Samsung iES4028F Management Manual page 697

Glossary
IEEE 802.1s
An IEEE standard for the Multiple Spanning Tree Protocol (MSTP) which provides
independent spanning trees for VLAN groups.
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.
Glossary-3