Within the following MongoDB Documentation Page (https://docs.atlas.mongodb.com/reference/api/vpc-create-container/) there is a link titled "private network" that resolves to the following URL (https://datatracker.ietf.org/doc/html/1918#section-3).
However, that link leads to a 404 Not Found Error:
"The page you were looking for couldn't be found.
The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again.
If you think this is a server error, please contact firstname.lastname@example.org."