Which command is used to renew DHCP leases in a Windows environment?

The command used to renew DHCP leases in a Windows environment is indeed ipconfig /renew. When a device is configured to obtain an IP address automatically via DHCP (Dynamic Host Configuration Protocol), it periodically needs to renew its lease on that IP address to maintain network connectivity.

Running the command ipconfig /renew prompts the computer to send a request to the DHCP server for a new lease or to renew the existing lease on its current IP address. This process is essential for ensuring that the device continues to retain valid network settings, especially in environments where IP addresses may be allocated dynamically.

In contrast, other commands listed serve different purposes. The ipconfig /release command is used to release the current DHCP lease, effectively dropping the IP address assigned by the DHCP server. The ipconfig /flushdns command clears the DNS resolver cache, which does not relate to DHCP leases. Lastly, ipconfig /all provides detailed information about the network configuration, including current DHCP settings, but does not perform any action to renew leases. Thus, for renewing DHCP leases, ipconfig /renew is the correct choice.