Question 180
A device sends frequent small HTTPS bursts to a suspicious host while TLS decryption is prohibited by company privacy policy. Which Cisco security control or operational response BEST addresses the stated need?
Explanation
Correct Answer
Correlate encrypted flow characteristics with endpoint, DNS, and identity context rather than assuming encrypted payloads are visible to ordinary sensors. This control addresses the failure mechanism and narrows the enforcement boundary. Encrypted traffic analytics can leverage metadata and behavior; encryption reduces payload visibility and does not make a flow automatically benign. Confirm pre-change conditions using: Inspect TLS handshake metadata permitted by policy, flow statistics, DNS logs, endpoint process telemetry, and detection confidence. Situation: A device sends frequent small HTTPS bursts to a suspicious host while TLS decryption is prohibited by company privacy policy.
Incorrect Answers
Compare running Cisco IOS XE or Secure Firewall settings to an applicable CIS benchmark, document justified exceptions, and remediate deviations. This response applies to CIS device configuration baseline assessment, not the controlling requirement in this case. Security benchmarks are version-specific prescriptive baselines; blindly applying all recommendations without operational review can disrupt required services. For this scenario, the targeted action is: Correlate encrypted flow characteristics with endpoint, DNS, and identity context rather than assuming encrypted payloads are visible to ordinary sensors. Situation: A device sends frequent small HTTPS bursts to a suspicious host while TLS decryption is prohibited by company privacy policy.
Diagnose VPN setup failures in phase order by comparing peer reachability, authentication identities, and mutually supported IKE and IPsec proposals. This response applies to FTD IKE negotiation failure isolation, not the controlling requirement in this case. Tunnel establishment progresses through distinct authentication and negotiation stages; changing unrelated firewall rules cannot fix mismatched proposals. For this scenario, the targeted action is: Correlate encrypted flow characteristics with endpoint, DNS, and identity context rather than assuming encrypted payloads are visible to ordinary sensors. Situation: A device sends frequent small HTTPS bursts to a suspicious host while TLS decryption is prohibited by company privacy policy.
Collect and analyze flow-level metadata to identify communication patterns and suspicious volume while acknowledging payload visibility limits. This response applies to NetFlow and telemetry flow analysis, not the controlling requirement in this case. Flow telemetry summarizes communicating endpoints and counters; packet payload inspection requires different data sources. For this scenario, the targeted action is: Correlate encrypted flow characteristics with endpoint, DNS, and identity context rather than assuming encrypted payloads are visible to ordinary sensors. Situation: A device sends frequent small HTTPS bursts to a suspicious host while TLS decryption is prohibited by company privacy policy.


