important to understand with DHCP servers now most the ATP servers they normally get out early so about seven days and this is a good the fall on what you have to 400-101 DHCP lease arm the more network traffic you have just with stupid things like Daft I but it means that will last a I addresses are being used by computers that may not be on the network where the longer the IP address that the more IP addresses get used up arm but the less traffic on the network that’s kind of something that you're your . http://400-101cisco.com/