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ccna book price.All ASA models can be configured and managed using the command line interface or Adaptive Security Device Manager (ASDM). ASDM is based on the browser256 Chapter 9 Implementing Cisco Adaptive Security Appliance ( ASA )browser Java applet that is used to configure and monitor software on the ASA. ASDM is loaded from the ASA onto the PC. ASDM is used to configure, monitorcontrol, and manage the device. The focus of this chapter is on the entry-level ASA5505, which is designed for small businesses, branch offices, and corporate telecommuting. Note: The four advanced features listed above are beyond the scope of this course and will not be explored in greater depth later.9.1.1.2 Review of Firewalls in Network DesignWhen we discuss networks connected to a firewall, there are some common terms to consider.External (outside) network: a network that lies outside the protection of the firewall.Inside (inside) network: a network that is protected that is located behind a firewall. DMZ: A non-military zone that is protected by a firewall while allowing restricted access to external users. The firewall protects the internal network from unauthorized access by users of the external network. It also protects internal network users from accessing each other. For example, by creating zones, administrators can isolate the network hosting the audit server from the rest of the organization's network. Cisco ISR can provide firewall functionality by using a zone-based policy firewall (ZPF) or by using the older content-based access control (CBAC) feature. An ASA can provide the same functionality, but its configuration is very different from configuring ZPF on an IOS router. An ASA is a specialized firewall hardware product. By default, it treats defined internal interfaces as trusted networks, and any defined external interfaces, as untrusted networks. Each interface has a corresponding level of security. These security trust levels ensure that the ASA enforces security policies. For example, internal users can access the external network based on certain defined addresses, with the necessary authentication or authorization, or by coordinating with an external URL filtering server.Network resources that external users need to access, such as Web or FTP servers, can be placed in the DMZ. the firewall allows restricted access to the DMZ while protecting external users from accessing the internal network.