D-Link DES-2108/E Инструкция по эксплуатации онлайн [52/199] 40199

D-Link DES-2110 Инструкция по эксплуатации онлайн [52/199] 40188
24-port NWay Ethernet Switch User’s Guide
38 Switch Management
VLAN
VLANs are a collection of users or ports grouped together in a
secure, autonomous broadcast and multicast domain. Membership
to a VLAN is not restricted by a physical location and can be
defined across multiple LAN switches.
Two types of VLANs are implemented: MAC-based VLANs and
port-based VLANs. MAC-based VLANs are limited to the switch
and the devices connected to it, while port-based VLANs support
IEEE 802.1Q tagging, which enables them to span the entire
network (assuming all switches on the network are IEEE 802.1Q-
compliant).
Both MAC-based and port-based VLANs allow a network to be
segmented in order to reduce the size of broadcast domains. All
packets entering a VLAN will only be forwarded to the stations
(MAC-based) or ports (port-based) that are members of that VLAN,
and this even includes Multicast frames and unknown unicast
frames.
Another benefit of VLANs is that you can change the network
topology without physically moving stations or changing cable
connections. Stations can be ‘moved’ simply by changing VLAN
settings from one VLAN (the sales VLAN, for example) to another
VLAN (the marketing VLAN). This allows VLANs to accommodate
network moves, changes and additions with the utmost flexibility.
VLANs can also provide a level of security to your network. MAC-
based VLANs will only deliver packets between stations that are
members of the VLAN. Port-based VLANs allow you to configure
ports to not accept packets from outside of the VLAN.
The untagging feature of IEEE 802.1Q VLANs allow VLANs to
work with legacy switches that don’t recognize VLAN tags in
packet headers. The tagging feature allows VLANs to span
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