For example we dont know which dhcp server provided

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For example, we don't know which DHCP server provided this IPv4 address. We also don't know what the DNS server address is. So how do you view that information? You actually have to run the IP config command and use the Forward/All option with the command. This will cause the ipconfig command to display extended information about the network adapter. I'm going to go ahead and press Enter. Now you'll notice that a lot more information is displayed. Let's scroll up just a little bit here. First of all, under the windows IP configuration we can now see the host name of the system.This system is named Win10. Here's our DNS suffix which we saw before. Scrolling down we also see the DNS suffix which is eastsim.com. We also see the type of Ethernet hardware that's installed in the system to create this network connection. It's an Intel82574L gigabit Ethernet network connection. We also see the MAC address of this network adapter. We see that DHCP is enabled. Now we see some of the same information that we saw before as well. We see the IP address, we see the Subnet mask, and we see the default gateway router address that we
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saw with just the DHCP command alone, but notice that we see a lot more information about the DHCP lease. For example, we see the date and time that the DHCP lease was created, today at 10:23AM and it's going to expire at some point. So at 12:14PM this lease is going to expire, in which case this system will have to contact the DHCP server and renew the lease so that it can keep using this IP address. Also notice that we now see the IP address of the DHCP server that provided this lease. It also has an IP address of 10.0.0.1 and we also see the IP address of the DNS server that's going to be used by this work station as well. To resolve DNS names into IP addresses as you can see that the config /all command provides a lot more information than just ipconfig alone. Now there's more you can do with ipconfig besides just view information. Now remember earlier I said that this system is configured to use DHCP therefore when the adapter comes online it's going to contact the DHCP server and establish a DHCP lease. Well we can use the ipconfig command to actually release the current DHCP lease that it received from the DHCP serverto do this you type ipconfig like we did before. This time use the release option. I hit enter, you'll notice that we lose our IP addressing information, we no longer have an IP address assigned to the system. We don't have a subnet mask, we don't have a default gateway router address, we don't have a DNS server address anymore either and you can tell that down here by the networking icon, notice that we have a yellow triangle with an exclamation point indicating that we don't have any addressinginformation and we have no internet access anymore.
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