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Unsafe or unsupported shortcut for this firewall scenario: Treat changing firewall deployment mode as a zero-impact label update that requires no rollback or connectivity checks.

That option would choose passive monitoring for out-of-band visibility or supported inline prevention for enforcement, documenting maintenance failure behavior, but it addresses a different concern. Governing behavior: A deployment-mode conversion can materially alter network connectivity and device management, so it requires more than a cosmetic policy edit.

This alternative describes a different control, Traffic flow through routed interfaces with asymmetric return, rather than this scenario’s Change control when converting firewall deployment mode: Compare both-direction next-hop paths, connection entries, interface counters, captures and route lookup for representative session tuples.

That option would assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

That option would verify the chosen Threat Defense version and deployment mode support the proposed NAT and inspection features, then redesign and retest unsupported configurations, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

This alternative describes a different control, Traffic flow through routed interfaces with asymmetric return, rather than this scenario’s Passive NGIPS SPAN traffic visibility: Correct or deliberately accommodate supported asymmetric routing design so the firewall observes required stateful flows in both directions.

This alternative describes a different control, Passive versus inline inspection disruption planning, rather than this scenario’s Passive NGIPS SPAN traffic visibility: Passive sensing and inline enforcement differ in packet path and potential availability impact; neither automatically provides the other's capability.

Unsafe or unsupported shortcut for this firewall scenario: Assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic. It cannot establish the stated security outcome.

This alternative describes a different control, Transparent firewall bridge groups and BVI design, rather than this scenario’s Passive NGIPS SPAN traffic visibility: Transparent mode forwards between bridge-group member interfaces without becoming the conventional Layer 3 hop for bridged user traffic; a BVI can provide relevant routed management reachability.

Unsafe or unsupported shortcut for this firewall scenario: Assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic. It cannot establish the stated security outcome.

That option would inspect aggregation state, LACP neighbor and member state, physical counters and controlled flow load across the bundle, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

That option would compare both-direction next-hop paths, connection entries, interface counters, captures and route lookup for representative session tuples, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

This alternative describes a different control, HA active standby roles and failover triggers, rather than this scenario’s Passive NGIPS SPAN traffic visibility: A qualified standby assumes traffic handling upon monitored failure within the approved recovery objective.

This alternative describes a different control, NGIPS inline interface pair placement, rather than this scenario’s Passive NGIPS SPAN traffic visibility: Allowed sessions pass with expected latency and test-blocked signatures are prevented on the actual traffic path.

Unsafe or unsupported shortcut for this firewall scenario: Assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic. Case details: A security team wants to monitor east-west packets without affecting forwarding, but deploys a passive sensor expecting it to block attacks in line. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

That option would assume enabling a routed firewall automatically preserves Layer 2 adjacency and eliminates the need to plan reverse routing, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

That option would assume a fail-open link continuing to pass packets proves the IPS remains active and enforcing signatures, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

That option would assume transparent deployment automatically prevents switching loops and that a BVI must become every host's default gateway, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

This alternative describes a different control, NGIPS inline interface pair placement, rather than this scenario’s Passive NGIPS SPAN traffic visibility: Place the inline NGIPS interface pair directly in the intended traffic path and confirm bidirectional inspection and policy behavior.

This alternative describes a different control, Change control when converting firewall deployment mode, rather than this scenario’s Passive NGIPS SPAN traffic visibility: Perform a staged change plan with out-of-band recovery, configuration backups, validated target interface setup and explicit failback criteria.

Unsafe or unsupported shortcut for this firewall scenario: Assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic. It cannot establish the stated security outcome.

This alternative describes a different control, LACP port channels and logical interfaces, rather than this scenario’s Passive NGIPS SPAN traffic visibility: A port channel aggregates compatible physical links into a logical interface; one failed or mismatched member can reduce effective capacity or prevent bundling.

This alternative describes a different control, Change control when converting firewall deployment mode, rather than this scenario’s Passive NGIPS SPAN traffic visibility: A deployment-mode conversion can materially alter network connectivity and device management, so it requires more than a cosmetic policy edit.

Unsafe or unsupported shortcut for this firewall scenario: Assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic. Case details: A SPAN-fed NGIPS reports one-sided TCP transactions because the mirror configuration omits the return-direction VLAN. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

That option would review route table, equal-cost next hops, neighbor reachability and a set of traceable representative flows, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

Unsafe or unsupported shortcut for this firewall scenario: Assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic. Case details: A SPAN-fed NGIPS reports one-sided TCP transactions because the mirror configuration omits the return-direction VLAN. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving. Approved action: Connect a supported passive sensing interface to an accurately configured mirror or TAP feed and validate observed directional coverage. Independent evidence: Inspect SPAN or TAP source selection, observed flow directions, sensor receive counters and inspection events under a permitted test. Acceptance criterion: The sensor reports complete expected mirrored sessions while production traffic continues independently of sensor availability.

That option would review inline interface-pair membership, network diagrams, packet counters on both members and permitted versus test-blocked flows, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

This alternative describes a different control, Mode-specific NAT and policy assumptions, rather than this scenario’s Passive NGIPS SPAN traffic visibility: Only supported policies are deployed and traffic exhibits the documented address and inspection behavior for the selected mode.

This alternative describes a different control, Public cloud virtual firewall routing and traffic steering, rather than this scenario’s Passive NGIPS SPAN traffic visibility: Client and return traffic traverse the intended virtual appliance with routing and cloud policies permitting required service flows.

Unsafe or unsupported shortcut for this firewall scenario: Assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic.

Unsafe or unsupported shortcut for this firewall scenario: Assume a passive copy-based sensor can always drop the original attack packet or infer unmirrored return traffic.

That option would review logical packet path, appliance mode, interface fail-open or bypass support and controlled downtime tests, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.

That option would validate a loop-free transparent insertion, appropriate switch port roles and bridge-group membership before enabling intended inspection policies, but it addresses a different concern. Governing behavior: Passive inspection sees replicated traffic outside the forwarding path and generally cannot directly prevent the original packets from arriving.