOULD be correct
An exam question describing an attacker sending forged ARP replies to associate their MAC address with the default gateway's IP, causing traffic interception or man-in-the-middle attacks.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓Smurf attackCorrect answer▾
Why this is correct
A Smurf attack is a classic distributed denial-of-service (DDoS) technique that leverages ICMP echo requests. The attacker sends these requests to a network's broadcast address, but with the source IP address spoofed to that of the intended victim. Every host on the target network that receives the broadcast then replies to the spoofed source IP, overwhelming the victim with a flood of ICMP echo replies.
✗Fraggle attackWrong answer — click to see why▾
Why this is wrong here
The Fraggle attack uses UDP echo packets (typically to port 7 or 19) instead of ICMP echo requests, so the description of ICMP packets makes this incorrect.
★ When this WOULD be the correct answer
A question describing an attacker sending spoofed UDP packets to the broadcast address, causing hosts to reply to the target, would have Fraggle as the correct answer.
Why candidates choose this
Candidates may confuse Smurf (ICMP) and Fraggle (UDP) because both are broadcast amplification attacks with similar mechanisms.
✗Ping floodWrong answer — click to see why▾
Why this is wrong here
A ping flood typically involves sending a high volume of ICMP echo request packets directly to a single target, not using a broadcast address to amplify traffic from multiple hosts.
★ When this WOULD be the correct answer
A ping flood would be correct if the question described an attacker sending a large number of ICMP echo requests directly to a target host from a single source (or multiple sources without amplification), overwhelming its network bandwidth or processing capacity.
Why candidates choose this
Candidates may confuse the use of ICMP echo requests in both attacks, and the term 'flood' suggests overwhelming traffic, but they miss the amplification mechanism via broadcast address that distinguishes a smurf attack.
✗ARP poisoningWrong answer — click to see why▾
Why this is wrong here
ARP poisoning involves manipulating ARP tables to intercept traffic, not flooding a target with ICMP replies via broadcast amplification.
★ When this WOULD be the correct answer
An exam question describing an attacker sending forged ARP replies to associate their MAC address with the default gateway's IP, causing traffic interception or man-in-the-middle attacks.
Why candidates choose this
Candidates may confuse network-layer attacks, thinking ARP poisoning can also cause denial of service by flooding, but it primarily targets data interception.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Quick reference
IPv4 Address Class Summary
| Class | First Octet Range | Default Mask | Networks | Hosts per Network |
|---|---|---|---|---|
| A | 1–126 | /8 (255.0.0.0) | 126 | 16,777,214 |
| B | 128–191 | /16 (255.255.0.0) | 16,384 | 65,534 |
| C | 192–223 | /24 (255.255.255.0) | 2,097,152 | 254 |
| D | 224–239 | N/A | Multicast groups | — |
| E | 240–255 | N/A | Reserved / experimental | — |
127.x.x.x is reserved for loopback. Modern networks use CIDR (classless) rather than classful addressing.
Go deeper
Related to this question
Learn chapter
Network Device Hardening
Key term
Flooding
Flooding is a network switching technique where a switch sends incoming frames out through all its ports except the one it received the frame from, to ensure the frame reaches its destination when the switch does not know the correct port.
Key term
ICMP
ICMP is a network protocol used by devices to send error messages and operational information about network communication problems.
About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This N10-009 practice question is part of Courseiva's free CompTIA 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 N10-009 exam.