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LGB5028A User‘s Manual
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Appendix A: Glossary
IGMP: IGMP is an acronym for Internet Group Management Protocol. It is a communications protocol used to manage the
membership of Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent multicast routers to establish multicast
group memberships. It is an integral part of the IP multicast specification, like ICMP for unicast connections. IGMP can be used for
on-line video and gaming, and allows more efficient use of resources when supporting these uses.
IGMP Querier: A router sends IGMP Query messages onto a particular link. This router is called the Querier.
IMAP: IMAP is an acronym for Internet Message Access Protocol. It is a protocol for e-mail clients to retrieve e-mail messages
from a mail server.
IMAP is the protocol that IMAP clients use to communicate with the servers, and SMTP is the protocol used to transport mail to
an IMAP server.
The current version of the Internet Message Access Protocol is IMAP4. It is similar to Post Office Protocol version 3 (POP3), but
offers additional and more complex features. For example, the IMAP4 protocol leaves your e-mail messages on the server rather
than downloading them to your computer. If you wish to remove your messages from the server, you must use your mail client to
generate local folders, copy messages to your local hard drive, and then delete and expunge the messages from the server.
IP: IP is an acronym for Internet Protocol. It is a protocol used for communicating data across an internet network.
IP is a “best effort” system, which means that no packet of information sent over is ensured to reach its destination in the same
condition it was sent. Each device connected to a Local Area Network (LAN) or Wide Area Network (WAN) is given an Internet
Protocol address, and this IP address is used to identify the device uniquely among all other devices connected to the extended
network.
The current version of the Internet protocol is IPv4, which has 32-bit Internet Protocol addresses allowing for in excess of four bil-
lion unique addresses. This number is reduced drastically by the practice of webmasters taking addresses in large blocks, the bulk
of which remain unused. There is a rather substantial movement to adopt a new version of the Internet Protocol, IPv6, which
would have 128-bit Internet Protocol addresses. This number can be represented roughly by a three with thirty-nine zeroes after
it. However, IPv4 is still the protocol of choice for most of the Internet.
IPMC: IPMC is an acronym for IP MultiCast.
IP Source Guard: IP Source Guard is a secure feature used to restrict IP traffic on DHCP snooping untrusted ports by filtering
traffic based on the DHCP Snooping Table or manually configured IP Source Bindings. It helps prevent IP spoofing attacks when a
host tries to spoof and use the IP address of another host.
LACP: LACP is an IEEE 802.3ad standard protocol. The Link Aggregation Control Protocol enables bundling several physical ports
together to form a single logical port.
LLC: The IEEE 802.2 Logical Link Control (LLC) protocol provides a link mechanism for upper layer protocols. It is the upper sub-
layer of the Data Link Layer and provides multiplexing mechanisms that make it possible for several network protocols (IP, IPX) to
coexist within a multipoint network. LLC header consists of 1-byte DSAP (Destination Service Access Point), 1-byte SSAP (Source
Service Access Point), 1- or 2-byte Control field followed by LLC information.
LLDP: LLDP is an IEEE 802.1ab standard protocol.
The Link Layer Discovery Protocol (LLDP) specified in this standard allows stations attached to an IEEE 802 LAN to advertise, to
other stations attached to the same IEEE 802 LAN, the major capabilities provided by the system incorporating that station, the
management address or addresses of the entity or entities that provide management of those capabilities, and the identification
of the station’s point of attachment to the IEEE 802 LAN required by those management entity or entities. The information
distributed via this protocol is stored by its recipients in a standard Management Information Base (MIB), making it possible for
the information to be accessed by a Network Management System (NMS) using a management protocol such as the Simple
Network Management Protocol (SNMP).
LLDP-MED: LLDP-MED is an extension of IEEE 802.1ab and is defined by the telecommunication industry association (TIA-1057).
LOC: LOC is an acronym for Loss Of Connectivity and is detected by a MEP and is indicating lost connectivity in the network. Can
be used as a switch criteria by EPS.