300-710 SNCF Deployment — Timed 20 Questions

Question 1

An engineer has deployed a Cisco Secure Firewall Threat Defense in transparent firewall mode. Users on the inside segment report they cannot reach a server on the outside segment. The engineer verifies that the BVI (Bridge Virtual Interface) has an IP address in the same subnet as the internal hosts and default gateway. What is a likely reason for traffic being dropped?

20 minute time limit — choose an answer to begin.

Accepted Answer

An EtherType access list is blocking the encapsulated traffic or ARP requests between the bridge groups.. In transparent mode, the FTD bridges traffic between interfaces in the same bridge group, and an EtherType access list controls which non-IP EtherTypes (including ARP, 0x0806) are permitted across the bridge. If the EtherType ACL is missing or misconfigured, ARP resolution and other L2 traffic are dropped, breaking connectivity even though the BVI is correctly addressed. This is the classic cause of silent drops in transparent deployments.

Answer

An explicit Access Control Policy rule is blocking the traffic, because transparent mode inspections still require standard ACP rules.

Answer

The security zones for the inside and outside interfaces are identical, causing an implicit intra-zone drop.

Answer

Dynamic routing protocols must be enabled on the BVI to advertise the transparent subnet upstream.

Question 2

An organization is planning to deploy a Cisco Secure Firewall Threat Defense Cluster using three Secure Firewall 9300 security modules to handle a massive aggregate throughput requirement. Which consideration is critical when designing this cluster?

Accepted Answer

All security modules in the cluster must be identical in model, memory, and interface module composition.. In a firewall cluster, one unit is automatically elected as the control node, while the others act as data nodes. All units share a common configuration and distributed connection table, but session handling is managed across the cluster nodes via a central cluster control link.

Answer

Cluster nodes can be spread across different geographical data centers over high-latency WAN links.

Answer

The control node processes all data traffic while data nodes only handle control plane heartbeats.

Answer

Clustering requires transparent mode; routed mode is unsupported on clustered Secure Firewall platforms.

Question 3

An administrator is deploying a Cisco Secure Firewall Threat Defense Virtual (FTDv) in Microsoft Azure. The architecture calls for a 3-NIC deployment (Management, Inside, and Outside). After deployment, asymmetric routing issues are observed because Azure Load Balancer is forwarding return traffic directly back to a different backend instance. What configuration must be applied to prevent asymmetric drops?

Accepted Answer

Configure Source NAT (SNAT) on the FTDv so that traffic appears to originate from the firewall interface IP, ensuring symmetrical return paths.. In Azure, the Load Balancer can distribute flows such that the return path traverses a different backend instance, causing asymmetric routing. Configuring Source NAT (SNAT) on the FTDv makes outbound traffic appear to originate from the firewall's interface IP, so return traffic is directed back to the same firewall instance that processed the original flow. This ensures symmetric flow handling and prevents the firewall from dropping packets due to asymmetric routing.

Answer

Enable Strict Asymmetric Routing Bypass mode in the FTDv Advanced Firewall Settings.

Answer

Disable the Azure UDR (User Defined Route) on the inside subnet.

Answer

Convert the FTDv deployment from routed mode to transparent mode.

Question 4

An administrator is deploying a Cisco Secure Firewall Threat Defense Virtual (FTDv) on-premises using a KVM hypervisor. During the initial deployment, the virtual machine fails to boot and console logs indicate an issue with interface mapping. What is a key requirement for physical interface mapping on KVM-based FTDv deployments?

Accepted Answer

Interface eth0 must be dedicated exclusively to the management network, and data interfaces must follow a strict sequential mapping starting with eth1.. For KVM-based FTDv deployments, Cisco requires that the first virtio NIC (eth0) be dedicated solely to the management interface, and that data interfaces be mapped sequentially starting at eth1 (eth1, eth2, etc.) in the order they appear in the KVM XML/domain definition. This strict mapping ensures the FTDv guest OS enumerates interfaces predictably so the management bootstrap and data-plane configuration apply to the correct vNICs. If eth0 is shared or data interfaces are out of order, the VM fails to boot or the console shows interface mapping errors.

