When starting up a Mountain Lion iMac, it takes along time before network logins are available.

When starting up a Mountain Lion iMac, it takes along time before network logins are available. There seems to be a huge delay getting the network up and running, and I'm not sure why. This isn't an issue for identical iMacs running Snow Leopard.
If I login with a local account, I see the ethernet registered as disconnected for at least a minute, then it pops up. If I switch to Snow Leopard, using the exact same hardware, network cable, jack, etc, it's instant.
Has anybody encountered anything similar?

Fulcrum Media wrote:
Has anybody encountered anything similar?
No. I have a rMBP and a Mac Mini on a home LAN. The Mac Mini is connected via ethernet and the rMBP is WiFi. Both connect instantly to my network. Both are running OS X Mountain Lion 10.8.2.

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