A link exchange is you each link to each others sites, I guess the only way you could have a one way link exchange would be to each have 2 sites, so you are not doing a reciprocal link (although strictly speaking you are still exchanging links) Do you just mean one way backlinks?
One way linkexchange is way that your links belongs to other niche website, is called one way link exchange, in this process we can't doing reciprocal process here...
I wanna knw either Directory,Article submissions is a source of one way link exchange or it is different ?
Search engines favor one way links as these are more natural than reciprocal links. Generally a one way link has more weight, or more value to your website than a reciprocal link. One way link exchange includes directory submission,article submission,blog commenting and smo activities.
I don't think you can refer to it as a 'link exchange', because if you exchange links with someone, it automatically becomes 'reciprocal link exchange' One-Way links are built naturally. For example, if someone really likes your blog post and decides to link your post to a post on his/her blog, it's a one-way link. Some people also request others for one-way links (even pay for them), but personally I don't think that's the right approach. You should let your content do the talking.
I agree with jacob_seo its not one way link exchange. exchange is "two way links" or reciprocal links. one way link is simple. for example: i like the article on your site and i give a link to yours from my blog. that's called one way links.
Natural one way links are way better. Those that you would get by posting to other people's blogs for instance. There are also services that can provide this type of link. But be careful.
There is no one way link exchange term. Link exchange mean exchange of links (give and take link) or reciprocal links building may be two or three way. Sometime webmaster provide you one way and did not required back links in exchange.
You are getting links for your sites but you are not linking to them is 1 way backlink, free directory submission is slow but easiest way for 1 way backlinks.
Most of good one-way links come from paid advertising. So i think reciprocal link is better than one way link because it's free.
There are tons of ways to get free one way links. I've posted them over and over again in this forum. For those of you that have missed it: 1. blog carnivals 2. blog reviews 3. guest blogging 4. do follow blog commenting 5. viral blog memes 6. blog contests 7. social media sites 8. social bookmarking sites 9. rss feed directories 10. web 2.0 sites These are just a few. Hope it helps!