Segment security provides stateless Layer2 and Layer 3 security by checking the ingress traffic to the segment and dropping unauthorized packets sent from VMs by matching the IP address, MAC address, and protocols to a set of allowed addresses and protocols. You can use segment security to protect the segment integrity by filtering out malicious attacks from the VMs in the network.
Note that the default segment security profile has the DHCP settings Server Block and Server Block - IPv6 enabled. This means that a segment that uses the default segment security profile will block traffic from a DHCP server to a DHCP client. If you want a segment that allows DHCP server traffic, you must create a custom segment security profile for the segment.