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Fortinet NSE4_FGT_AD-7.6 Practice Test 18

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.

Question 171

After enabling profile-based policy SNAT for 10.12.0.0/24 through wan1, which result is proof that Internet clients are using the approved public egress identity?

  1. The client has a private DHCP address.
  2. A new test session from 10.12.0.20 appears on wan1 with the intended public source address and receives a valid reply.
  3. A VIP points an external server IP to a private backend.
  4. The WAN management GUI loads from an administrator workstation.

Explanation

Correct Answer

B:

The on-wire translated source plus a returning connection proves the SNAT rule matches and upstream routing works.

Incorrect Answers

A:

A private source lease does not prove the firewall rewrites it before WAN egress.

C:

DNAT for an inbound server is not evidence of outbound client SNAT.

D:

Local-in management access does not expose the source IP on forwarded sessions.

Question 172

A VIP was created to publish 203.0.113.50:8443 to 10.10.0.50:443. Which observation proves that the destination port translation works as intended?

  1. The browser only resolves the public DNS name.
  2. The server listens on TCP 443 but no client connection is attempted.
  3. The FortiGate public HTTPS administrator service is enabled.
  4. A client sends to TCP 8443 externally, while the internal capture shows a matching connection delivered to server 10.10.0.50 TCP 443.

Explanation

Correct Answer

D:

The original and translated socket tuple directly establishes the configured destination-port mapping, instead of inferring it from a VIP object name.

Incorrect Answers

A:

Name lookup does not establish that traffic reached the mapped internal port.

B:

A listening process is necessary but not proof of DNAT and policy matching.

C:

That listener belongs to the firewall management plane, not the internal web server mapping.

Question 173

A new inbound VIP is configured for a published server on a FortiGate where central NAT is disabled. Select TWO tests that together establish destination translation and separate policy authorization.

  1. Verify a real external packet hits the intended VIP and is translated to the private backend address/port.
  2. Verify that the same test session matches the expected incoming/outgoing interfaces, service and accepting firewall policy.
  3. Check that an outbound LAN user receives a DHCP lease.
  4. Enable admin HTTPS on the FortiGate WAN interface and assume that is a server permit.
  5. Check only that the VIP object name is present in the address-book list.

Explanation

Correct Answer

A:

The NAT observation proves the public-to-private destination mapping was selected.

B:

A correctly configured VIP is not sufficient unless the forwarding security policy actually permits the mapped service.

Incorrect Answers

C:

DHCP assignment does not demonstrate publication of this private server.

D:

Local management HTTPS is not a forwarding rule for the VIP.

E:

Object existence alone proves neither actual DNAT selection nor permission to forward.

Question 174

A FortiOS 7.6.0 device uses central NAT. Which controlled evidence validates publication of one internal server without expecting the VIP inside the forwarding policy destination?

  1. Only the administrator sees a Central SNAT menu.
  2. Only outbound client sessions use a public source pool.
  3. A new inbound session matches the enabled central DNAT/VIP object, reaches the mapped backend and passes the intended separate accept policy.
  4. A local-in policy allows HTTPS to the FortiGate management IP.

Explanation

Correct Answer

C:

Central mode separates translation from security-policy authorization; both DNAT tuple and forward rule action must be observed.

Incorrect Answers

A:

The menu exists in the mode but does not show a DNAT hit or server response.

B:

SNAT of Internet-bound users does not prove the specific inbound VIP maps to the backend.

D:

A management listener does not publish a private application server through DNAT.

Question 175

An IP pool was changed from 198.51.100.60–.65 to the ISP-assigned 203.0.113.40–.45. Which test shows the offending source identity is gone?

  1. Start a new flow, confirm its translated source is within 203.0.113.40–.45, and observe the expected reply route.
  2. Look only at the policy name that references the pool.
  3. Confirm the private server VIP still exists.
  4. Verify the FortiGate clocks match the FortiAnalyzer server.

Explanation

Correct Answer

A:

Checking the NAT entry and return traffic proves the firewall selected the right pool and the provider can reach its translated source.

Incorrect Answers

B:

Names do not show which address a real session received.

C:

An inbound destination map is unrelated to the outgoing source pool.

