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Fortinet Discussions

Exam NSE7_OTS-6.4 topic 1 question 17 discussion

Actual exam question from Fortinet's NSE7_OTS-6.4
Question #: 17
Topic #: 1
[All NSE7_OTS-6.4 Questions]

An OT architect has deployed a Layer 2 switch in the OT network at Level 1 the Purdue model-process control. The purpose of the Layer 2 switch is to segment traffic between PLC1 and PLC2 with two VLANs. All the traffic between PLC1 and PLC2 must first flow through the Layer 2 switch and then through the FortiGate device in the Level 2 supervisory control network.
What statement about the traffic between PLC1 and PLC2 is true?

  • A. The Layer 2 switch rewrites VLAN tags before sending traffic to the FortiGate device.
  • B. The Layer 2 switches routes any traffic to the FortiGate device through an Ethernet link.
  • C. PLC1 and PLC2 traffic must flow through the Layer-2 switch trunk link to the FortiGate device.
  • D. In order to communicate, PLC1 must be in the same VLAN as PLC2.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by Spippolo at Feb. 26, 2023, 4:34 p.m.

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azjlmpang
6 months, 1 week ago
Selected Answer: C
PLC1 and PLC2 is on separate VLANs and needs to have a Router (FG) for inter-vlan routing. Traffic should flow thru a trunk link between switch and FG
upvoted 1 times
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MashhoodAhmad
9 months ago
Selected Answer: C
Page 120 – Study Guide | NSE7 OT 6.4
upvoted 1 times
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ali_red
12 months ago
C for sure
upvoted 1 times
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alaweis
1 year, 1 month ago
Selected Answer: C
Need to understand networking to answer this one. In order for a VLANx to comunicate with VLANY it needs a L3 device, which in this case is the Fortigate, for this to take place it needs a trunk link between Switch and Fortigate.
upvoted 2 times
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Spippolo
1 year, 1 month ago
Selected Answer: C
Router on a stick is used within an OT network to achieve inter-VLAN routing. You will need to configure the router interface to operate as an 802.1q trunk link that is connected to a switch interface that is configured in trunk mode as well. The router receives VLAN tagged traffic from the switch. The router then removes the tag and adds another VLAN tag based on the destination address.
upvoted 3 times
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