Fortinet NSE 7 Network Security Architect NSE7_FSN_AR-7.6 New Questions

The correct answer is A.

The study guide explains the IKEv2 exchange order very clearly:

“The initial exchanges are: IKE_SA_INIT and IKE_AUTH.”

“Create_Child_SA exchange: Creates a new child SA or rekeys an existing child SA.”

It also states:

“After successful IKE_SA_INIT and IKE_AUTH exchanges, the CHILD_SA exchange takes place. In this exchange, the peers negotiate the CHILD_SA and the traffic selectors — traffic selector responder (TSr) and traffic selector initiator (TSi).”

That is why A is correct: if the tunnel was initially brought up successfully, then the initial exchanges already succeeded. A later problem during CREATE_CHILD_SA, especially with traffic selectors/phase 2 selectors, can cause the tunnel to fail during rekey or child-SA renegotiation.

Why the other options are wrong:

B is wrong because proposal mismatch for the IKE SA is handled during IKE_SA_INIT, not after the tunnel is already up. The study guide says IKE_SA_INIT negotiates the security settings to protect the IKE traffic

C is wrong because a pre-shared key mismatch is part of authentication and would prevent successful initial establishment during IKE_AUTH. The study guide shows that after IKE_AUTH, “authentication succeeded” and “established IKE SA” when it works

D is wrong because a Diffie-Hellman mismatch belongs to IKE_SA_INIT, which happens before the tunnel comes up. The study guide also states: “By IKEv2 design, no Diffie-Hellman public key is exchanged during an IKE_AUTH exchange.”

So the verified answer is: A.

Comprehensive and Detailed 100 to 150 words of Explanation From Secure Networking Architect Study Guides topics:

FortiManager normalized interfaces are specifically designed for sharing policy packages across multiple FortiGate devices whose physical interface names or layouts may differ. The FortiManager 7.6 guide states that interfaces can be mapped per device, per platform, or by both methods. Default normalized interfaces already include per-platform mapping rules covering FortiGate models.

For a deployment using the same FortiGate model with consistent interface roles, a per-platform normalized-interface mapping is therefore the appropriate scalable design. When FortiManager installs the policy package, it translates the normalized interface into the corresponding physical interface on each target FortiGate. CLI scripts are unnecessary for normal policy interface assignment. Metadata variables provide device-specific values but are not the primary mechanism for policy interface mapping. The Install On setting controls policy installation targets; it does not perform interface-role mapping.

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