Cisco 300-710: Securing Networks with Cisco Firewalls (SNCF)

Analyze is not a standard selectable action in an FMC Access Control Policy rule. While FMC provides analysis capabilities (events, dashboards, connection and intrusion analysis), those are operational functions rather than rule actions. In an ACP rule, you choose actions like Allow, Block, Block with Reset, Trust, or Monitor, then optionally attach inspection policies.

Discover is not an ACP rule action. “Discovery” in FMC typically refers to visibility features such as network discovery, application identification, user identity correlation, and host profiling. These capabilities inform policy decisions and reporting, but they are not chosen as the rule’s action. The rule action still must be one of the defined enforcement/visibility actions.

Block ALL is not a discrete action type in an ACP rule. You can implement a “block all” outcome by creating a rule that matches any source/destination/service and setting the action to Block (or Block with Reset), or by setting the policy’s default action to block. The action itself remains Block/Block with Reset, not “Block ALL.”

Transparent inline mode means the device operates inline at Layer 2, bridging traffic rather than routing it. Although it can be less visible from an addressing perspective, it is still an active inline deployment where traffic passes through the device and can be blocked. That is not the same as emulating a passive interface. The keyword here is transparent forwarding, not passive monitoring.

Strict TCP enforcement is a traffic inspection setting that validates TCP session behavior and drops packets that violate expected TCP state rules. It affects how the firewall inspects and enforces traffic policy, not whether the interface behaves passively. This feature is about protocol normalization and security hardening. It has no role in making an interface emulate passive monitoring behavior.

Propagate link state causes one interface in an inline pair to reflect the link condition of the other side so adjacent devices can detect failures and reconverge. This is a physical/link-state signaling feature used for resiliency and failover behavior. It does not make the interface passive or convert the deployment into a monitoring-only mode. Therefore it does not match the question’s wording about emulating a passive interface.

SSL/TLS is frequently inspected in Firepower, but it is primarily addressed through SSL policies (decryption, certificate handling, and session identification) rather than being a classic “application-layer preprocessor” like IMAP or CIFS. Without decryption, payload visibility is limited; with decryption, the underlying application (HTTP, IMAP, etc.) is what the application preprocessors typically parse.

DNP3 is an industrial control/SCADA protocol used in OT environments. While some security platforms provide DNP3 awareness via specialized rules or inspectors, it is not typically categorized in exam-focused Snort/Firepower lists as a standard application-layer preprocessor alongside protocols like IMAP/SMTP/FTP/SMB. It can be a distractor because it is an application protocol, but not a common preprocessor answer here.

ICMP is a network-layer control protocol (Layer 3) used for diagnostics and error reporting (echo request/reply, unreachable, time exceeded). In Snort/Firepower, ICMP is handled by IP/ICMP decoding and general detection rules, not by an application-layer preprocessor. It lacks the kind of application command semantics that preprocessors like IMAP or CIFS are designed to parse.

Incorrect. OSPFv2 is an IPv4 routing protocol; IPv6 uses OSPFv3. The phrase “OSPFv2 with IPv6 capabilities” is a common distractor that conflates the two protocol versions. In FMC/FTD, IPv6 routing would be handled via OSPFv3 configuration rather than an “IPv6-capable OSPFv2” feature.

Incorrect. While SHA-based authentication exists in some routing/security designs, OSPF authentication in FMC-managed FTD is typically implemented using simple password or MD5 for OSPFv2. SHA authentication is not a commonly exposed/supported OSPF authentication option in FMC for FTD, making it a likely distractor.

Incorrect. Type 1 LSAs are router LSAs and are fundamental within an area; “Type 1 LSA filtering at an ABR” is not a typical, broadly supported or exposed feature in FMC for FTD OSPF. FMC generally provides core OSPF configuration (areas, interfaces, authentication, summarization where applicable) rather than granular LSA filtering controls.

Incorrect. Cisco firewall QoS configurations generally are not automatically disabled just because the configured rate exceeds the interface’s maximum throughput. The device typically accepts the policy, but the policer never becomes the limiting factor. Disabling would imply validation logic that treats the value as invalid, which is not the typical behavior tested in SNCF-style questions.

Incorrect. QoS rate limiting is applied to the traffic that matches the specific QoS class/rule, not to all traffic system-wide. Even if a policer were mis-sized, it would not cause the firewall to start rate-limiting unrelated flows. Global rate limiting would require a separate configuration or platform-wide resource constraint, not merely an oversized policer value.

