Question

What is autonegotiation in networking animation?

Answer 1

Autonegotiation is an Ethernet procedure by which two connected devices choose common transmission parameters, such as speed, duplex mode, and flow control. In this process, the connected devices first share their capabilities regarding these parameters and then choose the highest performance transmission mode they both support. In the OSI model, autonegotiation resides in the physical layer. For Ethernet over twisted pair it is defined in clause 28 of IEEE 802.3.[1]

Autonegotiation was originally defined as an optional component in the Fast Ethernetstandard.[2] It is backwards compatible with the normal link pulses (NLP) used by 10BASE-T.[3] The protocol was significantly extended in the gigabit Ethernet standard, and is mandatory for 1000BASE-T gigabit Ethernet over twisted pair.[4]