Default VLAN IDs

BC

VLAN 1 is a system default VLAN, you can use this VLAN but you cannot delete it. By default VLAN 1 is use for every port on the switch.

Standard VLAN range from 1002-1005 it's Cisco default for FDDI and Token Ring. You cannot delete VLANs 1002-1005. Mostly we don't use VLAN in this range.

The default VLAN is the VLAN to which all switch ports are assigned by default when they are first initialized. It is also known as the native VLAN, untagged VLAN or the management VLAN.

In Cisco switches, the default VLAN ID is either VLAN 1 or VLAN 1002-1005, depending on the switch model and software version.

Therefore, the correct answer to the question "Which two VLAN IDs indicate a default VLAN?" are:

B. VLAN 1 is the default VLAN ID for most Cisco switches. This VLAN is automatically created and all switch ports are assigned to it by default. VLAN 1 is typically used for management purposes, and should not be used for data traffic.

C. VLANs 1002-1005 are reserved VLANs that are created by default on all Cisco switches. VLAN 1002 is reserved for FDDI-Default; VLAN 1003 is reserved for Token Ring-Default; VLAN 1004 is reserved for FDDI-Secondary; and VLAN 1005 is reserved for Token Ring-Secondary. These VLANs cannot be deleted, but can be modified to include or exclude specific ports.

Therefore, the correct answers to the question are B and C. VLANs 0, 1006, and 4096 are not valid VLAN IDs and cannot be used as default VLANs.