Answer

KVM requires SR-IOV drivers for the management interface only.

Answer

Management must be mapped to eth2 while data interfaces use eth0 and eth1.

Answer

All interfaces must be bundled into a single virtio bridge without VLAN tagging.

Question 5

An administrator is troubleshooting a Cisco Secure Firewall Threat Defense high availability deployment where MAC address persistence is causing intermittent packet drops after a failover event. What is the role of MAC address persistence in an HA setup?

Accepted Answer

It ensures that the active unit retains the virtual MAC addresses of the interfaces, preventing the need for downstream switches to relearn MAC-to-port mappings.. MAC persistence ensures that the active firewall unit takes over the virtual MAC addresses of the HA pair, ensuring downstream switches immediately update their MAC forwarding tables without waiting for aging timers.

Answer

It encrypts the MAC header of all packets crossing the stateful failover control link.

Answer

It forces downstream Layer 2 switches to continuously flood broadcast traffic to both firewall nodes simultaneously.

Answer

It locks the management IP address to a static MAC address to prevent ARP spoofing attacks.

Question 6

An engineer is configuring dynamic routing using OSPF on a Cisco Secure Firewall Threat Defense device managed by FMC. Which TWO configuration steps are required to establish an OSPF adjacency? (Choose two)

Accepted Answer

Create an OSPF routing process and define the OSPF area ID in FMC under Device Routing settings.. OSPF setup on FTD requires enabling the OSPF process globally and configuring the specific interfaces within the area with correct parameters.

Answer

Set the firewall operating mode to passive NGIPS.

Answer

Configure the management interface as an OSPF passive interface.

Answer

Configure a Bridge Virtual Interface (BVI) for every OSPF neighbor.

Question 7

An administrator is deploying Cisco Secure Firewall Threat Defense Virtual (FTDv) in an enterprise cloud environment (such as AWS or Azure). Which THREE considerations are unique to cloud-based firewall deployments compared to physical hardware deployments? (Choose three)

Accepted Answer

The administrator must manage cloud provider route tables (e.g., AWS Route Tables or Azure UDRs) to steer traffic through the firewall ENIs.. Option B is correct because in cloud deployments the FTDv does not sit inline on a physical wire; instead, traffic must be redirected to the firewall's elastic network interfaces (ENIs) by modifying the cloud provider's routing constructs, such as AWS VPC Route Tables or Azure User-Defined Routes (UDRs), which is a task that has no equivalent in physical appliance deployments. Option C is correct because the cloud instance type (e.g., AWS c5.xlarge or Azure Standard_D8s_v3) determines the vCPU, memory, and number of network interfaces available, which in turn caps the maximum supported throughput and interface count, unlike physical hardware where you select a fixed appliance model with known specifications. Option D is correct because FTDv in cloud marketplaces supports both Bring Your Own License (BYOL) and Pay-As-You-Go (PAYG) licensing models integrated with the cloud provider's billing, a purchasing and licensing flexibility that does not exist for physical hardware. Option A is incorrect because physical hardware bypass network interface modules are not applicable to virtual deployments; FTDv uses virtual NICs provided by the hypervisor or cloud provider, not installable hardware bypass modules. Option E is incorrect because FTDv in the cloud typically operates in routed mode (or policy-based routing) with separate management and data interfaces, not transparent mode with BVI grouping, which is a configuration used in specific physical inline scenarios.

Answer

Physical hardware bypass network interface modules must be manually installed into the virtual hypervisor slot.

Answer

FTDv in the cloud requires transparent mode with BVI grouping for all data interfaces.

