Installation manual

Glossary-3
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IEEE 802.1X
Port Authentication controls access to the switch ports by requiring users to first enter a
user ID and password for authentication.
IEEE 802.3ac
Defines frame extensions for VLAN tagging.
IEE 802.3af (PoE)
An IEEE standard for providing Power over Ethernet (PoE) capabilities. When Ethernet is
passed over copper cable, two twisted pairs are used for data transfer, and two twisted
pairs are unused. With PoE, power can either be passed over the two data pairs or over
the two spare pairs.
IEEE 802.3x
Defines Ethernet frame start/stop requests and timers used for flow control on full-duplex
links. (Now incorporated in IEEE 802.3-2002)
IGMP Query
On each subnetwork, one IGMP-capable device will act as the querier — that is, the
device that asks all hosts to report on the IP multicast groups they wish to join or to which
they already belong. The elected querier will be the device with the lowest IP address in
the subnetwork.
IGMP Snooping
Listening to IGMP Query and IGMP Report packets transferred between IP Multicast
Routers and IP Multicast host groups to identify IP Multicast group members.
Internet Group Management Protocol (IGMP)
A protocol through which hosts can register with their local router for multicast services. If
there is more than one multicast switch/router on a given subnetwork, one of the devices
is made the “querier” and assumes responsibility for keeping track of group membership.
In-Band Management
Management of the network from a station attached directly to the network.
IP Multicast Filtering
A process whereby this switch can pass multicast traffic along to participating hosts.
Layer 2
Data Link layer in the ISO 7-Layer Data Communications Protocol. This is related directly
to the hardware interface for network devices and passes on traffic based on MAC
addresses.