duplex mode for a switchport can take one of two states, half or full. half duplex describes essentially that a port can send or receive one way at a time. full duplex allows a switchport to send and receive simultaneously.
autonegotiation is a mode that will allow each end of a transmission to detect the others duplex setting and adjust to it, to agree to it, to allow the best negotiation that can be achieved for that segment. for example, if one side is physically limited to half duplex, and the other capable of full duplex operation, the autonegoriation will adjust the full side to agree with the half duplex side for best performance under that limitation.
A duplex mismatch will occur between ports set for conflicting duplex modes. this does not mean that communication is lost, there will still be lights on both sides of the connection, but this will manifest in errors across the line, particularly, cdp errors... suboptimal...
sw2950_02#
03:15:48: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/1
(not half duplex), with sw2950_01 FastEthernet0/3 (half duplex).
03:15:48: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/1
ieee 802.3 is the standard that defined 10Mbps 802.3 ethernet, and its later incarnations fast, gig and 10gig
network cisco ccna gns3 certification arteq
a network runs through it
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