Introduction To Vlans - ZyXEL Communications VES1724-56 User Manual

Chapter 8 Basic Setting
Table 11 Basic Setting > General Setup (continued)
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8.4 Introduction to VLANs

A VLAN (Virtual Local Area Network) 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.
In MTU (Multi-Tenant Unit) applications, VLAN is vital in providing isolation and security among the
subscribers. When properly configured, VLAN prevents one subscriber from accessing the network
resources of another on the same LAN, thus a user will not see the printers and hard disks of
another user in the same building.
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.
Note: VLAN is unidirectional; it only governs outgoing traffic.
See Chapter 10 on page 129
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DESCRIPTION
Configure the day and time when Daylight Saving Time ends if you selected Daylight
Saving Time. The time field uses the 24 hour format. Here are a couple of examples:
Daylight Saving Time ends in the United States on the first Sunday of November. Each time
zone in the United States stops using Daylight Saving Time at 2 A.M. local time. So in the
United States you would select First, Sunday, November and 2:00.
Daylight Saving Time ends in the European Union on the last Sunday of October. All of the
time zones in the European Union stop using Daylight Saving Time at the same moment (1
A.M. GMT or UTC). So in the European Union you would select Last, Sunday, October and
the last field depends on your time zone. In Germany for instance, you would select 2:00
because Germany's time zone is one hour ahead of GMT or UTC (GMT+1).
Click Apply to save your changes to the Switch's run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Save link on the top navigation panel
to save your changes to the non-volatile memory when you are done configuring.
Click Cancel to begin configuring this screen afresh.
for information on port-based and 802.1Q tagged VLANs.
VES1724-56 User's Guide