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For questions about duplex on an interface spanning all on topic network devices. For instance, you are troubleshooting an issue where two devices will not negotiate the correct duplex.

19
votes
When autonegotiation fails on one node, to choose (half/full-duplex) we must use the rule: If you have a 10/100 Mb/s interface -> use half-duplex If you have a 1000 Mb/s interface-> use … full-duplex Why is that? Summary In brief, ethernet has been around since the 1980s... as a result Old ethernet NICs only supported half duplex operation with no auto-negotiation. If you …
answered Aug 18 '13 by Mike Pennington
14
votes
Theory By convention, a collision domain is a contiguous wired and / or wireless half-duplex segment (typically using CSMA/CD), which is a subset of the subnet or vlan's broadcast domain … . Collision domains are invariably a half-duplex segment, or a series of connected half-duplex segments. Ethernet hubs / Wifi Access Points (within the same RF-channel width) start or continue a collision …
answered Apr 2 '14 by Mike Pennington