HP Transcend Traffix Manager - Manual (Page 173)

G LOSSARY 173
OSI Open Systems Interconnection, a body of standards set by the
International Standards Organization to define the activities that must
occur when computers communicate. The OSI Reference Model is a
7-layer framework within which communications protocols and
standards have been defined.
packet A unit of information that contains data, origin information and
destination information, which is switched as a whole through a
network.
physical layer The first layer of the OSI Reference Model. This layer manages the
transfer of individual bits of data over wires, or whichever medium is
used to connect workstations and peripherals.
presentation layer The sixth layer of the OSI Reference Model. This layer controls the
formatting and translation of data.
probe Standalone RMON-1 or RMON-2 agent responsible for gathering
network data on a remote segment and passing it up to a central
management station. Usually configured and controlled by the client.
protocol As used in Traffix Manager, this is the RMON-2 decoding of the type of
traffic seen on the network.
protocol number The port or program number as defined by the parent protocol. For
example, if you are adding a TCP child protocol, the protocol number
will be the TCP port number.
RMON-1 Remote MONitoring. Subset of SNMP MIB II which allows monitoring
and management capabilities by addressing up to ten different groups
of information. Defined in IETF document RFC 1757.
RMON-2 Extends the capability of RMON-1 to include protocols above the MAC
layer.
segment For the purposes of the Traffix Manager reporter, a segment is
considered to be the interface on a particular agent on your network.
SNMP Simple Network Management Protocol. A protocol originally designed
to be used in managing TCP/IP internets.
subnet mask A filtering system for IP addresses. It distinguishes the network ID part
of an IP address from the host ID part. A subnet mask is a 32-bit
number expressed as four decimal numbers, in the range 0 to 255,