Glossary
Internet Control Message Protocol (ICMP)
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.
Internet Group Management Protocol (IGMP)
A protocol through which hosts can register with their local router fo r multicast
services. If there is more than one multicast switch/router on a given subnet work,
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 netw ork.
IP Multicast Filtering
A process whereby this switch can pass multicast traffic along t o participati ng hosts.
IP Precedence
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 mapp ed one-to -one
to the Class of Service categories by default, but may be configur ed different ly to
suit the requirements for specific network applications.
Layer 2
Data Link layer in the ISO 7-Layer Data Communications Protocol. This is related
directly to the hardware interface for network de vices a nd passe s o n t raffic based on
MAC addresses.
Layer 3
Network layer in the ISO 7-Layer Data Communications Protocol. This layer handles
the routing functions for data moving from one open system to anoth er.
Link Aggregation
See Port Trunk.
Link Aggregation Control Protocol (LACP)
Allows ports to automatically negotiate a trunked link with LACP-configured ports on
another device.
Management Information Base (MIB)
An acronym for Management Information Base. It is a set of database objects that
contains information about a specific device.
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