The DHCP server leases IP addresses 10.162.233.158 to WBAC11 for a period of 14 days. At which of the following times would WBAC11 send an initial request to the DHCP server to renew the IP address…

The correct answer is C. Day 8. Per RFC 2131, a DHCP client attempts its first lease renewal at 50% of the total lease duration (the T1 timer). For a 14-day lease, 50% is 7 days. If the lease is issued at the beginning of Day 1, adding 7 days places the first renewal attempt at the start of Day 8. Day 4…

Networking concepts

Question

The DHCP server leases IP addresses 10.162.233.158 to WBAC11 for a period of 14 days. At which of the following times would WBAC11 send an initial request to the DHCP server to renew the IP address lease?

Options

ADay 4
BDay 6
CDay 8
DDay 10

How the community answered

(34 responses)

A
6% (2)
B
3% (1)
C
91% (31)

Explanation

Per RFC 2131, a DHCP client attempts its first lease renewal at 50% of the total lease duration (the T1 timer). For a 14-day lease, 50% is 7 days. If the lease is issued at the beginning of Day 1, adding 7 days places the first renewal attempt at the start of Day 8. Day 4 (choice A) represents roughly 25% of the lease. Day 6 (choice B) is about 43%. Day 10 (choice D) represents roughly 64%, which is closer to the T2 timer (87.5% of lease time) used for the second rebinding attempt if the first renewal fails. Day 8 correctly reflects the 50% T1 renewal trigger for a 14-day lease.

Topics

#DHCP lease renewal#T1 timer#lease time#IP addressing

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