Cabletron Systems SSR-ATM29-02, User Manual, Page: 367 / 386

CoreWatch User’s Guide 367
Glossary
Internet Control Message Protocol (ICMP)
Protocol that reports IP packet errors and provides other information about the processing
of IP packets.
Internet Group Management Protocol (IGMP)
Protocol IP hosts use to report their host group memberships to any multicast routers to
which the IP hosts are connected.
Internet Group Management Protocol (IGMP) Host-Query Packet
Packet an IGMP router sends to hosts to learn which hosts are available. Host queries help
a router determine changes to host membership.
Internetwork Packet Exchange (IPX)
A datagram connectionless protocol.
Internet Protocol (IP)
Layer-3 (network) protocol that allows connectionless internetworking. IP uses best-effort
delivery to route packets through any number of paths. It fragments and reassembles
packets, but does not guarantee delivery of those packets. TCP is responsible for
guaranteeing delivery.
Internet Service Provider (ISP)
Company that provides access to the Internet.
Leaf
Interface for which no downstream dependent neighbors exist.
Link-State Advertisement (LSA)
Packet that describes the local state of a router or network. This includes the state of the
router's interfaces and adjacencies. Each link-state advertisement is flooded throughout
the routing domain. The collected link-state advertisements of all routers and networks
form the protocol's topological database.
Local Area Network (LAN)
Network that connects workstations, terminals, printers, and other devices located in a
small geographical area (such as a single building).
Login Password
Password you are prompted for when you start CoreWatch.
Loopback
Interface state that indicates the router's interface to the network is looped back. Although
this makes the router unavailable for regular traffic, you can still send ICMP pings to the
router or perform error-bit tests.