ZyXEL Communications NWA1000 Series, Руководство пользователя, Страница: 75 / 263

Chapter 9 Network
NWA1000 Series User’s Guide
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A Virtual Local Area Network (VLAN) allows a physical network to be partitioned into multiple logical
networks. Devices on a logical network belong to one group. A device can belong to more than one
group. With VLAN, a device cannot directly talk to or hear from devices that are not in the same
group(s); the traffic must first go through a router.
VLAN also increases network performance by limiting broadcasts to a smaller and more manageable
logical broadcast domain. In traditional switched environments, all broadcast packets go to each and
every individual port. With VLAN, all broadcasts are confined to a specific broadcast domain.
IEEE 802.1Q Tag
The IEEE 802.1Q standard defines an explicit VLAN tag in the MAC header to identify the VLAN
membership of a frame across bridges. A VLAN tag includes the 12-bit VLAN ID and 3-bit user priority.
The VLAN ID associates a frame with a specific VLAN and provides the information that devices need to
process the frame across the network.
Use this screen to configure the VLAN settings for your NWA1000 Series. To access this screen, click
Configuration > Network > VLAN .
The screen varies depending on whether the NWA1000 Series has an extra Ethernet port (except the
uplink port).
Figure 44 Configuration > Network > VLAN (for NWA1000 Series with multiple Ethernet ports)