Incorrect. While some platforms may log certain QoS-related issues, configuring a rate limit above interface throughput is not typically treated as an error condition that generates repeated warnings. It is simply an ineffective policy parameter. The more common operational symptom is “no observable policing drops,” not continuous warning messages.

“configure high-availability resume” is used to restart HA participation after it has been suspended. It is the inverse of suspend. Because the question asks how to temporarily stop running HA (not how to restart it), resume is not correct. On exams, “resume” typically appears as a distractor when the scenario is about pausing HA for maintenance.

`configure high-availability disable` is not the command used in this context to temporarily stop HA on the primary Cisco FTD unit. The exam objective is testing the reversible operational command, which is `suspend`, not a disable action. When Cisco asks for a temporary stop of HA participation, `suspend` is the precise command expected.

“system support network-options” is a troubleshooting/support command area and is not used to control HA state. It may be used to adjust low-level network behaviors for diagnostics, but it does not suspend or disable HA. This option is a classic exam distractor: it sounds administrative but is unrelated to HA runtime control.

Incorrect. This describes a routing/path asymmetry or traceroute-like behavior (destination responding via a different path). Packet capture trace does not test network paths or validate return-path symmetry; it focuses on how the firewall processes the packet it sees. Path validation is typically done with routing tables, traceroute, or flow/connection diagnostics, not capture trace.

Incorrect. Limiting the number of packets captured is handled by capture parameters such as packet count, buffer size, file size, duration, or ring buffer settings. The trace option does not primarily control capture volume; it adds processing/decision metadata. While enabling trace may affect performance considerations, it is not a mechanism to limit packet quantity.

Incorrect. Packet capture inherently captures the packet contents (headers and payload up to snap length). “Trace” is not simply “more details of each packet” in the sense of deeper decode; it adds firewall decision/disposition context (allowed/dropped and related processing information). Detailed decoding is typically done by analyzing the pcap in tools like Wireshark.

Incorrect. A passive interface applies to tap/SPAN-style monitoring where the sensor receives a copy of traffic and cannot enforce blocking. Inline deployment specifically needs an inline interface pair/set, not a passive interface. Also, omitting security zones makes policy scoping difficult or ineffective in FMC, so this does not meet minimum inline requirements.

Incorrect. While inline interfaces, MTU, and mode are essential, leaving out security zones is a key gap for a managed FMC deployment because ACP rules typically rely on source/destination zones to match and enforce policy. Without zones, traffic classification and rule design become limited and can lead to unintended default handling.

Incorrect. This mixes passive interface with inline requirements. Passive interfaces are for monitoring-only deployments and do not create a bridging path through the device. Inline deployments require inline interface pairs/sets. Although security zone, MTU, and mode are relevant concepts, the presence of “passive interface” makes this option wrong for an inline deployment question.

HSRP is a Cisco first-hop redundancy protocol that provides a virtual default gateway IP/MAC for hosts. It solves Layer 3 gateway availability (active/standby router) but does not prevent Layer 2 loops or manage redundant switch links. In a purely switched Firepower deployment, HSRP is not the mechanism that establishes redundancy of the switched topology.

GLBP is a Cisco first-hop redundancy protocol that provides both gateway redundancy and load balancing across multiple routers by using multiple virtual MAC addresses. Like HSRP, it operates at Layer 3 for default gateway resilience and does not control Layer 2 forwarding paths or prevent loops. It is not the correct protocol for redundancy in a switched Firepower deployment.

VRRP is an open-standard first-hop redundancy protocol similar to HSRP, providing a virtual default gateway with master/backup roles. It addresses Layer 3 gateway redundancy, not Layer 2 loop avoidance or redundant switched links. In switched Firepower deployments where redundancy is about alternate L2 paths, VRRP is not the correct answer.

1024-bit RSA keys are considered cryptographically weak and are deprecated by most modern security standards and TLS implementations. Many platforms reject 1024-bit certificates outright or require legacy/weak settings that are not acceptable in enterprise environments. On exams, 1024 is commonly included as a distractor to test awareness of modern minimum key sizes.

8192-bit RSA keys provide higher theoretical security but impose significant CPU overhead during TLS handshakes and are rarely supported on management-plane products. For Cisco FMC, 8192-bit is beyond the typical validated/supported maximum. This option is a classic distractor: “bigger must be better,” but not necessarily supported or operationally practical.

2048-bit RSA is the most common minimum/baseline key size used today and is widely recommended for compatibility and performance. However, the question asks for the maximum supported bit size, not the recommended minimum. 2048 is therefore plausible but incorrect because FMC supports larger keys up to 4096-bit.

