How to restrict the broadcast domain?
Since a broadcast domain is the area where broadcasts can be received, broadcasts are restricted by routers. If a router receives a broadcast signal, it simply drops it. In other words, the edge or border router connected to the Internet will not up-broadcast or will not relay that broadcast message. This is problematic and not foolproof either. Supposing two networks exist and they’re connected to each other through a router. The first network has a running DHCP server that offers IP addresses to networked systems. On the other side, there is no valid DHCP server running on the second network. Offering IP addresses from the first network’s DHCP server to the second network’s systems can be a difficult task to accomplish since DHCP is a broadcast, and the router that joins the networks drops the broadcast traffic. This leaves any DHCP request in the second network, unanswered. Many router manufacturers provide capabilities for DHCP forwarding to solve this problem. This can be bypassed
