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An administrator manages a FortiGate model that supports NTurbo. How does NTurbo enhance performance for flow-based inspection?
Correct Answer:A
NTurbo enhances performance for flow-based inspection by offloading traffic to the content processor.
Refer to the exhibit.
Which route will be selected when trying to reach 10.20.30.254?
Correct Answer:A
The correct route selected when trying to reach 10.20.30.254 is 10.20.30.0/24 [10/0] via 172.20.167.254,
port3, [1/0].
Prefix Length: The routing process prioritizes routes with the most specific (longest) prefix. In this case, 10.20.30.0/24 has a shorter prefix than 10.20.30.0/26 (option C), but it still matches the target address 10.20.30.254. The /24 subnet includes all addresses from 10.20.30.0 to 10.20.30.255, so 10.20.30.254 falls within this range.
• Administrative Distance and Metric: In the exhibit, all routes have the same administrative distance (AD) and metric, meaning they are considered equal in terms of preference. Hence, the prefix length becomes the primary factor for route selection.
Why the other options are less appropriate:
B. 10.30.20.0/24 [10/0] via 172.20.121.2, port1, [1/0]
• This route is for a different subnet, 10.30.20.0/24, which does not include the target address 10.20.30.254. Therefore, it is not a valid match.
C. 10.20.30.0/26 [10/0] via 172.20.168.254, port2, [1/0]
• Although this has a more specific prefix (/26), which means it should cover a smaller range of
addresses, the /26 subnet only includes addresses from 10.20.30.0 to 10.20.30.63. The target
address 10.20.30.254 does not fall within this range, so this route will not be selected.D. 0.0.0.0/0 [10/0] via 172.20.121.2, port1, [1/0]
• This is a default route (0.0.0.0/0) used for any address that doesn??t match a more specific route.
Since 10.20.30.254 matches the 10.20.30.0/24 route (option A), the default route will not be selected.
Which two statements describe how the RPF check is used? (Choose two.)
Correct Answer:AD
The Reverse Path Forwarding (RPF) check is run on the first sent packet of any new session to ensure that the packet arrives on a legitimate interface. This check protects the network from IP spoofing attacks by verifying that a return route exists from the receiving interface back to the source IP address. If the route is invalid or not found, the packet is discarded. Options B and C are incorrect because RPF checks are performed on the first sent packet, not the reply packet.
References:
FortiOS 7.4.1 Administration Guide: Reverse Path Forwarding (RPF) Check
Which of the following methods can be used to configure FortiGate to perform source NAT (SNAT) for outgoing traffic?
Correct Answer:B
To configure source NAT (SNAT) for outgoing traffic on FortiGate, one of the most common methods
is to enable the "Use Outgoing Interface Address" option in a firewall policy. This option ensures
that the source IP address of packets leaving the FortiGate device is replaced by the IP address of the
outgoing interface. This is typically done when traffic is exiting a private network to access the internet,
requiring source NAT to translate the private IP addresses to a public IP.
Why the other options are less appropriate:
* A. Configure a static route pointing to the external interface: A static route is used to direct
traffic, but it does not configure SNAT. It determines where packets are sent but does not modify
the source IP.
• C. Create a virtual server with an external IP address: Virtual servers are used to provide
destination NAT (DNAT) for incoming traffic, not SNAT for outgoing traffic.
• D. Deploy an IPsec VPN tunnel with NAT enabled: While IPsec VPN tunnels can be configured
with NAT traversal, this is not the typical method for configuring SNAT for general outgoing
internet traffic.
Which two statements about equal-cost multi-path (ECMP) configuration on FortiGate are true? (Choose two.)
Correct Answer:AD
When SD-WAN is enabled on FortiGate, the load balancing algorithm for Equal-Cost Multi-Path (ECMP) is configured using the load-balance-mode parameter under SD-WAN settings. However, if SD-WAN is disabled, the ECMP load balancing algorithm can be configured under config system settings. This flexibility allows FortiGate to control traffic routing behavior based on the network configuration and requirements.
References:
FortiOS 7.4.1 Administration Guide: ECMP Configuration