Question 1

Explanation

Correct answer: C. The first reply packet for Student failed the RPF check. This issue can be resolved by adding a static route to 203.0.114.24/32 through port3.

Option C is the correct answer based on the provided information, let's analyze it:

Option C states: "The first reply packet for Student failed the RPF check. This issue can be resolved by adding a static route to 203.0.114.24/32 through port3."

The issue is related to the first reply packet from the Student failing the Reverse Path Forwarding (RPF) check and that adding a static route to 203.0.114.24/32 through "port3" will resolve the problem, then you can go ahead with this solution.

In a typical RPF check scenario, it ensures that the incoming packet is arriving on the expected interface based on the routing table. Adding a static route to 203.0.114.24/32 through "port3" may indeed resolve the RPF issue if the routing is misconfigured.

Option C is the correct solution based on your network setup and further analysis, you can proceed with implementing that static route to see if it resolves the issue. Additionally, it's a good practice to monitor the network to ensure that the problem is indeed resolved after making the change.

Extra explanation:
The first reply packet for the Student failed the Reverse Path Forwarding (RPF) check. This issue can be resolved by adding a static route to 203.0.114.24/32 through port3.

Explanation:

1. Understanding the Network Setup:

   • The Student (10.0.5.24) is connected to the FortiGate via port3 (10.0.4.254).

   • The Webserver is located at 203.0.114.24.

   • The FortiGate has two WAN interfaces:

     • wan1 (201.0.113.254)

     • wan2 (203.0.115.254)

   • The routing table shows:

     • Directly connected networks: 10.0.4.0/24 (port3), 201.0.113.0/24 (wan1), 203.0.115.0/24 (wan2).

     • There is no route for 203.0.114.24 via port3.

2. Issue - Reverse Path Forwarding (RPF) Check Failure:

   • The Student sends a request to the Webserver (203.0.114.24) via FortiGate.

   • The Webserver replies, but the reply packet's source is 203.0.114.24, which is not in the routing table through port3.

   • The FortiGate performs an RPF check to verify if the return path is valid.

   • Since there is no route for 203.0.114.24 via port3, the packet is dropped due to the RPF check.

3. Solution:

   • Add a static route to 203.0.114.24/32 via port3 so that return traffic is correctly routed back to the Student.

Thus, C is the correct answer.

• The Reverse Path Forwarding (RPF) check ensures that packets arrive from a valid source based on the routing table. If a packet fails the RPF check, it is dropped.

• In this case, the first reply packet from the Webserver to the Student fails the RPF check because the FortiGate does not have a route for 203.0.114.24/32 through port3.

• To resolve this, a static route should be added to direct traffic for 203.0.114.24/32 through port3, ensuring proper routing and allowing the Student to access the Webserver.