I want to reserve a static IP address on my Airport extreme.  What is the difference between reserving by MAC Address and DHCP Client ID?

I want to understand the differences in the way you can reserve a static address for a device on the network.  I had previously set the device itself to an address and then reserved it with DHCP Client ID, which I thought was just the devices static addresss.  I'm not sure if this was in fact correct or just happend to work.  I know what a MAC address is, but I'm not really sure what the DHCP Client ID is. So it would be great if someone could clarify it, and the difference between reserving address by MAC Address or DHCP Client ID.

A MAC address is a unique identification consisting of letters and numbers in a form that looks like this:
xx:xx:xx:xx:xx:xx
Every network device has a MAC address, which can be found on a label on the bottom or back of the device. Apple calls this the Ethernet ID.
A DHCP Client ID is an optional name that you can assign to a device. For example, on your Mac....
Open System Preferences (gear icon on the dock)
Open Network
Click on Ethernet
Click Advanced at the lower right
You may be able to edit the DHCP Client  ID here....for example.....you could enter MJ500's MacBook in the space provided. That would be the Client ID of your Mac.

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