The answer is a DHCP server binding table filled with a large number of leases from spoofed MAC addresses. This is the primary symptom because a DHCP starvation attack floods the server with fake DISCOVER messages, each using a unique, fabricated MAC address, which forces the server to exhaust its available IP address pool. Once the pool is depleted, legitimate clients sending DISCOVER messages receive no OFFER, effectively causing a denial of service. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your ability to distinguish between the attack’s cause (spoofed MACs) and its effect (pool exhaustion); a common trap is confusing the symptom with the result—pool exhaustion is the consequence, but the visible indicator in logs or the binding table is the flood of unknown MACs and excessive leases. Remember the memory tip: “Spoofed MACs fill the rack” — the binding table is the rack, and each spoofed MAC is a coat that takes up a lease slot, leaving no room for legitimate clients.
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which THREE symptoms indicate a DHCP IPv4 starvation attack or address pool exhaustion? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Legitimate clients fail to obtain an IP address via DHCP.
Option A is correct because a DHCP starvation attack exhausts the available IP addresses in the pool, preventing legitimate clients from obtaining a lease. When the address pool is fully depleted, the DHCP server cannot respond to new DISCOVER messages, causing clients to fail to acquire an IP 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.
✓
Legitimate clients fail to obtain an IP address via DHCP.
Why this is correct
Pool exhaustion prevents new leases for real clients.
Related concept
Read the scenario before looking for a memorised answer.
✓
The DHCP pool shows 100% utilization with many unknown MAC addresses.
Why this is correct
High utilization with fake MACs indicates starvation.
Related concept
Read the scenario before looking for a memorised answer.
✓
The DHCP server's binding table contains a large number of leases from spoofed MAC addresses.
Why this is correct
Attackers generate many fake DHCP requests, filling the binding table.
Related concept
Read the scenario before looking for a memorised answer.
✗
Client devices experience high CPU utilization due to DHCP processing.
Why it's wrong here
High CPU on clients is not a typical symptom; the server may have high CPU.
✗
Duplicate IP address detection (DAD) failures are reported on all clients.
Why it's wrong here
DAD failures are not directly caused by DHCP pool exhaustion.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between DHCP starvation symptoms and unrelated network issues like DAD failures or client CPU load, expecting candidates to recognize that only server-side indicators (pool exhaustion, spoofed MACs, client failure) are valid.
Detailed technical explanation
How to think about this question
In a DHCP starvation attack, an attacker sends a flood of DHCP DISCOVER messages with spoofed MAC addresses, causing the server to allocate all available leases. The server's binding table fills with these bogus entries, often showing 100% pool utilization with unknown MAC addresses, as seen in the 'show ip dhcp conflict' or 'show ip dhcp binding' output. Real-world scenarios include rogue devices on a LAN exhausting the /24 subnet, forcing administrators to implement DHCP snooping and port security to mitigate the attack.
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 300-410 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 300-410 question in full detail.
DHCP (IPv4 and IPv6) — This question tests DHCP (IPv4 and IPv6) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Legitimate clients fail to obtain an IP address via DHCP. — Option A is correct because a DHCP starvation attack exhausts the available IP addresses in the pool, preventing legitimate clients from obtaining a lease. When the address pool is fully depleted, the DHCP server cannot respond to new DISCOVER messages, causing clients to fail to acquire an IP address.
What should I do if I get this 300-410 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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