Question 8

An administrator is planning an Active/Standby High Availability deployment for two Cisco Secure Firewall Threat Defense devices managed by FMC. Which THREE prerequisites must be satisfied before configuring the HA pair? (Choose three)

Accepted Answer

A dedicated link must be available to serve as the stateful failover control and health monitoring link.. Option A is correct because an Active/Standby FTD HA pair requires a dedicated failover link (a separate interface/subnet) used for stateful failover replication and health monitoring heartbeats between the peers. Option C is correct because both FTD appliances must run the identical software version and patch level so that the HA state machine, configuration sync, and failover messaging are compatible. Option D is correct because the two chassis must be the same hardware model with matching interface counts and module types so that the failover link, interface mapping, and configuration replication work symmetrically. Option B is not required; the secondary unit's management IP can be higher or lower than the primary's, as long as both are unique and reachable by FMC. Option E is incorrect because FTD HA supports routed mode (and transparent mode), so transparent mode is not a prerequisite.

Answer

The secondary unit must have a higher management IP address than the primary unit.

Answer

Both firewalls must be configured in transparent mode; routed mode is unsupported in HA.

Question 9

An engineer is setting up a Cisco Secure Firewall Threat Defense cluster. Which TWO statements accurately describe the architecture and behavior of FTD clustering? (Choose two)

Accepted Answer

One unit is elected as the control node, while the other units function as data nodes sharing the processing load.. Clustering combines multiple devices into a single logical entity with a control node and data nodes, sharing configuration and connection tables.

Answer

Clustering is exclusively supported on virtual machine instances and cannot be used on physical appliances.

Answer

Data nodes do not process any traffic; they remain idle until the control node fails.

Answer

Clustering can be established across different cities over high-latency WAN connections.

Question 10

An engineer needs to deploy a Cisco Secure Firewall Threat Defense in transparent firewall mode. Which TWO statements describe characteristics of transparent mode? (Choose two)

Accepted Answer

The firewall operates as a Layer 2 bridge, forwarding frames based on destination MAC addresses.. Transparent mode bridges traffic across interfaces in a bridge group using BVIs, acting as a stealth firewall at Layer 2.

Answer

Every interface in transparent mode must have a unique Layer 3 subnet IP address for routing.

Answer

NAT is fully unsupported across all transparent firewall deployments.

Answer

Dynamic routing protocols like OSPF and EIGRP are fully supported on BVI interfaces.

Question 11

An enterprise network architect is designing high availability for Cisco Secure Firewall Threat Defense using static route tracking and IP SLA. Which THREE components are essential for implementing robust static route tracking? (Choose three)

Accepted Answer

An IP SLA monitor or BFD session configured to periodically ping or probe the target next-hop IP address.. Static route tracking on Cisco Secure Firewall Threat Defense relies on three essential building blocks. Option A is correct because an IP SLA monitor (or BFD session) must actively probe the target next-hop IP address so the device has a live reachability signal to act on. Option B is correct because a tracking object is required to reference that IP SLA operation and translate its results into an up/down state that route processing can consume. Option E is correct because the backup static route must be configured with a higher administrative distance/metric and bound to the tracking object, so it is installed only when the primary route's tracked object goes down. Option C is not needed because BGP peering on the management interface is unrelated to static route tracking. Option D is not needed because a cluster control link across three modules concerns clustering, not static route tracking.

Answer

A BGP peer group session terminating on the firewall management interface.

Answer

An active cluster control link across three physical security modules.

Question 12

An engineer is designing a high-availability architecture utilizing Equal-Cost Multi-Path (ECMP) routing with Cisco Secure Firewall Threat Defense units. Which THREE characteristics or limitations apply to ECMP on FTD? (Choose three)

Accepted Answer

ECMP distributes traffic across multiple equal-cost next-hop routes to optimize bandwidth utilization and path redundancy.. ECMP on FTD balances traffic across multiple paths, requires dynamic routing protocols like OSPF/BGP or static routes, and hashes flows based on packet headers.

