Implementing Cisco Network Security (IINS v3.0) (#197)

What is a potential drawback to leaving VLAN 1 as the native VLAN?

It may be susceptible to a VLAN hoping attack.
Gratuitous ARPs might be able to conduct a man-in-the-middle attack.
The CAM might be overloaded, effectively turning the switch into a hub.
VLAN 1 might be vulnerable to IP address spoofing.