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broadcast domain
A set of all devices that receive broadcast frames originating from andy device within the set. Devices in teh same VLAN are in the same broadcast domain.
broadcast frame
An Ethernet frame sent to destination address FFFF.FFFF.FFFF, meaning that the frame should be delivered to all hosts on that LAN.
collision domain
A set of network interface cards (NICs) for which a frame sent by one NIC could result in a collision with a frame sent by any other NIC in the same collision domain.
cut-through switching
One of three options for internal processing on some models of Cisco LAN switches in which the frame is forwarded as soon as possible, including forwarding the first bits of the frame before the whole frame is received.
The result of the LAN switch forwarding process for broadcasts and unknown unicast frames. Switches forward these frames out all interfaces, except the interface in which the frame arrived. Switches also forward multicasts by default, although this behavior can be changed.
fragment-free switching
One of three internal processing options on some Cisco LAN switches in which the first bits of the frame may be forwarded before teh entire frame is received, but not until the first 64 bytes of the frame are received, in which case, in a well-designed LAN, collision fragments should not occur as a result of this forwarding logic.
The process in LAN design by which every switch port connects to a single device, with no hubs connected to the switch ports, creating a separate colllision domain per interface. The term's origin relates to the fact that one definition for the word "segment" is "collision domain," with a switch separating each switch port into a separate collision domain or segment.
The process of breaking a large piece of data from an application into pieces appropriate in size to be sent through the network.
Spanning Tree Protocol (STP)
A bridge protocol that uses the Spanning Tree algorithm, allowing a switch to dynamically work around loops in a network topology by creating a spanning tree. Switches exchange bridge protocol data unit (BPDU) messages with other bridges to detect loops and then remove the loops by shutting down selected bridge interfaces.
store-and-forward switching
One of three internal processing options on some Cisco LAN switches in which the Ethernet frame must be completly received before teh switch can begin forwarding the first bit of the frame.
unknown unicast frame
An Ethernet frame whose destination MAC address is not listed in a switch's MAC address table, so the switch must flood the frame.
virtual LAN (VLAN)
A group of devices, connected to one or more switches, with the devices grouped into a single broadcast domain through switch configuration. VLANs allow switch administrators to separate the devices connected to the switches into separate VLANs without requiring separate physical swithces,gaining design advantages of separating the traffic without the expense of buying additional hardware.
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