During the initial setup of a Catalyst 9300 switch you run the command show vlan brief and notice that every interface is listed under VLAN 1 (default). Regarding this default VLAN on Cisco switches, which statement is correct?
It is assigned by default to all ports and cannot be deleted.
The default VLAN on Cisco switches is VLAN 1. All switch ports belong to VLAN 1 out of the box, and VLAN 1 cannot be deleted from the VLAN database. Control protocols such as CDP, STP, VTP, and DTP are always carried on VLAN 1, even if user traffic is pruned. Voice traffic is normally placed in a separate voice VLAN; security best practices advise keeping user data off VLAN 1, but the VLAN itself cannot be removed; and VLAN 1 is not limited to management-only traffic unless you explicitly configure it that way.
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What is CDP and why does it use the default VLAN?
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What is STP and how does it interact with VLAN 1?
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Cisco CCNA 200-301
Network Access
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