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<p>middlebox functionality. One 2017 study counted more than 1,000 deployments in <a href="page.php?w=Autonomous_system_%28Internet%29">autonomous systems</a>, in both directions of traffic flows, and across a wide range networks, including mobile operators and data center networks.</p>

<p><big> Examples </big></p>
<p>The following are examples of commonly-deployed middleboxes:</p>

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* <a href="page.php?w=Firewall_%28computing%29">Firewalls</a> filter traffic based on a set of predefined security rules defined by a network administrator. IP firewalls</p><p>
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