> For the complete documentation index, see [llms.txt](https://mudassirs46.gitbook.io/network-fundamentals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mudassirs46.gitbook.io/network-fundamentals/full-duplex.md). # Full Duplex The device must not wait before sending a Frame. It can Send at Receive at the same time. (E.g. Landline Telephone) * **When Full Duplex is enabled it disables CSMA/CD because both can send & receive at the same time in Full Duplex settings so collisions cannot occur.** * Ethernet Switch is a dedicated Bandwidth device that supports Full duplex hence it does not share the bandwidth between the devices & provide full 10Mbps connection to each device connected to it. * On Full Duplex side you will see CRC / RUNT Errors. * [Autonegotiation](https://app.gitbook.com/@mudassirs46/s/network-fundamentals/~/drafts/-MRZ8l67L5MHnaQIEh9W/autonegotiation) failure leads to [Duplex Mismatch](https://app.gitbook.com/@mudassirs46/s/network-fundamentals/~/drafts/-MRZ8l67L5MHnaQIEh9W/duplex-mismatch) ## Reference: * CCNA 200-301 OCG, Volume 1, Pg. 160 - Wendell Odom. *