Users Guide

1142 DHCP Server Settings
DHCP relay for relaying IPv4 address assignments from network-based
DHCP servers to clients in the same or different subnets, and DHCP
snooping for protecting the switch and DHCP clients from certain security
risks.
How Does DHCP Work?
When a host connects to the network, the host’s DHCP client broadcasts a
message requesting information from any DHCP server that receives the
broadcast. One or more DHCP servers respond to the request. The response
includes the requested information, such as the IP address, subnet mask, and
default gateway IP address. The client accepts an offer from one of the
servers, and the server sends an acknowledgment to the client to confirm the
transaction.
Figure 31-1. Message Exchange Between DHCP Client and Server
The DHCP server maintains one or more set of IP addresses the and other
configuration information available, by request, to DHCP clients. Each set of
information is known as an address pool.
After a client leases an IP address from the DHCP server, the server adds an
entry to its database. The entry is called a binding.
What are DHCP Options?
DHCP options are collections of data with type codes that indicate how the
options should be used. Options can specify information that is required for
the DHCP protocol, IP stack configuration parameters for the client,
information allowing the client to rendezvous with DHCP servers, and so on.
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DHCPDISCOVER (broadcast)
DHCPOFFER (unicast)
DHCPREQUEST (broadcast)
DHCPACK (unicast)
DHCP Client DHCP Server
(Dell EMC Networking
N-Series switch)