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I've been playing around with Packet Tracer setting up DHCP on a router, in which I have no issues. But being curious has me stump now. I have a LAN consisting of two clients a server and a switch. Can I configure DHCP using the server without any router present in my network topology? Can I use a default gateway other than 0.0.0.0 if I'm not using a router? Is there any scenario where a router is need if DHCP is being ran off a server in the topology discussed above.

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Can I configure DHCP using the server without any router present in my network topology?

You don't need a router to run DHCP. In fact, it is much more common to run DHCP on a server than a router.

Can I use a default gateway other than 0.0.0.0 if I'm not using a router?

If you have no routers in your network, then you don't need a default gateway -- there's nowhere to route to.

Is there any scenario where a router is need if DHCP is being ran off a server in the topology discussed above.

You need a router if you have to route between networks. That is completely independent of the use of DHCP.

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