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A 12−digit number that is used to uniquely identify each device on an IPX network.
storage area network
A subnetwork of storage devices, usually found on high−speed networks and shared by all servers on
the network.
store−and−forward
A fast packet−switching method that produces a higher latency than other switching methods. The
switch waits for the entire packet to arrive before checking the CRC. It then forwards or discards the
packet.
StreetTalk
A global naming service created by Banyan and included with the Banyan Vines network operating
system.
subnet mask
A 32−bit address that is used to mask or screen a portion of the IP address to differentiate the part of
the address that designates the network and the part that designates the host.
subnetting
The process of dividing your assigned IP address range into smaller clusters of hosts.
Subnetwork Access Protocol (SNAP)
An Internet protocol that specifies a standard method of encapsulating IP datagrams and ARP
messages on a network.
supernetting
Aggregating IP network addresses and advertising them as a single classless network address.
switch
A Layer 2 networking device that forwards frames based on destination addresses.
switch block
Switching devices located in wiring closets, requiring high−speed uplinks and redundancy. The
switch block connects end−user stations to the switches that connect to the Distribution layer.
Switched Multimegabit Data Service (SMDS)
Defined by IEEE 802.6; the Physical−layer implementation for data transmission over public lines at
speeds between 1.544Mbps (T1) and 44.736Mbps using cell relay and fixed−length cells.
Switched Port Analyzer (SPAN)
A port at which traffic from another port or group of ports is attached to a protocol analyzer or probe
device. The SPAN aids in the diagnoses of problems related to traffic patterns on the network.
switched virtual circuit
A virtual circuit that is established dynamically on demand to form a dedicated link and is then
broken when transmission is complete. Also known as a switched virtual connection in ATM
terminology.
switching fabric
The "highway" the data takes to get from the input port on a switch to the output port.
synchronous transmission
Digital signal transmission method using a precise clocking method and a predefined number of bits
sent at a constant rate.
syslog
Messages sent to a remote machine regarding the switch system configuration, such as software and
configuration changes.
T
T1
Digital WAN carrier facility that transmits DS−1−formatted data at 1.544Mbps through the telephone
switching network, using AMI or B8ZS coding.
TCP/IP
See Transmission Control Protocol/Internet Protocol.
Telecommunications Industry Association (TIA)
393
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Troubleshooting
