What is the problem with the network in Figure 2-16?
Two issues in this network need attention. The most critical problem is that two ports on the Catalyst, which belong to different VLANs, attach to a standard bridge. This merges the two VLANs into a common broadcast domain and defeats the purpose of the Catalyst having two or more broadcast domains.
An additional issue involves Spanning Tree. Although Spanning Tree is not discussed until Chapters 6 and 7, a loop exists in VLAN 1. This might be intentional for resiliency and can be controlled by Spanning Tree. But if unintentional, it can force your network to transmit frames over a less desirable path than you might expect.