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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
25% is not the default; T1 is 50%.
- ✓
50%
Why this is correct
T1 is 50% of the lease time per RFC 2131.
- ✗
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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