The truth is that if search engine optimization does not only focus on link game, then why would negative SEO be all about it? The question that now arises is how to protect a site from negative attacks. We say doing that will mean constantly monitoring the inbound links and looking out for spammy pages.
Keep an eye on the pages and check the code to see if it underwent any recent coding update. The best way to see if anything malicious is being put on the site is to look for any update in the code that doesn’t have any trace in the log file. Do proper examination upon noticing reduction in the site speed.