In a profile page of any Stack Exchange site if we filter any tab, it adds
&sort=XYZ. E.g. the activity tab on my meta profile page. In the activity tab if you click on particular filter option e.g. posts, then it will add
&sort=posts as a parameter in the URL. So I can redirect anyone in my profile -> activity -> posts.
But in a network profile
?tab=xyz parameter is available but
&sort=xyz is not available. E.g. my activity tab on my network profile. Here clicking on posts filter will filter by posts but it won't add
&sort=posts parameter. Also a link with that parameter won't redirect us to the filtered page. E.g. I can not link like this: my network profile -> activity -> posts.
This is already noted by @animuson. So it is request to add filter page link on network profile page too.