Glossary - D-Link DGS-3212SR User Manual

Glossary

100BASE-FX: 100Mbps Ethernet implementation over fiber.
100BASE-TX: 100Mbps Ethernet implementation over Category 5 and Type 1 Twisted Pair
cabling.
10BASE-T: The IEEE 802.3 specification for Ethernet over Unshielded Twisted Pair (UTP)
cabling.
ageing: The automatic removal of dynamic entries from the Switch Database which have timed-
out and are no longer valid.
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 which 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 which does not learn device addresses, and which 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
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
an 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.
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