With Wireshark, we can start sniffing the network in promiscuous mode. If we don’t have access to a GUI, we can run a simple tcpdump if we are on linux, or netsh on Windows but that’s trickier.
The traffic we see can help us get an idea of what’s going on in the network, such as which hosts are present and the protocols being used for communications.
Filtering for ARP, MDNS or DHCP traffic can reveal to us IPs and their associated Hostnames and MACs.