VLAN Trunk Ports: This feature is applicable only to Cisco ASA 5505 appliances because they have the built-in Ethernet switch.Keep in mind that you can create a larger number of subinterfaces on some ASA appliances, but this particular limit only kicks in when you actually assign the given number of subinterfaces to VLANs with the vlan interface command. This limit can be expanded on Cisco ASA 5505, ASA 5510, and ASA 5512-X models by applying a Security Plus license. Maximum VLANs: Each platform has its own limit on the maximum number of configurable VLANs.There are additional platform-specific limitations on the total number of interfaces that can be configured in the system the total limit covers physical and redundant interfaces, VLAN subinterfaces, EtherChannels, and bridge groups. Maximum Physical Interfaces: All Cisco ASA platforms always allow you to use all of the available physical interfaces, so this feature either shows the actual number of physical interfaces on the Cisco ASA 5505 or displays Unlimited on all other platforms.The system will deny only new attempted connections above the licensed limit there are no adverse effects for existing connections in this case. This limit can only be increased with the Security Plus license on Cisco ASA 5505, ASA 5510, and ASA 5512-X appliances. Firewall Connections: Cisco ASA Software limits the maximum concurrent count of all stateful connections depending on the hardware platform.The following licensed features fall under the category of basic platform capabilities: Tiered capacity features: Depend on the size of a projected user base and allow for future growth.Advanced security features: Can satisfy specific network design goals for a particular Cisco ASA installation.Basic platform capabilities: Typically are relevant to all Cisco ASA deployments.This feature is not supported for Microsoft Azure. In 9.6(2), we also added support for this feature for the ASAv on Amazon Web Services. For highly secure environments where communication with the Cisco Smart Software Manager is not allowed, you can request a permanent license for the ASAv. Permanent License Reservation for the ASAv.An attacker could exploit this vulnerability by triggering a DNS request from the Cisco ASA Software. The vulnerability is due to a flaw in handling crafted DNS response messages. A vulnerability in the DNS code of Cisco ASA Software could allow an unauthenticated, remote attacker to cause an affected device to reload or corrupt the information present in the device's local DNS cache.As you identify the correct feature set to take the most advantage of Cisco ASA capabilities while fully protecting your network, it helps to organize the licensed features into the following logical categories:

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