Fortinet Network Security Expert 4 Written Exam (400) : NSE4 Exam

  • Exam Code: NSE4
  • Exam Name: Fortinet Network Security Expert 4 Written Exam (400)
  • Updated: Jun 06, 2026
  • Q & A: 303 Questions and Answers

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Fortinet Network Security Expert 4 Written Exam (400) Sample Questions:

1. Review the IKE debug output for IPsec shown in the exhibit below.

Which statements is correct regarding this output?

A) The output captures the dead gateway detection packets.
B) The output is a phase 1 negotiation.
C) The output captures the dead peer detection messages.
D) The output is a phase 2 negotiation.


2. Which statement best describes the objective of the SYN proxy feature available in SP processors?

A) Analyze the SYN packet to decide if the new session can be offloaded to the SP processor
B) Collect statistics regarding traffic sessions
C) Accelerate the TCP 3-way handshake
D) Protect against SYN flood attacks.


3. When firewall policy authentication is enabled, which protocols can trigger an authentication challenge? (Choose two.)

A) SMTP
B) SCP
C) HTTP
D) SSH
E) FTP


4. Which antivirus and attack definition update options are supported by FortiGate units?
(Choose two.)

A) Pull updates from the FortiGate device
B) Push updates from the FortiGuard Distribution Network.
C) execute fortiguard-AV-AS command from the CLI.
D) Manual update by downloading the signatures from the support site.


5. Which statement best describes what SSL.root is?

A) The virtual interface in the root VDOM that the remote SSL VPN tunnels connect to.
B) The name of a virtual interface in the root VDOM where all the SSL VPN user traffic comes from.
C) The name of the virtual network adapter required in each user's PC for SSL VPN Tunnel mode.
D) A Firewall Address object that contains the IP addresses assigned to SSL VPN users.


Solutions:

Question # 1
Answer: C
Question # 2
Answer: D
Question # 3
Answer: C,E
Question # 4
Answer: A,B,D
Question # 5
Answer: B

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