Which Cisco Secure Firewall Threat Defense interface mode must be deployed when implementing an IPS...

An inline set consists of paired Secure Firewall Threat Defense interfaces placed directly in the network traffic path. The interfaces operate like a bump in the wire: one interface receives the traffic, the inspection engine evaluates it, and the paired interface retransmits it unless an access-control, intrusion, file, or other security policy explicitly drops it. This arrangement enables the IPS to prevent attacks because the device can stop malicious packets before forwarding them. A passive interface also receives traffic unconditionally, but it receives copied traffic from a SPAN or mirror port and retransmits none of it. Routed and transparent modes describe broader firewall packet-forwarding behavior rather than this IPS-only interface characteristic. Therefore, an inline deployment satisfies the requirement to inspect, retransmit, and selectively drop traffic. Cisco inline-set documentation

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