AMX NXA-ENET24 Instruction Manual page 411

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 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.
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 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.
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.
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 another.
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.
MD5
An algorithm that is used to create digital signatures. It is intended for use with 32 bit machines and
is safer than the MD4 algorithm, which has been broken. MD5 is a one-way hash function, meaning
that it takes a message and converts it into a fixed string of digits, also called a message digest.
Multicast Switching
A process whereby the switch filters incoming multicast frames for services for which no attached
host has registered, or forwards them to all ports contained within the designated multicast VLAN
group.
NXA-ENET Software Management Guide 395