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DHCP Relay is a feature used in networks where DHCP servers are not located on the same subnet as the DHCP clients. It allows DHCP clients to obtain IP addresses and other network configuration information even when the DHCP server is on a different subnet.

VLANs are a fundamental concept in networking that allows you to segment a physical network into multiple logical networks. This segmentation provides various benefits such as improved security, better network performance, and simplified management.

OSPF is a routing protocol used in computer networks, particularly within large enterprise networks and internet service provider networks. It is one of the most widely used IGP and is designed to efficiently determine the best route for data packets through a complex network.

ACLs are a fundamental concept in computer security and networking. They are essentially lists of permissions attached to objects that specify which users or system processes are granted access to objects, as well as what operations are allowed on given objects.