Black Box LB9030A-R2, Руководство пользователя

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Broadcast Containment
In traditional networks, traffic broadcasts to all network
devices, whether they are the intended recipients or not.
However, VLANs can be set up to contain only those devices
that need to communicate with each other. As a result,
VLANs significantly reduce network congestion. In addition,
VLANs prevent broadcast storms from causing network
meltdown due to volumes of traffic.
Multicast-Based Multimedia Applications
Multimedia applications, such as interactive training, video
conferencing, and news-video transmissions, require large
amounts of bandwidth. These applications are also extremely
sensitive to variable delays, which are unavoidable on a
shared Ethernet network. By defining a VLAN based on the IP
multicast address for all subscribing members on the VLAN,
sufficient bandwidth will be available for these application,
providing true multimedia on Ethernet.
Enhanced Security
Because VLANs are self-contained, only the devices within
the same VLAN can communicate with each other. If a device
in one VLAN wants to communicate with a device in another
VLAN, the traffic must go through a router.