M10 - Layer 2 Security & Network Hardening - Cisco CCNA Routing & Switching скачать в хорошем качестве

M10 - Layer 2 Security & Network Hardening - Cisco CCNA Routing & Switching

Learn how to secure your network from the inside out with essential hardening techniques and Layer 2 defense strategies. In this video, we explore the AAA framework—Authentication, Authorization, and Accounting—and how it controls user identity, access, and activity across the network. You’ll see why Layer 2 is considered the “soft underbelly” of network security and how a compromise at this level can expose higher-layer services. We cover key protective measures such as server-based 802.1X authentication using TACACS+ or RADIUS, and why insecure management protocols like Telnet and HTTP should be replaced with SSH and HTTPS. The video also examines common Layer 2 attacks, including MAC flooding, DHCP starvation, and ARP poisoning, along with Cisco mitigation features like port security, DHCP snooping, and Dynamic ARP Inspection. Ideal for CCNA students and IT learners, this lesson provides a practical overview of foundational network security.