Incorrect. Port objects do not represent protocols other than TCP and UDP in the general sense. Protocols such as GRE, ESP, and OSPF do not use ports, so FMC matches them through protocol-specific fields or IP protocol numbers rather than port objects. ICMP is also handled differently, using type and code rather than ports. Therefore this option incorrectly extends port objects beyond their intended Layer 4 use.

Incorrect. Cisco FMC does not represent all protocols in the same way because different protocols expose different header fields for matching. TCP and UDP use source and destination ports, ICMP uses type/code, and other IP protocols are identified by protocol number or application awareness. Port objects are only one of several object types and are not a universal abstraction for every protocol. This makes the statement technically false.

Incorrect. Source port conditions in FMC access control rules are meaningful only for protocols that actually have source ports, namely TCP and UDP. Protocols other than TCP or UDP do not have source port fields, so they cannot be added through port objects for source port matching. FMC instead uses other criteria such as IP protocol, application, or ICMP-specific matching for those cases. This option misunderstands how non-TCP/UDP traffic is evaluated.

Inline set is used when the FTD is actively deployed in the traffic path with paired interfaces forwarding production traffic. It is intended for active inspection and enforcement, such as blocking or dropping traffic based on policy. Because it is an enforcement-oriented inline mode rather than a passive observation mode, it does not best match the requirement in the question. This option is a common distractor because both inline set and inline tap involve traffic traversing the appliance.

Passive sounds conceptually close, but it is not the specific Cisco FTD interface mode name being tested here. Cisco uses the term inline tap for the passive inline monitoring deployment model. Exam questions often distinguish between a generic description and the exact configuration term used in the product. Therefore, passive is not the best answer even though the behavior described is passive in nature.

Routed mode makes the FTD a Layer 3 forwarding device with IP-addressed interfaces participating in routing. In this deployment, the appliance is an active network hop and can enforce firewall and IPS policy on traffic it forwards. That is fundamentally different from passively observing traffic that passes through the appliance. Routed mode is therefore incorrect for a passive monitoring requirement.

EIGRP is a Cisco proprietary dynamic routing protocol, but it is not natively configurable in FMC for FTD in the same way OSPF/BGP are. If EIGRP is needed, it has historically required FlexConfig (ASA-style CLI injection) or may be unsupported depending on the FTD version/platform. Because the question explicitly forbids FlexConfig, EIGRP is not a correct choice.

Static routing is supported on FTD and is configured in FMC, but it is not a dynamic routing protocol. Static routes do not form adjacencies, exchange topology information, or automatically reconverge based on routing protocol logic. Since the question asks specifically for dynamic routing protocols, static routing is incorrect even though it is commonly used.

IS-IS is a dynamic IGP often used in service provider and large enterprise cores, but it is not exposed as a native routing option in FMC for FTD. Implementing IS-IS would typically require FlexConfig (if available) or may not be supported at all on certain FTD releases. Therefore, IS-IS is not correct when FlexConfig is not allowed.

Incorrect. Creating a URL object and blocking the site in policy is a valid local mitigation, but it is not the best answer to how the issue will be addressed globally. It requires manual administrative action in a specific environment and does not represent the broader Cisco intelligence process that updates protections across deployments. The question’s wording points to a global response mechanism rather than a custom local workaround.

Incorrect. Denying outbound web access would certainly reduce the chance of additional malware downloads, but it is far too disruptive and does not meet the requirement for the least amount of impact. It also blocks legitimate business traffic and is not a targeted response to a single malicious website. Exam questions with this phrasing generally reject broad shutdown actions unless no other containment option exists.

Incorrect. Isolating the endpoint may be appropriate for incident response on a compromised host, but it does not solve the problem globally. Other users and systems could still access the same malicious website and be infected. The question asks for a broad, low-impact solution, which makes host isolation too narrow in scope.

Inline set refers to pairing interfaces for inline traffic inspection/IPS-style deployment where the device is in the forwarding path and can drop traffic. While it can be used to insert inspection without changing IP addressing in some designs, it is not the primary FTD interface mode that explicitly avoids routing and VLAN rewriting. The exam cue about routing/VLAN points to transparent (L2 bridge) mode instead.

Passive mode means the sensor/firewall receives a copy of traffic (SPAN/TAP) and analyzes it without being able to enforce blocking on the live traffic path. It certainly avoids routing changes because it is not forwarding traffic at all, but it also does not meet the typical intent of “traffic passing through the appliance” being inspected and controlled. It’s monitoring-only, not an in-path forwarding mode.

