vCenter 5.5 vApps and IP Pools

I am studying for the latest VMware 5.5 professional exam. For vApps, you can setup an IP pool to be transient or DHCP. I understand that transient IP relies on vCenter to act as a DHCP server instead of a network DHCP server. I do not understand when you would use a transient IP versus a network DHCP server?
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compdigit44Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You may not have a DHCP Server on that Virtual Machine Portgroup (or Virtual Machine Portgroup VLAN), and the use of Transients, is just supposed to be for Temporary purposes or testing.

Also these are very short term IP Addresses, because the lease time is based on the VM Powered On or OFF!

VM powered OFF, the IP Address is returned to the pool.

So if you main DHCP pool, is limited, and has a long lease time, you would not have enough IP Address.

Think Tiered DHCP services....
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compdigit44Author Commented:
Thanks for the clarification Andrew Hancock!!!!!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
No problem!
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