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To ensure that VoIP traffic in a contact center is not impacted by performance issues after deploying an access control policy on a Cisco Secure Firewall Threat Defense (FTD) device, the engineer should configure the access control rule with the "trust" action. The "trust" action allows traffic to bypass inspection and policy enforcement, ensuring that critical VoIP traffic is not delayed or degraded.

Steps:

In FMC, navigate toPolicies > Access Control > Access Control Policy.

Create a new rule or edit an existing rule.

Set the source and destination for the VoIP traffic.

Set the action to "trust" to ensure the VoIP traffic is not inspected.

By configuring the rule with the "trust" action, the VoIP traffic will be prioritized, maintaining the quality and performance required for the contact center operations.

To exempt a custom application from being flagged by Cisco Secure Endpoint, the organization must precalculate the hash value of the custom application and add it to the allowed applications list. This process involves creating a hash of the executable file, which uniquely identifies it, and then configuring Cisco Secure Endpoint to recognize this hash as trusted.

Steps:

Calculate the hash value (e.g., SHA-256) of the custom application executable.

In the Cisco Secure Endpoint management console, navigate to the policy configuration.

Add the calculated hash value to the list of allowed applications or exclusions.

Save and deploy the updated policy.

By adding the hash value to the allowed applications, Cisco Secure Endpoint will recognize the custom application as trusted and will no longer flag it.

When performing packet capture on a Cisco Secure Firewall Threat Defense (FTD) device, ensuring that the allocated memory is sufficient is crucial for capturing all necessary traffic during a specified capture session. If users experience issues accessing a server and the engineer suspects not all traffic was collected, it indicates that the current memory allocation might not be enough to store the entire capture data for the 15-minute session.

Steps:

Check the current memory allocation for packet captures on the FTD device.

Increase the memory allocation if it is insufficient to handle the volume of traffic expected during the capture session.

This ensures that all relevant traffic is captured and can be analyzed to diagnose and resolve the network issue.

The default action setting in a Cisco FTD Access Control Policy determines how the system handles and logs traffic that is not handled by any other access control configuration. The default action can block or trust all traffic without further inspection, or inspect traffic for intrusions and discovery data3.

The Trust All Traffic option allows all traffic from an undefined application to pass without Snort inspection. This option also disables Security Intelligence filtering, file and malware inspection, and URL filtering for all traffic handled by the default action. This option is useful when you want to minimize the performance impact of access control on your network3.

The other options are incorrect because:

The Inherit from Base Policy option inherits the default action setting from the base policy. The base policy is the predefined access control policy that you use as a starting point for creating your own policies. Depending on which base policy you choose, the inherited default action setting can be different3.

The Network Discovery Only option inspects all traffic for discovery data only. This option enables Security Intelligence filtering for all traffic handled by the default action, but disables file and malware inspection, URL filtering, and intrusion inspection. This option is useful when you want to collect information about your network before you configure access control rules3.

The Intrusion Prevention option inspects all traffic for intrusions and discovery data. This option enables Security Intelligence filtering, file and malware inspection, URL filtering, and intrusion inspection for all traffic handled by the default action. This option provides the most comprehensive protection for your network, but also has the most performance impact3.