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When OSPF and BGP both know about the same prefix, who wins? A practical walkthrough of mutual redistribution, the admin-distance trap, and why BGP into OSPF needs a filter or it takes down your domain.

The CCNA exam covers wireless security at a concept level. WPA2 has been the dominant Wi-Fi security standard since 2004;

IPsec is the suite of protocols that builds encrypted, authenticated tunnels across untrusted networks. Two routers at different sites establish

DHCP snooping watches DHCP traffic on a switch and builds a binding table of legitimate IP-MAC-port mappings. Dynamic ARP Inspection

802.1X is the IEEE standard for port-based network access control. A switch port stays closed until the device on

AAA - Authentication, Authorization, Accounting - is the framework that lets centralized servers (TACACS+ or RADIUS) handle login validation, command