SRX Series device can act as a DHCP client, DHCP server, and DHCP relay agent at the same time, but you cannot configure more than one DHCP role on a single interface.

J-Web Configuration
To configure an SRX Series device to act as a DHCP clien…
http://www.ebrahma.com/2014/01/configure-dhcp-client-in-juniper-srx-device/

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