Current trends in security threat vectors require a carefully planned threat control strategy. Trends that affect security include persistent application-layer threats that use social engineering to exploit the trust architecture of the enterprise, the pervasiveness of mobility and consumerization, and the insidious motivations behind the behavior of the attacker. All these trends result in the need for dynamic security intelligence gathering and distribution, early warning systems, and application layer inspection for mobile services where data and applications are hosted in the cloud. This course suggests design principles to plan a threat control and containment strategy using firewalls and intrusion prevention systems (IPSs) in Cisco IOS environments. Cisco provides basic traffic filtering capabilities with access control lists (ACLs). You can configure ACLs for all routed network protocols to filter packets as the packets pass through a router or security appliance. There are many reasons to configure ACLs. For example, you can use ACLs to restrict the contents of routing updates or to provide traffic flow control. One of the most important reasons to configure ACLs is to provide security for your network. This course outlines the types of ACLs that are available and offers guidelines on creating ACLs to provide network security in IP version 4 (IPv4) and IP version 6 (IPv6) environments. A firewall protects network devices from intentional hostile intrusion that could threaten information assurance (that is, availability, confidentiality, and integrity) or lead to a denial of service (DoS) attack. A firewall can protect a hardware device or a software program running on a secure host computer. This course ends with an introduction to the firewall technologies that Cisco uses in routers and security appliances. 

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