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A firewall is a built-in internet security device that blocks all unauthorized access to the network while allowing access to authorized users. A firewall works by first monitoring, then filtering all ingoing/outgoing network traffic and subsequently allowing or blocking outsider access according to pre-set rules.

What Small and Midsize Businesses Need to Know About Firewall

Businesses can invest in basic firewalls that use traffic-scanning devices or more sophisticated firewalls that provide more protective features, such as hiding network IP addresses. For both large and small businesses, security breaches can be catastrophic. However, a strong firewall—one that detects and blocks not only unauthorized users, but other unwanted visitors such as viruses and spam—can provide a crucial first line of defense in a company’s computer security system.

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