300-710 SNCF Deployment — 100 Questions

Question 1

An administrator is troubleshooting a Stateful High Availability (HA) pair of Cisco Secure Firewall 4100 series devices managed by FMC. The units are failing to form an HA state, and logs indicate a state mismatch on the control link. Which underlying cause is most likely preventing the HA synchronization?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

One unit is running a slightly different maintenance patch release of FTD than its peer.. Firewall High Availability requires identical hardware models, identical interface counts/types, matching deployment modes (routed/transparent), and identical software/patch versions.

Answer

The MTU on the data interfaces differs by 4 bytes.

Answer

The stateful HA control link is configured across a routed switch interface instead of a direct cross-over cable.

Answer

The management IP addresses on the active and standby units are identical.

Question 2

An engineer is configuring static route tracking on a Cisco Secure Firewall Threat Defense to ensure high availability for outbound internet connectivity. A backup static route is configured with a higher metric. What mechanism does the firewall use to dynamically switch from the primary route to the backup route when the primary next-hop fails?

Accepted Answer

Bidirectional Forwarding Detection (BFD) or ICMP ping SLA trackers that monitor the next-hop IP.. Static route tracking utilizes Embedded Event Manager (EEM) or IP SLA monitoring (via ICMP/TCP probes) to track reachability, modifying the routing table dynamically when the probe fails.

Answer

STP topology change notifications received on the tracked interface.

Answer

FMC heartbeat loss detection between the firewall and the gateway.

Answer

Automatic generation of dynamic OSPF neighbor adjacencies over the static interface.

Question 3

You are deploying a Cisco Secure Firewall Threat Defense in an existing core network as an out-of-band intrusion prevention system. Which NGIPS deployment mode should you configure to ensure the firewall performs deep packet inspection and generates alerts without dropping any production traffic in the event of a device failure or high load?

Accepted Answer

Passive deployment mode using a SPAN or tap source. Passive mode listens to a mirrored traffic stream (e.g., via SPAN or TAP). It analyzes copies of packets and cannot drop live production traffic.

Answer

Transparent mode with inline bypass enabled

Answer

Inline deployment mode with fail-open enabled

Answer

Routed mode with asymmetric routing tolerance

Question 4

You are configuring an active/standby High Availability pair for Cisco Secure Firewall Threat Defense using FMC. You need to configure port channels for the data interfaces to increase bandwidth and redundancy. Which guideline must be followed regarding port channels in an HA deployment?

Accepted Answer

The port channel interfaces on both the primary and secondary units must have identical interface IDs and member port compositions.. Port channel configurations (EtherChannels) must be identically configured on both the active and standby units. The physical member ports must match across both firewalls.

Answer

LACP active mode is unsupported on HA secondary units; static port channels must be used instead.

Answer

Port channels are restricted to transparent mode HA configurations only.

Answer

Port channels can only be configured on the active unit; the standby unit automatically inherits them via stateful sync.

Question 5

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?

Accepted Answer

An EtherType access list is blocking the encapsulated traffic or ARP requests between the bridge groups.. In transparent mode, non-IP traffic is dropped by default unless EtherType rules are explicitly configured to allow protocols like BPDUs, MPLS, or IPX through the firewall bridge groups.

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 6

An enterprise network design incorporates Equal-Cost Multi-Path (ECMP) routing across two Cisco Secure Firewall Threat Defense units functioning independently in routed mode. What is the primary benefit of enabling ECMP on the firewalls?

Accepted Answer

It enables the firewall to balance outbound traffic across multiple next-hop gateways using multiple equal-cost routes.. ECMP allows the firewall to install multiple equal-cost paths to the same destination in its routing table, distributing traffic across multiple next-hop routers for load balancing and redundancy.

Answer

It allows passive NGIPS interfaces to share inspection load without SPAN replication.

Answer

It pools the CPU and memory resources of both firewalls into a single logical cluster.

Answer

It synchronizes connection state tables across both independent firewalls for zero-loss failover.

