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Simple Network Management Protocol (SNMP) Glossary
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
486
Simple Network Management Protocol (SNMP)
An International Standards Organization (ISO) protocol that sets standards for
communications between network components and network management
stations. SNMP handles network resources using the information contained in a
management information base (MIB), a virtual database resident on the various
parts of the network. SNMP supports security, configuration, performance, fault
management, and accounting management. SNMP is part of the ISO Open
System Interconnect (OSI) Model specification.
SMDR
Station Message Detail Recording. (Same as call detail recording — CDR).
SNMP
See Simple Network Management Protocol (SNMP).
SPE
Switch Processing Element
subnet
A network within a larger network. Subdividing a network into subnets
improves the efficiency of routing and makes the best use of the limited number
of addresses available with any given addressing scheme. Subnetworks are
defined by using part of the host-machine portion of the IP (Internet Protocol)
address as an additional layer of network information. Routers can then
distinguish between a networking part that is significant for internet/intranet
routing and a host-machine part, which is significant only within the local
subnet.
subnet mask
A bit pattern that lets a network administrator define subnets using the
host-machine portion of the IP (Internet Protocol) address. The subnet mask has
binary ones in positions corresponding to the network and subnet parts of the
address and zeros in the remaining, host-address positions. During IP-address
resolution, zero fields in the mask hide corresponding host-address fields in the
address, causing the router to ignore them. The router resolves only the
networking part of the address, leaving the host part for the local subnet to
resolve. This increases speed and makes multicasting more efficient. Subnet
masks are usually written in the decimal notation used for IP addresses.
T T-1
A 4-wire (2 twisted pair), digital communications link with a capacity of 1.544
Mbps (1,544,000 bits per second). A T-1 provides 24 separate 64-Kbps
channels. These can support up to 23 concurrent voice and data channels plus a
separate channel for signalling and framing (synchronization). T-1 is the
standard for data communications in North America and Japan. Also spelled
T1. See E-1.