Answer

ECMP is restricted exclusively to transparent firewall deployments and cannot be used in routed mode.

Answer

ECMP automatically synchronizes state tables between independent firewall appliances without requiring an HA control link.

Question 13

An administrator is preparing to deploy Cisco Secure Firewall Threat Defense in passive NGIPS mode connected to a Catalyst switch. Which TWO configuration steps on the switch and firewall are necessary for successful packet inspection? (Choose two)

Accepted Answer

Configure the firewall data interfaces to operate in passive mode so they do not attempt to forward or drop traffic.. Option A is correct because in passive NGIPS mode the Threat Defense data interfaces must be explicitly configured as passive (e.g., via the passive interface setting in the FTD platform settings), which makes them receive-only so the sensor inspects copies of traffic without forwarding, dropping, or modifying packets. Option C is correct because a Catalyst switch must deliver the traffic to those passive interfaces using a SPAN or RSPAN session that mirrors the relevant source ports or VLANs to the firewall's monitoring port, since passive interfaces cannot receive traffic through normal switching. Options B, D, and E are incorrect: OSPF routing is irrelevant to a receive-only monitoring interface, a default gateway is unnecessary because passive interfaces do not originate or return traffic, and inline sets with hardware bypass apply to inline IPS deployments, not passive NGIPS.

Answer

Enable dynamic OSPF routing between the switch and the firewall's passive interface.

Answer

Assign a default gateway IP address to the passive interface to route return packets back to clients.

Answer

Configure an inline set pairing the passive interfaces with a hardware bypass module.

Question 14

An engineer is deploying a Cisco Secure Firewall Threat Defense in routed mode and must configure an internal interface connected to a data center segment. The requirement is to route traffic at Layer 3 while keeping the firewall transparent to the MAC addresses of the hosts. Which action should the engineer perform on the interface setting in Cisco FMC?

Accepted Answer

Configure the interface as a routed interface with an IP address, relying on standard Layer 3 routing.. In routed mode, each interface is assigned an IP address and acts as a Layer 3 gateway, so the firewall rewrites MAC addresses as it forwards traffic between subnets. This is the standard configuration for a data center segment that requires L3 routing while the firewall remains transparent to host MAC addresses because it uses its own interface MACs. The engineer should configure the interface as a routed interface with an IP address.

Answer

Set the operational mode of the interface to inline set for passive inspection without MAC rewriting.

Answer

Configure the interface as a BVI member to bridge the traffic across the subnet.

Answer

Enable the passive tap option on the physical port to monitor the data center segment out-of-band.

Question 15

An administrator is configuring an NGIPS deployment using a Cisco Secure Firewall Threat Defense inline set. Traffic needs to be analyzed, but certain trusted bulk data transfers should bypass the Snort inspection engine without breaking the inline flow. Which feature should the administrator configure?

Accepted Answer

Enable an Inline Set with Snort Bypass enabled so traffic passes through the hardware interface pair without inspection when Snort is busy.. Inline Bypass or Advanced Inspection and Prevention settings allow traffic to bypass Snort inspection under specific conditions. Specifically, Snort performance overload or configured bypass settings on inline sets can drop or pass traffic without inspection.

Answer

Deploy a BVI interface pair in transparent mode with asymmetric routing enabled.

Answer

Configure a Network Analysis Policy (NAP) to use the Inline Tap mode for the specific VLAN range.

Answer

Configure an Access Control Policy rule with the action set to Trust, combined with an Intrusion Policy set to drop.

Question 16

A network security engineer is setting up a high availability (HA) pair for two Cisco Secure Firewall Threat Defense devices managed by Cisco FMC. Which prerequisite condition must be met between the primary and secondary units before configuring the HA pair?

Accepted Answer

Both units must have different management IP addresses assigned to their respective management interfaces.. Before configuring an HA pair, both units must have the same exact model, identical license configurations, the same software version, and identical interface configurations/naming.

