A DHCP client host holding an active IPv4 address lease reaches 50 percent of its designated lease duration (expiration of the T1 timer). In what sequence do the client and server execute the operational steps required to successfully renew the existing IP lease?
- 1The client transitions to the RENEWING state and transmits a unicast DHCPREQUEST message directly to the IP address of the leasing DHCP server.
- 2The DHCP server validates the active lease binding, updates the lease expiration time, and transmits a unicast DHCPACK message to the client.
- 3The client receives the DHCPACK message and resets both its T1 (50%) and T2 (87.5%) lease timers based on the refreshed parameters.
- 4The client transitions back to the BOUND state, maintaining uninterrupted operation with its existing IP configuration.
Answer
The correct operational sequence for DHCP lease renewal at T1 timer expiration is: 1) The client transitions to the RENEWING state and sends a unicast DHCPREQUEST directly to the server; 2) The DHCP server updates the lease entry and sends a unicast DHCPACK; 3) The client processes the DHCPACK and resets its T1 and T2 timers; 4) The client transitions back to the BOUND state.
When a DHCP client reaches 50 percent of its lease duration (T1 timer), it transitions into the RENEWING state and sends a unicast DHCPREQUEST packet directly to the server that granted the lease. The server receives the request, updates its binding table, and replies with a unicast DHCPACK. Upon receiving the DHCPACK, the client resets both its T1 and T2 timers and returns to the BOUND state, ensuring seamless network access.
Step-by-Step Solution
Key Concept
DHCP Client State Machine and Unicast Lease Renewal (T1 Timer)