Question 7

An administrator is configuring a new Cisco Secure Firewall Threat Defense in routed mode on Firepower Device Manager (FDM). During the initial setup, the administrator needs to define the routing behavior for a multi-zone deployment. Which configuration step is mandatory when setting up routed mode?

Accepted Answer

Assign a unique Layer 3 IP address to each data interface and associate it with a security zone.. In routed mode, every interface must belong to a security zone and possess an IP address. Routed mode operates as a Layer 3 hop, unlike transparent mode which operates at Layer 2.

Answer

Disable the Snort inspection engine on all interfaces to allow bridging.

Answer

Assign a unique MAC address override to every physical interface.

Answer

Create a BVI (Bridge Virtual Interface) for each pair of physical interfaces.

Question 8

An administrator is configuring an inline interface pair on a Cisco Secure Firewall Threat Defense device using Cisco FMC. The business requires that if the firewall experiences a power failure or kernel panic, traffic must continue to flow uninterrupted through the network segment. Which action should the administrator take?

Accepted Answer

Configure the inline set with the 'Fail Open' setting and ensure hardware bypass is supported and enabled on the network module.. Hardware bypass capability (fail-open) on supported Network Interface Modules (NIMs/SMs) allows physical optical or copper paths to bridge automatically when power is lost or the Snort engine crashes.

Answer

Set up a redundant EtherChannel with LACP fast-rate timers.

Answer

Deploy the interfaces in a Bridge Virtual Interface (BVI) group with spanning tree disabled.

Answer

Configure the inline set with the 'Fail Close' setting and enable STP root guard.

Question 9

An engineer is deploying a Cisco Secure Firewall Threat Defense Virtual (FTDv) instance in an Amazon Web Services (AWS) VPC. The deployment requires the FTDv to inspect traffic crossing between public and private subnets. Which AWS architectural construct is mandatory for routing traffic through the FTDv instance?

Accepted Answer

Custom AWS Route Tables associated with the subnets, pointing traffic destined outside the VPC to the FTDv data interface ENI.. In public cloud deployments like AWS, routing traffic through a firewall appliance requires updating AWS Route Tables to point default or specific subnet traffic to the Elastic Network Interface (ENI) of the firewall's internal/external interfaces.

Answer

Cisco TrustSec Security Group Tags (SGTs) applied to AWS security groups.

Answer

AWS Transit Gateway with static BGP peering enabled to the FTDv management interface.

Answer

Physical bypass NICs installed in the AWS hypervisor layer.

Question 10

When registering a new Cisco Secure Firewall Threat Defense device to Cisco Defense Orchestrator (CDO) or Cisco FMC, what is the primary prerequisite protocol or connectivity requirement that must be established from the managed device toward the management platform?

Accepted Answer

Outbound TCP connection on port 8305 from the FTD to the manager's IP address or registration FQDN.. Managed devices initiate outbound secure communication (typically over TCP port 8305 / sftunnel) to the management platform (FMC or CDO).

Answer

An active SNMPv3 trap receiver configured on the manager pointing to the FTD.

Answer

Inbound SSH access from the management platform IP address to the firewall management interface.

Answer

An IPSec site-to-site VPN tunnel terminating on the data interfaces.

Question 11

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 12

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.. Cloud deployments utilizing load balancers often require enabling SNAT (Source NAT) on the firewall so that return traffic flows back through the exact same firewall instance, preventing asymmetric drop behavior.

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 13

An administrator is setting up a high availability pair of Cisco Secure Firewall devices. During the HA configuration wizard in FMC, the administrator is asked to provide a registration key. What is the purpose of this key?

Accepted Answer

It provides mutual authentication and establishes the secure trust relationship between the primary and secondary units.. The registration key (shared secret) is used to securely authenticate and encrypt the initial communication channel between the primary and secondary units during the HA pairing process.

Answer

It authorizes the FMC to push the initial bootstrap image to the standby unit.

Answer

It decrypts encrypted payloads passing across the stateful data links.

