CEH Practice Question: Malware, Social Engineering and Network Attacks
Which DDoS attack type exploits a small query to a vulnerable service that generates a large response directed at the victim?
⚠ Common exam trap
Many exam-takers confuse amplification attacks with simple volumetric floods (like ICMP or SYN floods), failing to recognize that the key differentiator is the use of a vulnerable service that generates a disproportionately large response from a small query.
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
✓
Amplification attack
An amplification attack is correct because it exploits a small query (e.g., a DNS lookup with a spoofed source IP) sent to a vulnerable service like an open DNS resolver or NTP server, which then generates a large response (e.g., 50-100x the query size) directed at the victim. This leverages the protocol's amplification factor and the lack of source IP validation, overwhelming the victim's bandwidth. The attack is a type of reflection attack, where the intermediary service unwittingly amplifies traffic toward the target.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Amplification attack
Why this is correct
An amplification attack leverages vulnerable, open UDP services (like DNS, NTP, or Memcached) as reflectors to magnify traffic. Attackers send small, spoofed query packets to these services, with the source IP address set to the victim's IP. The reflector service then responds with a significantly larger response packet, directed at the unsuspecting victim, multiplying the attack traffic volume and overwhelming the target.
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HTTP flood
Why it's wrong here
An HTTP flood is an application-layer DDoS attack that overwhelms web servers by sending a high volume of legitimate-looking HTTP GET or POST requests. This attack aims to exhaust server resources such as CPU, memory, and database connections, causing the web application to slow down or become unresponsive. Unlike amplification, it directly targets the web server's processing capabilities rather than leveraging third-party reflectors for traffic multiplication.
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SYN flood
Why it's wrong here
A SYN flood is a classic transport-layer DDoS attack that exploits the TCP three-way handshake by sending a rapid succession of SYN requests to a target server. The attacker spoofs the source IP address, preventing the server from completing the handshake and leaving numerous half-open connections. This consumes the server's connection table resources, preventing legitimate connections, but does not involve amplifying traffic through third-party services.
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ICMP flood
Why it's wrong here
An ICMP flood, often referred to as a 'ping flood,' is a volumetric DDoS attack that overwhelms a target's network bandwidth with a massive stream of ICMP echo request packets. The attacker sends these requests directly to the victim, aiming to consume all available network resources and render the target inaccessible. While it generates high traffic volume, it does not utilize a small query to a vulnerable service to amplify the attack size.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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