3Com 3CBLSG48 User Manual page 223

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PPEnDIX : lOSSARY
IEEE 802.1X
IEEE 802.3ac
IEEE 802.3x
IGMP Snooping
IGMP Query
Internet Control
Message Protocol
(ICMP)
Internet Group
Management
Protocol (IgMP)
In-Band Management
IP Multicast Filtering
IP Precedence
Layer 2
Port Authentication controls access to the switch ports by requiring
users to first enter a user ID and password for authentication.
Defines frame extensions for VlAn tagging.
Defines Ethernet frame start/stop requests and timers used for flow
control on full-duplex links.
listening to IgMP Query and IgMP Report packets transferred
between IP Multicast Routers and IP Multicast host groups to identify IP
Multicast group members.
On each subnetwork, one IgMP-capable device can 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 is the device with the lowest IP address in the subnetwork.
A network layer protocol that reports errors in processing IP packets.
ICMP is also used by routers to feed back information about better
routing choices.
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.
Management of the network from a station attached directly to the
network.
A process whereby this switch can pass multicast traffic along to
participating hosts.
The Type of Service (ToS) octet in the IPv4 header includes three
precedence bits defining eight different priority levels ranging from
highest priority for network control packets to lowest priority for
routine traffic. The eight values are mapped one-to-one to the Class of
Service categories by default, but may be configured differently to suit
the requirements for specific network applications.
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.