What is the deference between a lease and a reservation on a DHCP server?

What is the deference between a lease and a reservation on a DHCP server?
BeltValleyAsked:
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cuziyqConnect With a Mentor Commented:
A lease is when your DHCP server hands out an IP address to a client.  It only gets that IP address for a specified amount of time, after which the client must re-apply for a new one (the DHCP server decides whether or not it gets to keep it or assign it a different one).

A reservation is when you want to guarantee a specific IP address to a specific machine.  The DHCP server will never assign that reservation to any other computer than the one it is reserved for.

So why wouldn't you just give that machine a static address you might ask?

Simple:  It allows an organization to use what I call "dynamically static" (or possible statically dynamic?) addresses.  If you use static addressing, each machine must be configured with a unique IP address locally on the box.  Using a DHCP server to create reservations for every MAC address you want a static address for centralizes the administration of those IP addresses.  You simply set each client to use DHCP and leave it at that.  When you need to change/add/remove an IP address, you simply do it on the DHCP server rather than physically going to the machine in question (or remoting into it).
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