Girl Geekette

 
Store and Forward
With this method, the LAN switch copies the entire frame into buffers. The CRC (Cylic Redundancy Check) is checked. If there is an error, if it is a runt frame (< 64 bytes) or if its a giant frame ( > 1518 bytes), then it is discarded. If there are no errors, the switch looks up the destination address and forwards the frame. Because it copies all of it, latency can vary and can be longer than other methods.

Cut Through
The LAN switch only copies the destination address (The first 6 bytes following the preamble) into its buffers. It looks up the destination address in its tables and forwards the frame. Latency is less, because the whole frame is not copied first.

Fragment Free (Modified Cut Through)
In this version of the cut-through, the switch waits for the collision window (64 bytes) to pass before forwarding. If a packet has an error, usually it is in the first 64 bytes. This provides better error checking than cut-through mode and has almost no increase in latency. 
802.1d STP - detects and eliminates loops in routed networks; Sends out BPDU’s - Bridge Protocol Data Units

VLAN: Virtual LANs - Create logical networks by location, function or department. Done with a switch using Frame Tagging (Switches if you sue
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