That is, it inspects protocols and sessions and keeps a state of the connection in memory. ![]() With a CBAC configuration, the router acts like a firewall. However, a normal ACL is just a static packet filtering mechanism and nothing else. Many people use normal Access Control Lists on Cisco routers for traffic filtering and protection. ![]() ![]() For a low budget firewall functionality, a Cisco router with the proper IOS version can work as a network firewall providing stateful protocol inspection using the Context-Based Access Control (CBAC) feature.
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