How to Configure a Router to Obtain an IPv4 Address Automatically from an ISP using DHCP

Which command, when issued in the interface configuration mode of a router, enables the interface to acquire an IPv4 address automatically from an ISP, when that link to the ISP is enabled?

To enable the interface of a router to acquire an IPv4 address automatically from an ISP, we would use the “ip address dhcp” command in the interface configuration mode.

This command will configure the interface to obtain an IPv4 address dynamically from a DHCP (Dynamic Host Configuration Protocol) server, which is typically provided by the ISP.

Here are the steps to enable this feature:

1. Enter the global configuration mode of the router by typing “configure terminal” or “conf t”.

2. Access the interface configuration mode for the interface connected to the ISP by using the command “interface “. For example, if the interface is GigabitEthernet0/0, you would enter “interface GigabitEthernet0/0”.

3. Once in the interface configuration mode, issue the “ip address dhcp” command to enable the interface to acquire an IPv4 address dynamically from the ISP. The command will look like this: “ip address dhcp”.

4. Optionally, you can also configure the interface to obtain other required settings from the DHCP server, such as the default gateway and DNS servers. You can do this by using the “ip address dhcp” command along with other relevant parameters. For example, “ip address dhcp” can be followed by “dhcp client hostname ” to set the hostname provided by DHCP.

5. Exit the interface configuration mode by entering “exit” or pressing Ctrl+Z.

6. Save the configuration changes by typing “copy running-config startup-config”.

With these steps, the interface of the router will acquire an IPv4 address automatically from the ISP when the link to the ISP is enabled.

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