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 DHCP server logs and notices that a single MAC address is sending an extremely high number of DHCP discover packets. The DHCP server is responding, but the client never sends a DHCP request. 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.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A) DHCP starvation
A DHCP starvation attack works by flooding the DHCP server with DHCPDISCOVER packets from spoofed MAC addresses, exhausting the server's IP address pool. In this scenario, a single MAC address sending excessive DHCPDISCOVER packets without completing the DORA handshake (no DHCPREQUEST) is a classic indicator of a starvation attack, as the attacker aims to consume all available leases and cause a denial of service for legitimate clients.
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.
✓
A) DHCP starvation
Why this is correct
Correct. This is a classic DHCP starvation attack, where the attacker sends many DHCP discovers to deplete the IP pool.
Clue confirmation
The clue words "most likely", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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B) ARP poisoning
Why it's wrong here
ARP poisoning involves sending forged ARP replies to associate a MAC address with a different IP, not DHCP discovers.
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C) MAC flooding
Why it's wrong here
MAC flooding aims to overflow the switch's MAC address table with fake MAC addresses, causing the switch to act like a hub.
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D) DNS spoofing
Why it's wrong here
DNS spoofing corrupts DNS responses to redirect users to malicious sites, unrelated to DHCP.
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 at Layer 2, while DHCP starvation targets the DHCP server at Layer 7 (application layer) using DHCP protocol messages.
Detailed technical explanation
How to think about this question
DHCP starvation exploits the fact that DHCP servers allocate leases based on the client identifier (typically the MAC address) in the DHCPDISCOVER message. An attacker can use tools like 'yersinia' or 'dhcpstarv' to rapidly generate DHCPDISCOVER packets with randomized MAC addresses, causing the server to reserve IP addresses for nonexistent clients. Once the pool is exhausted, legitimate clients receive DHCPNAK messages and cannot obtain an IP address, effectively creating a denial-of-service condition on the network.
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: A) DHCP starvation — A DHCP starvation attack works by flooding the DHCP server with DHCPDISCOVER packets from spoofed MAC addresses, exhausting the server's IP address pool. In this scenario, a single MAC address sending excessive DHCPDISCOVER packets without completing the DORA handshake (no DHCPREQUEST) is a classic indicator of a starvation attack, as the attacker aims to consume all available leases and cause a denial of service for legitimate clients.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "never". 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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