One of the Layer 2 attacks inside a LAN network that is very dangerous for information privacy and LAN integrity is spoofing attack.
This is special kind of attack where attacker can gain access to network traffic by spoofing responses that would be sent by a valid DHCP server. This attack is using a technique ARP spoofing, also called ARP cache poisoning or ARP poison routing (APR) that is a simple LAN attack technique. ARP spoofing will allow an attacker to intercept frames on a LAN, modify the traffic, stop the traffic or simply sniff all the traffic. This is possible because all the communication in LAN is now crossing attackers interface and this communication is vulnerable to packet sniffing.