Final answer:
Sniffing on a switched network is known as active sniffing, specifically ARP spoofing, where the attacker associates their MAC address with the IP address of a legitimate device to intercept traffic.
Step-by-step explanation:
Sniffing performed on a switched network is called ARP poisoning or ARP spoofing. It is a form of active sniffing where the attacker sends falsified ARP (Address Resolution Protocol) messages over a local area network. This results in the linking of an attacker's MAC address with the IP address of a legitimate computer or server on the network. Once the attacker has the traffic directed to their MAC address, they can begin sniffing packets
Passive sniffing is when an attacker captures traffic on a network that is not switched, usually a hub-based one, where traffic is sent to all ports. In contrast, active sniffing involves actions that will induce traffic to be sent to a particular port on a switch.