Question 269 of 2,152

DHCP (IPv4 and IPv6) →hardMultiple ChoiceObjective-mapped

DHCP Pool Excluded-Address: No Bindings in show ip dhcp binding

This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.

An engineer configures a DHCP server on a Cisco router to assign IP addresses from a pool. Clients receive addresses, but when the engineer checks 'show ip dhcp binding', no bindings are displayed. Which is the most likely explanation?

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.

A
The DHCP pool is configured with 'lease infinite', causing bindings to be stored in a different database.
Why wrong: Incorrect: Infinite lease still creates bindings; they should appear.
B
The 'ip dhcp excluded-address' command includes the entire pool range, so no addresses are assigned and no bindings are created.
Correct: If the excluded address range covers the pool, the server will not assign any addresses, and no bindings are created.
C
The router's DHCP server is configured in 'database' mode, which stores bindings externally.
Why wrong: Incorrect: The database command stores bindings in a file, but they still appear in 'show ip dhcp binding'.
D
The clients are using DHCPv6, not DHCPv4.
Why wrong: Incorrect: The command 'show ip dhcp binding' is for IPv4; DHCPv6 uses different commands.

Full breakdown with real-world context →

Quick Answer

The answer is that the `ip dhcp excluded-address` command has been configured to cover the entire DHCP pool range, preventing any addresses from being assigned and thus creating no bindings. When a Cisco router’s DHCP server excludes every address in the pool, it cannot lease any IPs to clients; instead, it responds with NAKs, so the `show ip dhcp binding` output remains empty because no active leases exist. On the CCNP ENARSI 300-410 exam, this tests your understanding of how exclusion logic interacts with pool configuration—a common trap is assuming a misconfigured lease time or client release is the cause, when the real issue is an overly broad excluded-address range. Remember the memory tip: “If the pool is fully excluded, the binding list is fully excluded.”

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

✓

The 'ip dhcp excluded-address' command includes the entire pool range, so no addresses are assigned and no bindings are created.

The 'show ip dhcp binding' command only displays bindings that are currently active. If the lease time is very short or the clients release addresses, bindings may not appear. However, a more subtle edge case is when the DHCP server is configured with 'ip dhcp excluded-address' that includes the pool range, causing the server to not assign addresses but still respond with NAKs.

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.

✗
The DHCP pool is configured with 'lease infinite', causing bindings to be stored in a different database.
Why it's wrong here
Incorrect: Infinite lease still creates bindings; they should appear.
✓
The 'ip dhcp excluded-address' command includes the entire pool range, so no addresses are assigned and no bindings are created.
Why this is correct
Correct: If the excluded address range covers the pool, the server will not assign any addresses, and no bindings are created.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The router's DHCP server is configured in 'database' mode, which stores bindings externally.
Why it's wrong here
Incorrect: The database command stores bindings in a file, but they still appear in 'show ip dhcp binding'.
✗
The clients are using DHCPv6, not DHCPv4.
Why it's wrong here
Incorrect: The command 'show ip dhcp binding' is for IPv4; DHCPv6 uses different commands.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Trap categories for this question

Command / output trap
Incorrect: The database command stores bindings in a file, but they still appear in 'show ip dhcp binding'.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this 300-410 question test?

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: The 'ip dhcp excluded-address' command includes the entire pool range, so no addresses are assigned and no bindings are created. — The 'show ip dhcp binding' command only displays bindings that are currently active. If the lease time is very short or the clients release addresses, bindings may not appear. However, a more subtle edge case is when the DHCP server is configured with 'ip dhcp excluded-address' that includes the pool range, causing the server to not assign addresses but still respond with NAKs.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". 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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