Question 269 of 2,152

DHCP (IPv4 and IPv6) →hardMultiple ChoiceObjective-mapped

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.”

300-410 DHCP (IPv4 and IPv6) Practice Question

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.

Question 1hardmultiple choice

Read the full DHCP explanation →

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 →

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: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

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

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.

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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) — Static NAT maps one inside address to one outside address..

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?

Static NAT maps one inside address to one outside address.

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