Small businesses have a variety of tools at their disposal to protect their networks from intrusion, but experts say fending off cybercriminals entails more than building a strong wall to keep them out: It also requires someone to oversee it. All the antivirus and antimalware software in the world is no good if hackers are let in the door. Commentator Nathan Segal offers tips for avoiding Internet scams that lure unsuspecting users to download malicious software, reveal passwords and give up private information. His advice includes using hosting security tools and password-protection services.

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