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The website that i am looking after has a sub-domain and the sub-domain is not linked from the main domain and the sub domain has backlinks from many spam links and untrusted forums. Will the backlinks of the sub-domain affect the main domain from seo point of view? and also will it affect the rankings and PR of the main domain? I have heard that Search engines will treat sub-domains as separate webite.
[edited by: coopster at 3:23 pm (utc) on April 25, 2009]
[edit reason] no signatures please TOS [webmasterworld.com] [/edit]
Will Subdomain Backlink affect Main Domain?
A subdomain, however, is often a domain name system (DNS) alias. Subdomains can be a little more difficult for a novice webmaster to set up, especially if words like “CNAME” don’t mean anything to you. Subdomains can be managed separately, which can be a joy
those links should only affect the main site if the subdomain links to it.
I'm curious about this subject as well because our blog is a subdomain (blog.yoursite.com) where we often write about our featured products (and other news bits) that we do link back to the particular product on the main site using our keywords. Is this also considered internal linking (between subdomain and main site), and can subdomains be used to reciprocate a link if the participating site links to our main site instead?
If you're actively encouraging behavior that is against most search engine guidelines and policies a human may very well decide that you are a problem and adjust rankings accordingly, manually.