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642-552 - SND - Securing Cisco Network Devices Exam
How does an application-layer firewall work?
examines the data in all network packets at the application layer and maintains complete connection state and sequencing information
operates at Layers 3, 4 and 5, and keeps track of the actual application communication process by using an application table
determines whether the connection between two applications is valid according to configurable rules
allows an application on your private network that does not have a valid registered IP address to communicate with other applications through the Internet
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