D:

Log timestamp agreement cannot prove public source translation and reply routing.

Question 176

An internal DNS name resolves to a server's published public VIP. A hairpin policy was added so LAN users can use that public name. Which acceptance result tests the whole path?

  1. Test only an internet user accessing the public VIP.
  2. Ping the internal server's private IP directly.
  3. Increase the DNS TTL for the public hostname.
  4. From a same-LAN client, connect to the public VIP and confirm the server receives the intended translated flow and returns through the FortiGate.

Explanation

Correct Answer

D:

A working hairpin must both match the VIP internally and preserve a reply path through the firewall; external WAN success alone does not show this.

Incorrect Answers

A:

WAN DNAT can work while LAN-to-VIP U-turn matching remains broken.

B:

Direct access bypasses the public-address hairpin translation path.

C:

Caching name resolution does not validate the NAT and symmetric routing needed for hairpin.

Question 177

A FortiGate port-forward VIP has `extport=8443` and `mappedport=443`. Which verification demonstrates the intended service is reachable but unrelated port 443 on the public address is not accidentally published?

  1. Initiate new external TCP 8443 and 443 connections; confirm 8443 maps to the internal HTTPS service while unapproved external 443 has no permitted VIP match.
  2. Check only that the backend application listens on 443.
  3. Compare private client DHCP leases before and after the change.
  4. Inspect the administrator login page certificate on the FortiGate.

Explanation

Correct Answer

A:

Testing the two external ports proves the translation is on the specified port rather than an overly broad external HTTPS listener.

Incorrect Answers

B:

The internal listener does not establish which public service port maps to it.

C:

Address leases do not determine a VIP external-port match.

D:

A local management listener is unrelated to the application VIP port restriction.

Question 178

A new FortiGate VIP and policy have been added for an application on ISP2/WAN2. What result demonstrates users on the second provider path now hit the intended object?

  1. Only retest the previously working WAN1 public address.
  2. Create a fresh external connection to the WAN2 public address and observe WAN2 ingress, the matching VIP DNAT result and the inbound allow policy.
  3. Verify remote logging is enabled on port2.
  4. Count public DNS queries for the application hostname.

Explanation

Correct Answer

B:

Ingress-interface and translated destination evidence show the WAN2 publication operates independently of the existing WAN1 VIP.

Incorrect Answers

A:

WAN1 success does not prove any VIP or policy covers WAN2.

C:

Syslog destination status cannot establish inbound destination translation.

D:

DNS lookup volume does not prove the WAN2 VIP or firewall-policy match.

Question 179

A central SNAT mapping now uses only provider-assigned 203.0.113.0/28 addresses instead of an unrouted 198.51.100.x pool. What combined observation proves the original return-path failure is gone?

  1. Check only that the central SNAT rule is enabled.
  2. Capture a new outgoing flow with an assigned translated source and the corresponding inbound response routed back through that address.
  3. Verify the FortiGate local-in policy allows ping.
  4. Confirm a user can sign in through FSSO.

Explanation

Correct Answer

B:

A valid outbound source plus its return response confirms both FortiGate SNAT selection and actual upstream routing.

Incorrect Answers

A:

A configured rule may select an invalid pool or not match the tested flow.

C:

Management-plane ICMP does not establish return routing for translated client sessions.

D:

Identity authentication does not show which translated source reached the ISP or whether a reply returned.

Question 180

An overbroad central SNAT rule was modified to exclude a site-to-site IPsec destination. Which packet-level proof is needed before closing the ticket?

  1. The Internet browsing clients still use public NAT from WAN1.
  2. The tunnel appears Up but no traffic is generated.
  3. A new protected LAN flow enters the IPsec interface with the expected 10.1.0.0/24 source, matches the intended Phase 2 selectors and reaches the peer.
  4. An administrator can ping the FortiGate's management interface.

Explanation

Correct Answer

C:

The actual source address must remain within the protected subnet for selectors and peer policies; an established IKE SA alone is insufficient.

Incorrect Answers

A:

Working Internet SNAT is not evidence that VPN traffic was exempted from that mapping.

B:

An established SA does not prove the packet source was not translated.

D:

Local device management access is not traffic across the VPN.


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