Short answer: No, VLANs and router by default don’t forward broadcast or ARP Requests to devices outside of their network. Yes, Layer 2 switches , do forward broadcast and ARP Requests.
Explanation: VLANs and router create and represent separate broadcast domains. A broadcast domain is a logical division of a computer network where all devices can communicate with each other by sending broadcast messages at the data link layer (Layer 2 of the OSI model). This means that any broadcast sent by a device within this domain is received by all other devices in the same domain, but not by devices in different broadcast domains. Typically, all devices connected to the same Ethernet switch or hub are part of the same broadcast domain, while routers separate different broadcast domains to manage traffic and reduce congestion.