Inline tap is a deployment where the device is connected in a way that it can see traffic (often both directions) similarly to a tap, but typically it is used for visibility/inspection rather than classic L2 bridging as a firewall mode. It is not the standard FTD mode described by Cisco for eliminating routing requirements; transparent mode is the canonical answer for “no routing/VLAN changes” while still forwarding traffic.

Changing server IP addresses while staying in the same subnet does not create segmentation. Clients can still reach servers directly at Layer 2 (ARP and switch forwarding) because they remain in the same broadcast domain. Security policy enforcement requires controlling the traffic path (forcing it through a firewall) or separating the network (VLAN/subnet changes), neither of which is achieved by simply renumbering hosts within the same subnet.

A routed-mode firewall requires each firewall interface to be in a different IP subnet (or at least requires Layer 3 adjacency and gateway changes). If clients and servers must remain on the same Layer 3 network and you cannot readdress, you cannot place a routed firewall “between” them without changing default gateways, introducing new subnets, or redesigning VLANs. Routed mode is ideal for inter-subnet segmentation, not same-subnet separation.

Changing client IP addresses while remaining on the same subnet also fails to provide segmentation. The underlying issue is that clients and servers share the same Layer 2 domain, allowing direct communication without traversing a policy enforcement point. Renumbering clients within the same subnet does not alter the forwarding behavior, does not introduce a choke point, and does not meet compliance segmentation requirements.

Changing the intrusion policy from Security to Balanced only alters IPS inspection behavior and signature tuning. It may reduce false positives, but it does not stop the access control policy from denying traffic, nor does it guarantee IPS will never drop a packet. The requirement is absolute, so a tuning change is insufficient. This option addresses inspection sensitivity, not exemption from enforcement.

A Trust policy is not the same as Firewall Bypass and does not provide the strongest guarantee that traffic can never be denied. Trust is used to fastpath or reduce inspection for selected traffic, but it is still not the exam-best answer when the requirement explicitly says traffic must never be denied. Cisco uses bypass for traffic that must be exempt from the firewall decision path entirely. Therefore, Trust is too weak and too ambiguous for this requirement.

A NAT policy only changes packet addressing information such as source or destination IP values. It does not create authorization to pass traffic through the firewall, and translated traffic can still be blocked by ACP, IPS, Security Intelligence, or other controls. NAT is a connectivity and translation feature, not a guarantee against denial. Therefore, it cannot satisfy the stated business requirement.

ERSPAN is a method to mirror traffic over an IP network using GRE encapsulation (remote SPAN). It describes how mirrored packets are transported from a switch to a collector, not the FTD’s interface mode. FTD can potentially consume mirrored traffic, but the interface mode that defines passive reception on the appliance is TAP, not ERSPAN.

Firewall mode on FTD is an inline deployment where the device is in the forwarding path and can enforce Access Control Policy actions (allow, block, trust), perform NAT, and apply advanced inspections. Because it forwards traffic between interfaces, it is not a passive receive-only mode and does not match the requirement.

IPS-only mode is intended for intrusion prevention focus, typically deployed inline so it can take prevention actions (drop/reset) based on intrusion policy. While it may reduce firewall features compared to full firewall mode, it is still generally in-path rather than passive. Therefore it does not meet the “passively receive” requirement.

Passive IDS ports only observe traffic and do not inherently isolate one department’s traffic from another. If both departments are monitored through passive interfaces without dedicated separation, their traffic can still be aggregated into the same monitoring workflow. That does not satisfy a strict privacy requirement. Passive IDS also lacks the explicit inline separation implied by the question’s focus on maintaining departmental privacy.

802.1Q inline set trunk interfaces can logically separate traffic using VLAN tags, but both departments still share the same physical inline set. That design is useful for interface conservation and multi-VLAN inspection, but it is not the most direct way to guarantee privacy between departments. Shared infrastructure introduces a common inspection path, which is weaker than dedicated inline sets for strict separation requirements. Therefore, trunking is a possible design option, but not the best answer to what must be configured for privacy.

Using one pair of inline set interfaces in TAP mode for both departments does not maintain separation by itself. TAP mode is intended for visibility and monitoring, not for isolating multiple departments on distinct inspection paths. If both networks feed the same TAP pair, their traffic can be seen together unless additional separation mechanisms are introduced. That fails the requirement to maintain data privacy between the two departments.