Netgear GS716Tv3 – ProSAFE 16-Port Gigabit Managed Switch 管理者ガイド

Adding virtual LAN (VLAN) support to a Layer 2 switch offers some of the benefits of both 
bridging and routing. Like a bridge, a VLAN switch forwards traffic based on the Layer 2 
header, which is fast, and like a router, it partitions the network into logical segments, which 
provides better administration, security, and management of multicast traffic.

By default, all ports on the switch are in the same broadcast domain. VLANs electronically 
separate ports on the same switch into separate broadcast domains so that broadcast 
packets are not sent to all the ports on a single switch. When you use a VLAN, users can be 
grouped by logical function instead of physical location.

Each VLAN in a network has an associated VLAN ID, which displays in the IEEE 802.1Q tag 
in the Layer 2 header of packets transmitted on a VLAN. An end station can omit the tag, or 
the VLAN portion of the tag, in which case the first switch port to receive the packet can either 
reject it or insert a tag using its default VLAN ID. A given port can handle traffic for more than 
one VLAN, but it can support only one default VLAN ID.

For more information about configuring VLANs, see 

The VLAN menu contains links described in the following sections.