Free Fortinet FCSS_EFW_AD-7.6 Exam Practice Questions & Explanations
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The IT department discovered during the last network migration that all zero phase selectors in phase 2 IPsec configurations impacted network operations.
What are two valid approaches to prevent this during future migrations? (Choose two.)
Zero phase selectors in IPsec Phase 2 mean that no specific traffic selectors (subnets) are defined, allowing any traffic to be encrypted through the VPN tunnel. This can cause unintended traffic forwarding issues and disrupt network operations.
To prevent this from happening during future migrations:
Using routing protocols ensures that only specific subnets are advertised over the tunnel. Dynamic routing (such as OSPF or BGP) helps define which networks should use the tunnel, preventing unintended traffic from being encrypted.
Clearly defining phase 2 selectors avoids the problem of encrypting all traffic by explicitly stating the allowed source and destination subnets. This prevents the tunnel from affecting unrelated network traffic.
Refer to the exhibit, which contains a partial VPN configuration.
What can you conclude from this VPN IPsec phase 1 configuration?
This IPsec Phase 1 configuration defines a dynamic VPN tunnel that can accept connections from multiple peers. The settings chosen here suggest a configuration optimized for networks with intermittent traffic patterns while ensuring resources are used efficiently.
Key configurations and their impact:
set type dynamic This allows multiple peers to establish connections dynamically without needing predefined IP addresses.
set ike-version 2 Uses IKEv2, which is more efficient and supports features like EAP authentication and reduced rekeying overhead.
set dpd on-idle Dead Peer Detection (DPD) is triggered only when the tunnel is idle, reducing unnecessary keep-alive packets and improving resource utilization.
set add-route enable FortiGate automatically adds the route to the routing table when the tunnel is established, ensuring connectivity when needed.
set proposal aes128-sha256 aes256-sha256 Uses strong encryption and hashing algorithms, ensuring a secure connection.
set keylife 28800 Sets a longer key lifetime (8 hours), reducing the frequency of rekeying, which is beneficial for stable connections.
Because DPD is set to on-idle, the tunnel will not constantly send keep-alive messages but will still ensure connectivity when traffic is detected. This makes the configuration ideal for networks with regular but non-continuous traffic, balancing security and resource efficiency.
Which specialized acceleration hardware must you use for VXLAN?
What is the effect of configuring tcp-mss-sender and tcp-mss-receiver?
During the maintenance window, an administrator must sniff all the traffic going through a specific firewall policy, which is handled by NP6 interfaces. The output of the sniffer trace provides just a few packets.
Why is the output of sniffer trace limited?
FortiGate devices with NP6 (Network Processor 6) acceleration offload traffic directly to hardware, bypassing the CPU for improved performance. When auto-asic-offload is enabled in a firewall policy, most of the traffic does not reach the CPU, which means it won't be captured by the standard sniffer trace command.
Since NP6-accelerated traffic is handled entirely in hardware, only a small portion of initial packets (such as session setup packets or exceptions) might be seen in the sniffer output. To capture all packets, the administrator must disable hardware offloading using:
config firewall policy
edit
set auto-asic-offload disable
end
Disabling ASIC offload forces traffic to be processed by the CPU, allowing the sniffer tool to capture all packets.