ExplanationDynamic ARP inspection (DAI) is a security feature that validates ARP packets in a network. It intercepts, logs, and discards ARP packets with invalid IP-to-MAC address bindings. This capability protects the network from certain man-in-the-middle attacks. After enabling DAI, all ports become untrusted ports.

Explanation
Micro-segmentation secures applications by expressly allowing particular application traffic and, by default, denying all other traffic. Micro-segmentation is the foundation for implementing a zero-trust security model for application workloads in the data center and cloud.
Cisco Tetration is an application workload security platform designed to secure your compute instances across any infrastructure and any cloud. To achieve this, it uses behavior and attribute-driven microsegmentation policy generation and enforcement. It enables trusted access through automated, exhaustive context from various systems to automatically adapt security policies.
To generate accurate microsegmentation policy, Cisco Tetration performs application dependency mapping to discover the relationships between different application tiers and infrastructure services. In addition, the platform supports "what-if" policy analysis using real-time data or historical data to assist in the validation and risk assessment of policy application pre-enforcement to ensure ongoing application availability. The normalized microsegmentation policy can be enforced through the application workload itself for a consistent approach to workload microsegmentation across any environment, including virtualized, bare-metal, and container workloads running in any public cloud or any data center. Once the microsegmentation policy is enforced, Cisco Tetration continues to monitor for compliance deviations, ensuring the segmentation policy is up to date as the application behavior change.
Reference:
/solution-overview-c22-739268.pdf

Using a company-managed Amazon S3 bucket for Cisco Umbrella logs allows the administrator to have full control over the access and lifecycle of the log data. This configuration can grant third-party SIEM integrations write access to the S3 bucket, which can enable more advanced analysis and correlation of the log data with other sources. This configuration also provides more flexibility in terms of how long the data can be stored offline, as opposed to the Cisco-managed S3 bucket, which has a fixed retention period of 30 days. References:
* Enable Logging to Your Own S3 Bucket
* Centralized Umbrella Log Management with Amazon's S3 service for MSP, MSSP, and Multi-org customers