Answer

The primary unit must be configured in routed mode while the secondary unit is in transparent mode.

Answer

The secondary unit must be running a newer software version than the primary unit to support failover synchronization.

Answer

The data interfaces must use dynamic DHCP addressing to ensure seamless failover state transfer.

Question 17

An administrator is deploying Cisco Secure Firewall Virtual in a Microsoft Azure environment using automated templates. The deployment requires multiple network interfaces for management, internal, and external zones. How does Azure assign IP configurations to these virtual network interfaces (NICs)?

Accepted Answer

Azure assigns IP configurations via DHCP directly to each attached virtual NIC, which must correspond to the FMC interface settings.. In Microsoft Azure, each virtual NIC attached to a VM receives its IP configuration via DHCP from the Azure fabric, and the assigned addresses must match what is configured on the corresponding FMC interface objects. Azure does not allow arbitrary static IP assignment inside the guest OS for the primary IP configuration; the address is defined in the NIC's IP configuration in Azure and delivered via DHCP. This is why the FMC interface settings must align with the Azure-assigned IPs.

Answer

Azure relies on stateful ARP broadcasts to dynamically allocate IPs to virtual firewall subinterfaces.

Answer

IP addresses must be manually hardcoded inside the cloud-init script using API tokens.

Answer

The firewall assigns static IP addresses to the Azure fabric controllers via BGP peering.

Question 18

An engineer is preparing to deploy a Cisco Secure Firewall Threat Defense cluster in an enterprise data center. Which THREE requirements must be verified and configured prior to cluster initialization? (Choose three)

Accepted Answer

A dedicated high-speed, low-latency Cluster Control Link (CCL) must be connected between all nodes.. Option A is correct because the Cluster Control Link (CCL) is a dedicated, high-speed, low-latency network that carries cluster heartbeats, state synchronization, and forwarded traffic between nodes, and it must be connected between all cluster members before initialization. Option B is correct because Cisco Secure Firewall clustering requires all members to be the exact same physical or virtual model with identical interface counts and types so that configuration and failover behavior remain consistent across the cluster. Option E is correct because data interfaces on each cluster unit must be connected to upstream and downstream switches using EtherChannel/Port Channels, which the cluster uses as the distributed data plane for traffic forwarding and load balancing. Option C is incorrect because all cluster members must operate in the same firewall mode (routed or transparent); mixing modes across master and slave nodes is not supported. Option D is incorrect because all cluster members must run the same compatible software version, not different versions, to ensure consistent clustering behavior and avoid incompatibilities.

Answer

The cluster master must be configured in transparent mode while slave nodes operate in routed mode.

Answer

Each cluster member must run a different software version to prevent simultaneous kernel panics.

Question 19

An administrator is deploying a Cisco Secure Firewall Threat Defense High Availability pair. During the initial configuration in Cisco FMC, the administrator assigns specific priority values. How does the failover process use the primary and secondary unit designations and priorities?

Accepted Answer

The active unit is chosen based on health status, preemption settings, and designated failover priorities.. In an Active/Standby HA pair, the unit configured with the higher priority or designated role determines preemption and active state behavior when both units boot up simultaneously.

Answer

Both units actively share the workload in an active-active load-balanced state.

Answer

The unit designated as Primary always becomes Active, ignoring preemption or health status.

Answer

The unit with the lowest management IP address is automatically elected as Active.

Question 20

An administrator is deploying a new Cisco Secure Firewall Threat Defense device and needs to ensure that the firewall performs layer 3 routing while keeping the existing subnet architecture completely transparent to the upstream router. Which firewall mode must be selected during initial configuration?

Accepted Answer

Transparent mode. In transparent mode, the firewall acts like a Layer 2 bridge. The upstream and downstream networks remain in the same subnet, making the firewall transparent to layer 3 routing.

Answer

Inline mode

Answer

Routed mode

Answer

Passive mode