DHCP snooping is a security feature implemented on Layer 2 switches that provides protection against various security threats and attacks, primarily related to rogue DHCP servers and DHCP-based attacks. Some of the key threats that DHCP snooping protects against include the following: Rogue DHCP Servers: DHCP snooping prevents rogue or unauthorized DHCP servers from distributing malicious or incorrect network configuration information to clients. By filtering DHCP messages on untrusted ports, DHCP snooping ensures that clients receive valid configurations only from authorized DHCP servers. Man-in-the-Middle Attacks: In this type of attack, an attacker intercepts and potentially alters the communication between two parties. Rogue DHCP servers can be used to perform man-in-the-middle attacks by providing clients with an incorrect gateway or DNS server information, redirecting their network traffic through the attacker's device. DHCP Starvation Attacks: An attacker can flood a DHCP server with numerous DHCPDISCOVER requests, consuming all available IP addresses in the DHCP pool and preventing legitimate clients from obtaining IP addresses. DHCP snooping can limit the rate of DHCP messages received on untrusted ports, mitigating the impact of DHCP starvation attacks. IP Spoofing: DHCP snooping maintains a binding database of IP-MAC address pairs, which can be used by other security features like IP Source Guard and Dynamic ARP Inspection to prevent IP spoofing attacks. By ensuring that only legitimate devices with valid IP-MAC address bindings can send traffic on the network, DHCP snooping helps prevent attackers from impersonating other devices. ARP Poisoning: Although DHCP snooping doesn't directly protect against ARP poisoning, it plays a crucial role in enabling Dynamic ARP Inspection (DAI), which does. DAI relies on the DHCP snooping binding database to validate the legitimacy of ARP packets and prevent ARP cache poisoning. In summary, DHCP snooping helps protect against various network threats and attacks, primarily rogue DHCP servers, by monitoring and filtering DHCP messages on untrusted ports, maintaining a binding database, and facilitating other security features like DAI and IP Source Guard.