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the two. If you have many vlans spread over different geographic areas,
it may not make sense to stretch the vlan to each the dhcp server. In
that case a combination may work well, where local vlans are trunked to
the dhcp server, and remote ones are forwarded using dhcp relays.

If you can locate a copy, "The DHCP Handbook", second edition by Ralph
Droms and Ted Lemon gives a lot of good background and theory on dhcp.
It is well worth reading.

There are also documents supplied with the ISD dhcpd distrobution, the
man pages for dhcpd.conf, dhcp-options, dhcp-eval, and dhcpd are worth
printing and reading. There is about 100 pages in total, so there is
quite a comprehensive set of documentation there. In the doc directory
of the source distribution are links to various RFCs which define the
theoretical operation of various aspects of dhcp.

I hope this helps, please keep asking questions if anything is not
clear.

regards,
-glenn