A virtual LAN, commonly known as a vLAN or as a VLAN, is a method of creating independent logical networks within a physical network. Several VLANs can co-exist within such a network. This helps in reducing the broadcast domain.
A VLAN consists of a network of computers that behave as if connected to the same wire - even though they may actually be physically connected to different segments of a LAN. VLANs are configured through software rather than hardware, which makes them extremely flexible. One of the biggest advantages of VLANs emerges when physically moving a computer to another location: it can stay on the same VLAN without the need for any hardware reconfiguration.
The CS department network uses a number of VLANS to create logical networks based on different host types and groups of people. The VLANS make management easier and also allow for rules to be put in place to protect VLANS from other VLANS. If you would like more information on the CS VLAN configuration please email csstaff@cs.princeton.edu.