Answer

It unlocks the advanced clustering license on both firewalls.

Question 14

An engineer has deployed an active/standby High Availability pair of Cisco Secure Firewall Threat Defense devices. A failure occurs on the active unit, and a failover successfully takes place. However, upon recovery of the original active unit, it immediately resumes its role as the active unit, causing a brief secondary interruption. Which failover setting governs this behavior?

Accepted Answer

Failover Preempt Configuration. The 'Preempt' setting dictates whether a recovered primary unit will reclaim its active role from the current active unit. By default, preemption may be enabled or disabled depending on configuration preferences.

Answer

MAC Address Persistence Timer

Answer

HEMS Poll Frequency

Answer

Stateful Failover Sync Interval

Question 15

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.. KVM deployments require correct mapping of virtual NICs (vNICs) to specific bridge or SR-IOV interfaces, where eth0 is strictly reserved for management, eth1 for internal, and eth2 for external data traffic.

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 16

You are deploying a Cisco Secure Firewall Threat Defense in transparent mode. How are frames forwarded between the internal and external interfaces of the firewall?

Accepted Answer

By bridging frames at Layer 2 based on destination MAC addresses within a configured Bridge Group.. Transparent mode bridges traffic at Layer 2 using Bridge Groups and Bridge Virtual Interfaces (BVIs), forwarding frames based on destination MAC addresses rather than Layer 3 routing.

Answer

By encapsulating all packets inside GRE tunnels between the ingress and egress ports.

Answer

By translating all private IP addresses to public IP addresses using NAT overload.

Answer

By performing IP route lookups and decrementing the TTL on every packet.

Question 17

An engineer is deploying a Cisco Secure Firewall Threat Defense Virtual (FTDv) in Google Cloud Platform (GCP). The architecture requires multiple network interfaces. How does GCP map these interfaces during deployment?

Accepted Answer

GCP allows multiple discrete NICs per instance, with nic0 assigned to management and subsequent NICs mapped to data subnets.. GCP allows multiple Network Interface Cards (NICs) on a single compute instance, where nic0 is typically assigned for management and subsequent nic1, nic2, etc., are assigned for data traffic.

Answer

GCP requires all data traffic to pass through an external HTTP(S) load balancer before reaching nic0.

Answer

GCP supports only a single interface per VM; all VLAN subinterfaces must be trunked through nic0.

Answer

GCP virtual machines cannot be managed by Cisco FMC; they require deployment via Google Deployment Manager only.

Question 18

An administrator is configuring a secure firewall deployment in an environment where dynamic routing via OSPF is required across multiple security zones. Which configuration requirement must be met on the Cisco Secure Firewall Threat Defense?

Accepted Answer

OSPF must be enabled globally, associated with specific areas, and enabled on the specific routed interfaces belonging to security zones.. OSPF on FTD requires configuring OSPF routing processes via FMC, defining areas, enabling router IDs, and explicitly identifying the interfaces participating in OSPF routing.

Answer

OSPF neighbor adjacencies must terminate on the firewall management interface.

Answer

OSPF requires all participating interfaces to be assigned to the exact same security zone.

Answer

OSPF can only be enabled on transparent bridge virtual interfaces (BVIs).

Question 19

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 20

An engineer is configuring a Cisco Secure Firewall Threat Defense cluster in a data center. To ensure high availability and prevent split-brain scenarios, what is the specific function of the cluster control link (CCL)?

Accepted Answer

It synchronizes configuration, connection state tables, and heartbeat health checks between cluster members.. The Cluster Control Link (CCL) is dedicated to synchronization, health monitoring, and control messaging between cluster nodes, preventing split-brain conditions by maintaining quorum and state sync.

Answer

It serves as the dedicated data forwarding path for all east-west traffic between different subnets.

Answer

It offloads all Snort inspection processing from data nodes to the control node.

Answer

It connects the cluster directly to the Cisco FMC management cloud over an encrypted TLS tunnel.