I connect a D-Link switch to a port on a Cisco switch which is of 2960 family, i.e. layer II. The Cisco switch is configured as VTP
client to receive VLAN configuration from a VTP
I expect that the D-Link won't work unless I configure the port/interface on Cisco switch and assign a VLAN to that port/interface in the
However, to my surprise, the D-Link switch works fine out of the box, without any interface configuration on Cisco switch. I mean, when I connect computers to D-Link switch, they recognize the network and are able to communicate on the network.
Why is that? Why does D-Link switch work fine by just connecting it to any random port/interface on the Cisco switch? What should I do to prevent that and improve security?