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Fortinet NSE4_FGT_AD-7.6 Practice Test 17

Question 160

Site-to-site traffic 10.1.0.0/24→10.2.0.0/24 is permitted via an IPsec interface, but its central SNAT rule translates 10.1.0.0/24 to a public WAN address, violating selectors and peer expectations. What is required?

  1. Enlarge the public internet IP pool to cover more addresses.
  2. Change the FortiGate administrator trusted-host list.
  3. Replace the site VPN phase 1 name without correcting NAT scope.
  4. Scope or exempt the protected VPN destinations from that internet SNAT mapping so tunnel traffic retains the intended private source.

Explanation

Correct Answer

D:

The peer expects the protected private subnet; an overly broad source-translation map changes source addresses after policy selection and can defeat encrypted traffic matching.

Incorrect Answers

A:

More WAN source addresses intensify the wrong-NAT issue for VPN traffic.

B:

Management access is unrelated to translation of protected transit subnets.

C:

Tunnel naming does not stop the central SNAT map from rewriting the source.

Question 161

FortiOS packet capture on wan1 shows forwarded SYN packets with source 10.12.0.20, although the ISP expects a public source address. The policy matched and routing succeeded. Which boundary was missed?

  1. An inbound VIP translated the server's destination incorrectly.
  2. The FortiGate management HTTPS port is disabled.
  3. The matching source-NAT setting or central SNAT mapping did not translate the client's private source.
  4. The FortiAnalyzer traffic log disk reached capacity.

Explanation

Correct Answer

C:

Forward policy acceptance and WAN routing do not themselves guarantee SNAT; the observed packet source proves translation did not occur.

Incorrect Answers

A:

An inbound DNAT VIP is not required for ordinary private clients using Internet SNAT.

B:

A local administrator listener has no role in forwarded source-address translation.

D:

Log retention does not account for private addresses visible in actual WAN egress packets.

Question 162

An inbound FortiGate VIP maps 203.0.113.50:8443 to 10.10.0.50:80, but the server only listens on 443. External SYNs match the VIP and no backend TCP handshake completes. Which field is wrong?

  1. The outbound Internet SNAT pool must be larger.
  2. The VIP mapped internal port must match TCP 443, not the backend's unused TCP 80.
  3. The administrator HTTPS certificate must be reissued.
  4. The external port should be changed to TCP 22.

Explanation

Correct Answer

B:

Destination NAT maps external socket coordinates to an internal socket; matching an unused server port produces a reachable public VIP with no backend service.

Incorrect Answers

A:

Outbound client source translation does not fix the specific mapped destination port.

C:

The published service is on an internal server, not the FortiGate GUI.

D:

The client-facing requirement is HTTPS on TCP 8443, not SSH.

Question 163

A public VIP exists and points to the correct server, but no inbound accept policy in non-central-NAT mode selects that VIP as destination. Traces show the connection is denied. Which policy gap explains it?

  1. The server uses a private RFC1918 address.
  2. The publishing rule lacks the VIP destination object/eligible match needed to authorize the DNAT flow.
  3. The FortiGuard web category has been changed.
  4. The local administrator password is expired.

Explanation

Correct Answer

B:

A configured DNAT object is not an automatic permit; non-central-NAT policies must match/allow the published destination.

Incorrect Answers

A:

Mapping public addresses to private servers is the intended VIP use case, not itself the fault.

C:

A missing forwarding permit occurs before category filtering.

D:

Login to the FortiGate GUI is unrelated to an inbound application VIP policy.

Question 164

A FortiGate was converted to central NAT mode. The old security rule no longer offers the VIP as a destination selection, but the DNAT/VIP object remains configured and enabled in the central NAT section. Why did the UI match behavior change?

  1. FortiOS automatically deletes all security policies when central NAT is enabled.
  2. SNMP monitoring disables destination NAT objects.
  3. Central NAT processes enabled VIP/DNAT objects separately from the security policy destination field.
  4. FGCP HA automatically takes ownership of every external VIP.

Explanation

Correct Answer

C:

The change is an operating-mode design; the administrator must validate the standalone DNAT object and a separate forwarding permit.

Incorrect Answers

A:

NAT separation does not remove the requirement for policy authorization.

B:

The observer describes a normal GUI/mode change, unrelated to SNMP.

D:

HA role selection cannot explain this central-NAT configuration difference.

Question 165

A FortiGate SNAT policy allows 10.5.0.0/24, but its configured pool includes 198.51.100.60–.65 while the provider assigned 203.0.113.40–.45. The session table reports translated source 198.51.100.62. What is the direct problem?

  1. The client has no private subnet route.
  2. The destination VIP is missing an inbound object.
  3. The IPS profile uses Monitor mode.
  4. The selected IP pool contains external source addresses not authorized for the current ISP path.

