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ATM: Asynchronous Transfer Mode. A connection oriented transmission protocol
based on fixed length cells (packets). ATM is designed to carry a complete range of
user traffic, including voice, data, and video signals.
auto-negotiation: A feature on a port that allows it to advertise its capabilities for
speed, duplex, and flow control. When connected to an end station that also supports
auto-negotiation, the link can self-detect its optimum operating setup.
backbone port: A port that does not learn device addresses, and receives all frames
with an unknown address. Backbone ports are normally used to connect the Switch to
the backbone of your network. Note that backbone ports were formerly known as
designated downlink ports.
backbone: The part of a network used as the primary path for transporting traffic
between network segments.
bandwidth: Information capacity, measured in bits per second, that a channel can
transmit. The bandwidth of Ethernet is 10Mbps, the bandwidth of Fast Ethernet is
100Mbps.
baud rate : The switching speed of a line. Also known as line speed between network
segments.
BOOTP: The BOOTP protocol allows you to automatically map an IP address to a
given MAC address each time a device is started. In addition, the protocol can assign
the subnet mask and default gateway to a device.
bridge: A device that interconnects local or remote networks no matter what higher
level protocols are involved. Bridges form a single logical network, centralizing
network administration.
broadcast: A message sent to all destination devices on the network.
broadcast storm: Multiple simultaneous broadcasts that typically absorb available
network bandwidth and can cause network failure.
console port: The port on the Switch accepting a terminal or modem connector. It
changes the parallel arrangement of data within computers to the serial form used on
data transmission links. This port is most often used for dedicated local management.
CSMA/CD: Channel access method used by Ethernet and IEEE 802.3 standards, in
which devices transmit only after finding the data channel clear for some period of
time. When two devices transmit simultaneously, a collision occurs and the colliding
devices delay their retransmissions for a random amount of time.
data center switching: The point of aggregation within a corporate network where a
switch provides high-performance access to server farms, a high-speed backbone
connection, and a control point for network management and security.
Ethernet: A LAN specification developed jointly by Xerox, Intel, and Digital
Equipment Corporation. Ethernet networks operate at 10Mbps using CSMA/CD to
run over cabling.
Fast Ethernet: 100Mbps technology based on the Ethernet/CD network access
method.
Flow Control: (IEEE 802.3z) A means of holding packets back at the transmit port of
the connected end station. Prevents packet loss at a congested switch port.
forwarding: The process of sending a packet toward its destination by an
internetworking device.
Full-duplex: A system that allows packets to be transmitted and received at the same
time and, in effect, doubles the potential throughput of a link.
Half-duplex: A system that allows packets to be transmitted and received, but not at
the same time. Contrast with full-duplex .