Question 1,719 of 2,152

DHCP (IPv4 and IPv6) →hardMultiple ChoiceObjective-mapped

300-410 DHCP (IPv4 and IPv6) Practice Question

This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 DHCPv6 prefix delegation on a Cisco router acting as a requesting client. The router receives a valid IA_PD prefix from the server, but no route for the delegated prefix appears in the routing table. 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
DHCPv6 prefix delegation automatically installs a connected route; the issue is a missing 'ipv6 route' command to point the prefix to the DHCP-learned next-hop.
Why wrong: Incorrect: DHCPv6 PD does not install any route automatically; the prefix is only assigned to an interface.
B
The router's 'ipv6 dhcp client pd' command does not install a route; the engineer must manually configure a static route for the delegated prefix.
Correct: DHCPv6 PD only assigns the prefix to an interface; no route is created. A static route or dynamic routing is needed.
C
The DHCPv6 server must also send a route option; the requesting client cannot install a route without it.
Why wrong: Incorrect: DHCPv6 does not have a route option; routes are configured separately.
D
The router's 'ipv6 unicast-routing' is disabled, preventing route installation.
Why wrong: Incorrect: While unicast routing is needed for forwarding, the absence of a route is due to DHCPv6 PD not creating one.

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 router's 'ipv6 dhcp client pd' command does not install a route; the engineer must manually configure a static route for the delegated prefix.

Option B is correct because the `ipv6 dhcp client pd` command on a Cisco router acting as a DHCPv6 prefix delegation client does not automatically install a route for the delegated prefix into the routing table. The command only assigns the prefix to an interface for use (e.g., with `ipv6 address` commands), but the engineer must manually configure a static route pointing to the DHCP-learned next-hop address to populate the routing table.

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.

✗
DHCPv6 prefix delegation automatically installs a connected route; the issue is a missing 'ipv6 route' command to point the prefix to the DHCP-learned next-hop.
Why it's wrong here
Incorrect: DHCPv6 PD does not install any route automatically; the prefix is only assigned to an interface.
✓
The router's 'ipv6 dhcp client pd' command does not install a route; the engineer must manually configure a static route for the delegated prefix.
Why this is correct
Correct: DHCPv6 PD only assigns the prefix to an interface; no route is created. A static route or dynamic routing is needed.
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 DHCPv6 server must also send a route option; the requesting client cannot install a route without it.
Why it's wrong here
Incorrect: DHCPv6 does not have a route option; routes are configured separately.
✗
The router's 'ipv6 unicast-routing' is disabled, preventing route installation.
Why it's wrong here
Incorrect: While unicast routing is needed for forwarding, the absence of a route is due to DHCPv6 PD not creating one.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the misconception that DHCPv6 prefix delegation automatically installs a route, similar to how DHCPv4 might install a default route, but the `ipv6 dhcp client pd` command only provides prefix assignment, not route installation.

Detailed technical explanation

How to think about this question

In DHCPv6 prefix delegation (RFC 3633), the requesting client uses the `ipv6 dhcp client pd` command to obtain a prefix, which is then typically used to assign subnets to downstream interfaces via `ipv6 address prefix-name` commands. However, the client does not automatically create a route for the delegated prefix; the engineer must manually configure a static route (e.g., `ipv6 route delegated-prefix/prefix-length next-hop-address`) to ensure traffic destined for the prefix is forwarded to the DHCPv6 server or upstream router. This is a common misconfiguration in real-world deployments where the delegated prefix is used for downstream networks.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Related 300-410 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Layer 3 Technologies practice questions

Practise 300-410 questions linked to Layer 3 Technologies.

EIGRP Troubleshooting practice questions

Practise 300-410 questions linked to EIGRP Troubleshooting.

OSPF Troubleshooting (v2/v3) practice questions

Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).

BGP Troubleshooting practice questions

Practise 300-410 questions linked to BGP Troubleshooting.

Route Redistribution practice questions

Practise 300-410 questions linked to Route Redistribution.

Policy-Based Routing (PBR) practice questions

Practise 300-410 questions linked to Policy-Based Routing (PBR).

VRF-Lite practice questions

Practise 300-410 questions linked to VRF-Lite.

Route Maps and Route Filtering practice questions

Practise 300-410 questions linked to Route Maps and Route Filtering.

Administrative Distance practice questions

Practise 300-410 questions linked to Administrative Distance.

Route Summarization practice questions

Practise 300-410 questions linked to Route Summarization.

Bidirectional Forwarding Detection (BFD) practice questions

Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).

VPN Technologies practice questions

Practise 300-410 questions linked to VPN Technologies.

Practice this exam

Start a free 300-410 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

300-410 practice-test guide →Study guide →Browse all practice tests

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 router's 'ipv6 dhcp client pd' command does not install a route; the engineer must manually configure a static route for the delegated prefix. — Option B is correct because the `ipv6 dhcp client pd` command on a Cisco router acting as a DHCPv6 prefix delegation client does not automatically install a route for the delegated prefix into the routing table. The command only assigns the prefix to an interface for use (e.g., with `ipv6 address` commands), but the engineer must manually configure a static route pointing to the DHCP-learned next-hop address to populate the routing table.

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.

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.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.