- A
25%
Why wrong: 25% is not the default; T1 is 50%.
- B
50%
T1 is 50% of the lease time per RFC 2131.
- C
75%
Why wrong: 75% is the rebinding time (T2), not renewal.
- D
87.5%
Why wrong: This is not a standard DHCP timer percentage.
Question 2,147 of 2,152
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). 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.
What is the default DHCPv4 renewal time (T1) as a percentage of the lease time?
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
✓
50%
The correct answer is B (50%) because RFC 2131 defines the DHCPv4 renewal time (T1) as 50% of the lease duration. When the T1 timer expires, the client attempts to renew its lease by sending a unicast DHCPREQUEST to the server that originally granted the lease.
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.
- ✗
25%
Why it's wrong here
25% is not the default; T1 is 50%.
- ✓
50%
Why this is correct
T1 is 50% of the lease time per RFC 2131.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
75%
Why it's wrong here
75% is the rebinding time (T2), not renewal.
- ✗
87.5%
Why it's wrong here
This is not a standard DHCP timer percentage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between T1 (renewal at 50%) and T2 (rebinding at 87.5%), and the trap here is that candidates confuse the two percentages or assume the renewal time is a higher value like 75%.
Detailed technical explanation
How to think about this question
Under the hood, the DHCP client uses two timers: T1 (renewal at 50% of lease time) and T2 (rebinding at 87.5% of lease time). If the client fails to renew by T1, it waits until T2 to broadcast a DHCPREQUEST to any server. This staggered approach ensures graceful lease management and reduces unnecessary broadcast traffic. In real-world scenarios, misconfiguring these timers can cause premature lease drops or excessive network chatter, especially in large enterprise environments with many clients.
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.
What to study next
Got this wrong? Here's your next step.
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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: 50% — The correct answer is B (50%) because RFC 2131 defines the DHCPv4 renewal time (T1) as 50% of the lease duration. When the T1 timer expires, the client attempts to renew its lease by sending a unicast DHCPREQUEST to the server that originally granted the lease.
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.
About these practice questions
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Last reviewed: Jul 4, 2026
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.
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