VLAN Trunk Protocol (VTP)
Before we go any further, let's discuss a feature that will help us manage VLANs in an ever expanding LAN network - VLAN Trunk Protocol, or simply, VTP.
This is one of my favorite interview questions before when I'm still conducting applicant interviews. Most will answer that it has something to do with Trunk configuration and management, rather than with VLANs. But that's just until they get smarter. =P
Moving forward, just imagine configuring and managing a new network with around 100 Catalyst Switches. To complicate the configuration a bit, every Switch needs to be configured with 100 VLANs. Imagine doing that repetitively on all 100 Switches. Hard right? =)