Search notes:

System.Net.AuthenticationSchemes (enum)

foreach ($e in [enum]::GetValues('System.Net.AuthenticationSchemes')) {
   write-host "$e $($e.value__)"
}

`None`	0
`Digest`	1
`Negotiate`	2
`Ntlm`	4	See also NTLM
`IntegratedWindowsAuthentication`	6
`Basic`	8
`Anonymous`	32771

See also