A site-to-site IPsec VPN is not establishing. The administrator runs `diagnose vpn ike log` and sees that the IKE packets are being sent but no response is received. What is the most likely cause?

The Phase 1 DH group is too high

The pre-shared key is incorrect

The remote gateway is not reachable or is blocking UDP port 500

The Phase 2 encryption algorithms do not match

A site-to-site IPsec VPN is not establishing. The administrator runs `diagnose vpn ike log` and sees the message 'no proposal chosen'. Both sides have the same Phase 1 encryption and DH group. What is the most likely cause?

The remote gateway IP address is wrong

The pre-shared key is incorrect

The Phase 2 encryption algorithms do not match

The Phase 1 lifetime is too short

What is the primary purpose of Diffie-Hellman key exchange in IPsec?

To authenticate the identities of the VPN peers

To compress the data for efficient transmission

To encrypt the IPsec data traffic

To securely establish a shared secret key over an insecure channel

What is the primary purpose of an IPsec VPN in FortiOS?

To replace the need for a firewall by blocking all inbound traffic

To provide a dedicated physical link between two sites

To encrypt and authenticate IP packets between two endpoints over an untrusted network

To compress data to reduce bandwidth usage

What is a key characteristic of IPsec tunnel mode?

It only encrypts the payload, leaving the original IP header unchanged

It encapsulates the entire original IP packet with a new IP header

It is used only for host-to-host communication

It does not provide authentication of the IP packets

FortinetNSE 4 - FortiOS 7.6 Administrator

Domain 5Objective 1

IPsec VPN Concepts NSE4-FORTIOS-ADMINISTRATOR Practice Questions (Page 6)

Part of the VPNs domain, which accounts for 10-15% of the NSE4-FORTIOS-ADMINISTRATOR exam. Fortinet does not publish an official question count, but from its 90-minute exam (~35–60 total, ~4–9 in this domain), expect 1–2 from this objective — we provide 33 practice questions to prepare you well beyond it. (estimate)

33questions here

7free pages

9concepts

10-15%of the exam

Questions 26–30

26application · medium
A site-to-site IPsec VPN is not establishing. The administrator runs `diagnose vpn ike log` and sees that the IKE packets are being sent but no response is received. What is the most likely cause?
Select an answer first
27expert · hard
A site-to-site IPsec VPN is not establishing. The administrator runs `diagnose vpn ike log` and sees the message 'no proposal chosen'. Both sides have the same Phase 1 encryption and DH group. What is the most likely cause?
Select an answer first
28foundation · easy
What is the primary purpose of Diffie-Hellman key exchange in IPsec?
Select an answer first
29foundation · easy
What is the primary purpose of an IPsec VPN in FortiOS?
Select an answer first
30foundation · easy
What is a key characteristic of IPsec tunnel mode?
Select an answer first

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