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← Fortinet NSE 4 - FortiOS 7.6 Administrator
NSE 4 · SD-WAN

Practice question 361 of 440 · easy

Which two statements correctly describe underlay and overlay? Select two answers.

Select all that apply. Every correct option and no extras are required for credit in the app.

  1. A.An underlay eliminates the need for peer reachability.
  2. B.Broadband can provide an underlay transport.
  3. C.IPsec tunnels can provide an encrypted overlay.
  4. D.Every SD-WAN physical member is encrypted automatically.
  5. E.Overlay means only the FortiGate GUI dashboard.
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✓ Correct answers

  • Broadband can provide an underlay transport.
  • IPsec tunnels can provide an encrypted overlay.

The underlay transports traffic; an IPsec overlay adds tunnel connectivity/encryption over it. Membership alone does not encrypt traffic, overlay is a network construct, and the tunnel still depends on underlay reachability.

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Unofficial study material, independently created and unaffiliated with Fortinet. Questions are original practice items, not recalled exam content. Published-topic coverage does not guarantee examination success. FortiOS baseline is 7.6.0; independently versioned FortiSASE and CNF references are qualified where relevant.