I have built and engineered (including hands-on physical inspection and RF analytics) of 100s of thousands of Ethernet ports. Ethernet does not have a clock on the wire.
If you are running industrial Ethernet (e.g. Electrical grid switching, trading floors, IP Studio - SMPTE 2110, AES67, Dante etc.) you may need to run Precision Time Protocol IEEE 15888, but no-one is doing that domestically!
Clocking: again!
There are all manner of folk claiming that clocking is irrelevant to Ethernet and USB connections. While this is obviously ignorant of the RMI/EMI and ground level effects on DA conversion and the analogue stages of a DAC, the level to which digital clocking matters was again brought into stark relief when I changed the clock cable between the Antelope 10m clock and the Etherregen from the cable supplied by Antelope to a Shunyata Clock75 Sigma cable. Shazam! Everything jumping into focus and significantly more snap and reverb. In our hobby everything matters and we are only at the very beginning of optimizing streaming.