An attacker provides false IP configurations to clients, often leading to Man-in-the-Middle (MITM) attacks.
Create a "trust" boundary where only legitimate DHCP servers can provide IP addresses.
While most security focuses on Layers 3 through 7, the Data Link Layer (Layer 2) remains a critical yet often overlooked vulnerability surface. This paper outlines the primary attack vectors—including MAC flooding, DHCP spoofing, and VLAN hopping—and provides a framework for multi-layered defense strategies in switched Ethernet environments. 1. Common Layer 2 Vulnerabilities Understanding, Preventing, and Defending Agains...
Implementing port-based network access control to ensure only authenticated devices can join the network. Conclusion
Validate ARP packets against the DHCP snooping binding database to prevent spoofing. 3. Advanced Defense Mechanisms An attacker provides false IP configurations to clients,
Poisoning ARP caches to redirect traffic to the attacker’s machine. 2. Prevention and Mitigation Strategies
This title typically refers to a widely recognized technical presentation by for Cisco Networkers/Cisco Live, titled "Understanding, Preventing, and Defending Against Layer 2 Attacks" . Conclusion Validate ARP packets against the DHCP snooping
Securing Layer 2 is the first line of defense in a "defense-in-depth" architecture. By hardening switch ports, managing VLANs strictly, and utilizing protocols like DHCP Snooping and DAI, administrators can significantly reduce the risk of internal network compromise.