To protect from Negative SEO Attacks one should take care of following points:
1. Set up Google Webmaster Tools Email Alerts
2. Keep Track of Your Backlinks Profile
3. Protect Your Best Backlinks
4. Secure Your Website from Malware and Hackers
5. Check for Duplicate Content
6. Monitor Your Social Media Mentions
7. Watch Your Website Speed
8. Don’t be a Victim of Your Own SEO Strategies
9. Don’t Make Enemies Online