The correct answer is a DHCP starvation attack. This is because the attacker is exploiting the DHCP protocol by sending a flood of DHCP discover messages, each with a unique client ID, from a single MAC address to exhaust the server’s IP address pool. Once the pool is depleted, legitimate clients cannot obtain leases, effectively causing a denial of service. On the CompTIA Network+ N10-009 exam, this scenario tests your ability to distinguish between DHCP-specific attacks and general network flooding; a common trap is confusing it with a MAC flooding attack, which targets switch CAM tables instead. Remember the key clue: the attack focuses on the DHCP server’s address pool, not the switch’s forwarding table. A useful memory tip is to think “Starvation = Server’s Pool Drained,” linking the attacker’s goal of starving legitimate clients of IP addresses directly to the server’s exhausted lease scope.
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 security analyst is reviewing logs and finds that a single MAC address is rapidly requesting IP addresses from a DHCP server, each time with a different client ID. The DHCP server is exhausting its address pool. Which type of attack is occurring?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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DHCP starvation attack
A DHCP starvation attack occurs when an attacker sends numerous DHCP discover messages, each with a unique client ID (chaddr), to exhaust the DHCP server's address pool. This prevents legitimate clients from obtaining IP addresses, as the server believes all leases are assigned. The rapid requests with different client IDs from a single MAC address are a hallmark of this attack.
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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DHCP starvation attack
Why this is correct
This is exactly the description of a DHCP starvation attack, where the attacker floods the DHCP server with requests to deplete the address pool.
Related concept
Read the scenario before looking for a memorised answer.
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MAC flooding attack
Why it's wrong here
MAC flooding attacks target the switch's MAC address table, not DHCP servers.
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ARP spoofing
Why it's wrong here
ARP spoofing involves sending fake ARP replies to associate an attacker's MAC with an IP address, not DHCP exhaustion.
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DNS poisoning
Why it's wrong here
DNS poisoning corrupts DNS cache to redirect traffic, unrelated to DHCP exhaustion.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing DHCP starvation with MAC flooding, as both involve 'flooding' and MAC addresses, but MAC flooding targets switch CAM tables, not DHCP servers.
Detailed technical explanation
How to think about this question
Under the hood, a DHCP starvation attack exploits the DHCP discover-offer-request-acknowledge (DORA) process by sending discover messages with spoofed chaddr (client hardware address) values, often using a tool like Yersinia or dhcpstarv. The DHCP server, per RFC 2131, treats each unique chaddr as a separate client and allocates an IP address from the pool, leading to exhaustion. In a real-world scenario, an attacker might combine this with a rogue DHCP server to then assign malicious gateway addresses after starving the legitimate server.
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 N10-009 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.
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: DHCP starvation attack — A DHCP starvation attack occurs when an attacker sends numerous DHCP discover messages, each with a unique client ID (chaddr), to exhaust the DHCP server's address pool. This prevents legitimate clients from obtaining IP addresses, as the server believes all leases are assigned. The rapid requests with different client IDs from a single MAC address are a hallmark of this attack.
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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