Explanation

Correct Answer

D:

The translated source matches the bad pool, confirming that the NAT configuration—not the policy permit—selects the wrong public identity.

Incorrect Answers

A:

The session reached SNAT and left; internal source routing was sufficient for that result.

B:

Ordinary internet SNAT does not depend on a published server VIP.

C:

IPS actions do not select a SNAT address from a configured IP pool.

Question 166

Users on the LAN can open an internal server by its private IP but not by its public DNS VIP. WAN clients can use that public VIP. The VIP external interface is restricted to wan1 and LAN-originated packets enter port2. Which path issue is likely?

  1. The server's application daemon is down.
  2. FortiGate's administrator trusted hosts block the LAN user.
  3. The existing VIP/policy is not eligible for LAN-originated hairpin traffic on port2; the U-turn NAT/policy path must be designed.
  4. The external IP address is missing from all public DNS servers.

Explanation

Correct Answer

C:

A WAN-bound external VIP does not automatically match same-LAN ingress; a supported hairpin path must permit and translate the internal source flow.

Incorrect Answers

A:

Private-IP connections to the same server work, so the service is running.

B:

Trusted hosts protect the firewall GUI, not the published internal web server.

D:

Clients already resolve and attempt the public VIP; the issue is NAT path eligibility.

Question 167

The public service requirement is TCP 8443→private TCP 443. The FortiGate VIP is configured with extport=443 and mappedport=443. A packet capture shows users send SYN to 8443 and there is no VIP hit. What caused the miss?

  1. The mapped internal port 443 is incorrect because all HTTPS uses 8443 internally.
  2. The client IP subnet mask should include more RFC1918 addresses.
  3. The VIP external port is 443 instead of the client-requested 8443; the DNAT mapping does not match incoming 8443.
  4. The FortiAnalyzer cloud report is not configured.

Explanation

Correct Answer

C:

The external port matcher determines whether the VIP applies before the packet can be translated to the internal listening port.

Incorrect Answers

A:

The private server is explicitly listening on 443, so that mapped port is correct.

B:

Incoming public destination service-port mismatch is unrelated to client private subnet size.

D:

Log reporting does not create a VIP port-forwarding match.

Question 168

Public HTTPS on 198.51.100.10 works when packets enter WAN1. Identical traffic entering WAN2 never matches the corresponding VIP whose extintf is wan1. What explains the ingress difference?

  1. The internal server process is stopped.
  2. The outbound central SNAT table has no entries.
  3. The VIP's external-interface constraint excludes WAN2, so an authorized WAN2 publication needs its own eligible VIP/policy scope.
  4. The FortiGate administrator is using an expired password.

Explanation

Correct Answer

C:

FortiOS includes VIP extintf in applicability; working WAN1 does not imply WAN2 matches that object.

Incorrect Answers

A:

The service succeeds from WAN1, demonstrating the backend can respond.

B:

The failure is an inbound DNAT VIP interface match, not private client egress SNAT.

D:

The administrator GUI credential does not determine the VIP ingress interface.

Question 169

FortiGate sends accepted TCP SYNs with translated source 198.51.100.80, but the ISP confirms it advertises only 203.0.113.0/28 to the customer and drops other customer source addresses. Why is no return traffic seen?

  1. The source-DHCP lease expires too quickly on the LAN.
  2. The configured SNAT identity is outside the provider-routed/accepted public prefix.
  3. The HTTPS server's CA chain is incomplete.
  4. The FortiGate CPU is in conserve mode.

Explanation

Correct Answer

B:

Translation applied, but the ISP cannot route or permit replies for the chosen external source; pool ownership and routing are required beyond FortiOS syntax.

Incorrect Answers

A:

WAN packets already carry translated public sources; this does not explain provider-side rejection.

C:

The failure happens before TCP response, not during TLS certificate validation.

D:

The reported ISP source-prefix filtering directly explains the packet loss without a resource hypothesis.

Question 170

Traffic for a route-based IPsec peer 10.2.0.0/24 leaves with source 203.0.113.5, even though Phase 2 selectors expect source 10.1.0.0/24. The central SNAT map uses destination `all`. What is the configuration error?

  1. The IKE pre-shared key is incorrect.
  2. The SNMP remote logging host changed.
  3. The web-filter category is undefined.
  4. The central source-NAT rule includes private VPN destinations and rewrites the protected source subnet.

Explanation

Correct Answer

D:

SNAT applies to the matched flow after security policy; a destination ALL match can translate VPN-bound traffic not intended for internet NAT.

Incorrect Answers

A:

Negotiation is already established; the packet source changes at SNAT.

B:

Management telemetry cannot explain translated packet source on the VPN flow.

C:

URL categorization is unrelated to the protected IPsec source selector mismatch.


Fortinet NSE 4 - FortiOS 7.6 Administrator (NSE4_FGT_AD-7.6) Practice Tests
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