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I want search engines to connect the domain and subdomain together. eg: example.com and subdomain.example.com. Is my method of doing so a problem for SEO?

enter image description here

I want the main domain to link to the subdomain with dofollow links and anchor text but the subdomain to link back with web banner links and alt text.

Opposed to other methods of linking:

enter image description here

Is the first image correct in Google (SEO)?

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    I would say that using dofollow text links in both directions is most natural. (Your illustration with the red X.) Is there a reason that you don't want to do that? – Stephen Ostermiller Aug 28 '18 at 11:30
  • @StephenOstermiller I thought there was a problem with SEO – tooraj Aug 28 '18 at 11:57
  • answer this" Is it good for SEO to link back from a subdomain to the main domain using web banner links with alt text? " ? – tooraj Aug 28 '18 at 12:20
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    I don't know the answer to that. I use bidirectional dofollow text links between my main domain and my subdomains. I don't know of any SEO problems with doing it my way. – Stephen Ostermiller Aug 28 '18 at 12:34
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It is absolutely OK to dofollow link among domain and subdomain.

It could be a problem with dofollow linking, if you link two TLD domains among each other - in this case Google could suspect a PBN building, which is against its guidelines about manipulation of link juice flow. In case of TLD domains it is recommended to link with nofollow.

  • Does link via web banner also dofollow? A text link ( dofollow ) in one direction and web banner in other direction? Like the first image. thank you – tooraj Aug 29 '18 at 6:03
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    @tooraj Any href link <a href="">anchor</a> with any anchor content (image, text) you create is automatically dofollow, until you explicitely add to it rel="nofollow". – Evgeniy Aug 29 '18 at 8:42

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