, the oldest, slowest switch in the basement had elected itself the "Root Bridge," bottlenecking the entire 10Gbps fiber backbone. With a few commands— spanning-tree vlan 1-100 root primary

First, a quick clarification: The official Cisco NetAcad curriculum for (Switching, Routing, and Wireless Essentials) includes several Case Studies depending on the instructor or region — but the most common “Rev B” case study focuses on multi-switch configuration, VLANs, trunking, STP, EtherChannel, and inter-VLAN routing , often using Packet Tracer .

: Encrypt all passwords, set a minimum password length (often 10 characters), and disable IP domain lookups.

The case study - Rev B is a revised version of the original case study, which was updated to reflect the latest network technologies and industry trends. The case study is designed to evaluate a candidate's ability to apply theoretical knowledge to practical scenarios, making it an essential component of the CCNA certification process.

interface g0/0.10 encapsulation dot1Q 10 ip address 192.168.10.1 255.255.255.0 interface g0/0.20 encapsulation dot1Q 20 ip address 192.168.20.1 255.255.255.0 interface g0/0.99 encapsulation dot1Q 99 native ip address 192.168.99.1 255.255.255.0