What is the default VLAN for Cisco LAN switches?

The default VLAN for Cisco LAN switches is VLAN 1. This VLAN is created by default on all Cisco switches and is used for management traffic unless specifically changed by the network administrator. It serves as the primary VLAN for untagged traffic and is essential for various switch management functionalities, such as SSH, Telnet, and the transfer of spanning tree protocol (STP) messages.

In practice, VLAN 1 is often a concern for network security; many administrators opt to configure their networks to use different VLANs for management purposes to mitigate risks associated with potential attacks targeting the default configurations. The other VLANs listed are not defaults on Cisco switches, and they typically need to be manually created and configured.