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Layer 2 Security: DHCP Snooping and Dynamic ARP Inspection

Layer 2 Security: DHCP Snooping and Dynamic ARP Inspection Provides a detailed, technical explanation and hands-on lab scenario demonstrating how to mitigate various Layer 2 network attacks, focusing heavily on security features applied at the access layer switch. Initially, the text illustrates a DHCP starvation attack using a rogue DHCP server, explaining how an attacker can exhaust the legitimate IP address pool and assign malicious addresses. The primary defense mechanism introduced is DHCP Snooping, which acts as a firewall to designate trusted and untrusted switch ports to prevent unauthorized DHCP responses. Following this, the text addresses ARP Poisoning (or Spoofing), detailing the process of a man-in-the-middle (MITM) attack where an attacker manipulates the Address Resolution Protocol table. To counteract this, the source then introduces and configures Dynamic ARP Inspection (DAI), which relies on the DHCP snooping database to validate ARP packets and block malicious traffic. Finally, the text briefly lists future security topics, including MAC Flooding Attack and Port Security.