mediumMultiple Choice
300-410 Practice Question: The default DHCPv4 renewal time (T1) as a…
What is the default DHCPv4 renewal time (T1) as a percentage of the lease time?
⚠ Common exam trap
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%.
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%
(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.
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
T1 is 50% of the lease time, not 25%. A quarter of the lease is the tempting figure because it feels like an early checkpoint, but the DHCP RFC specifies T1 at half the lease, with T2 at 87.5%.
- ✓
50%
Why this is correct
DHCPv4 clients renew at T1, which defaults to 50% of the lease duration, unicasting a REQUEST to the original server. This satisfies the stem's percentage constraint; T2 defaults to 87.5% and triggers rebinding broadcast if renewal fails.
- ✗
75%
Why it's wrong here
75% is neither T1 nor T2. It is tempting as a three-quarter mark between renewal and rebinding, but T1 defaults to 50% of the lease and T2 to 87.5%, so 75% matches no DHCP timer.
- ✗
87.5%
Why it's wrong here
87.5% is the default rebinding time (T2), not the renewal time (T1), so it answers a different timer than the one requested. It is tempting because T2 is also expressed as a percentage of lease duration, and 87.5% would be the correct choice if the question asked for the rebinding timer.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.