By allowing users to be grouped by department, type of user, or virtually any other criteria, VLANs can be a great asset to network administrators and managers. Learn how with this new and improved VLANs crash
A virtual (or logical) LAN is a local area network with a definition that maps workstations on some other basis than geographic location (for example, by department, type of user, or primary application). The virtual LAN controller can change or add workstations and manage loadbalancing and bandwidth allocation more easily than with a physical picture of the LAN. Network management software keeps track of relating the virtual picture of the local area network with the actual physical picture.
Expert Chris Partsenidis runs down the basics of virtual LANs.
VLAN attacks and how to avoid them
Learn how to secure a VLAN from popular attacks such as the VLAN hopping attack.
Lippis Report Volume 44: Secure domains and VLANs
Segmenting networks into security domains will become increasingly important as networks move toward a trusted model.
Read more VLAN-related tips here.
ASK THE EXPERTS
a VLAN help secure my small network?
Expert response: Setting up a VLAN for such a small home office network would be very expensive in terms of hardware and setup required...
kind of security is available for VLANs?
Expert response: High-security users can be grouped into a VLAN, possibly on the same physical segment, and no users outside of that VLAN can communicate with them...
Ask one of our experts your VLAN-related questions.
WEBCASTS & WHITE PAPERS
This whitepaper discusses VLAN challenges, best practices, tagging and tagging technologies, maintaining VLANs and how good documentation practices will help troubleshoot problems and optimize VLAN performance.
LAN security best practices
The purpose of this paper is to present in a comprehensive way all of the recommendations that Cisco engineers have accumulated to aid with the proper configuration of VLANs on Cisco switches.
field manual: Catalyst switch configuration -- VLANs and trunking
This excerpt from the book "Cisco Field Manual: Catalyst Switch Configuration," by David Hucaby and Steve McQuerry, focuses on virtual local area networks (VLANs). Learn about VLAN configuration, port membership, trunking methods and protocols.
This was first published in August 2005