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Routers interconnect networks of various enterprises, and the more secure the entry or exit points are made, the more robust the security of these enterprises is. These routers become the first direct targets and are vulnerable to security attacks. If these routers are not tightly protected, the attackers get an edge to intrude the system. In order to ensure the security of these routers, Secure Access Control Lists (ACLs) Filtering-Based Enterprise Networks (SAFE-Nets) are proposed in this chapter. In this scheme, routers are configured with Access Control Lists (ACL) that are used to filter in the intended packets and filter out the dangerous malicious packets from network traffic. This consolidates security deployment over the entire network on top of anti-virus software, weak passwords, latent software vulnerabilities, and other related secure measures. This can help network technicians working for various enterprises …