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Question 5 - NSE7_LED-7.0 discussion

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An administrator is testing the connectivity for a new VLAN The devices in the VLAN are connected to a FortiSwitch device that is managed by FortiGate Quarantine is disabled on FortiGate

While testing the administrator noticed that devices can ping FortiGate and FortiGate can ping the devices The administrator also noticed that inter-VLAN communication works However intra-VLAN communication does not work

Which scenario is likely to cause this issue?

A.
Access VLAN is enabled on the VLAN
Answers
A.
Access VLAN is enabled on the VLAN
B.
The native VLAN configured on the ports is incorrect
Answers
B.
The native VLAN configured on the ports is incorrect
C.
The FortiSwitch MAC address table is missing entries
Answers
C.
The FortiSwitch MAC address table is missing entries
D.
The FortiGate ARP table is missing entries
Answers
D.
The FortiGate ARP table is missing entries
Suggested answer: C

Explanation:

According to the scenario, the devices in the VLAN are connected to a FortiSwitch device that is managed by FortiGate. Quarantine is disabled on FortiGate, which means that the devices are not blocked by any security policy. The devices can ping FortiGate and FortiGate can ping the devices, which means that the IP connectivity is working. Inter-VLAN communication works, which means that the routing between VLANs is working. However, intra-VLAN communication does not work, which means that the switching within the VLAN is not working. Therefore, option C is true because the FortiSwitch MAC address table is missing entries, which means that the FortiSwitch does not know how to forward frames to the destination MAC addresses within the VLAN. Option A is false because access VLAN is enabled on the VLAN, which means that the VLAN ID is added to the frames on ingress and removed on egress. This does not affect intra-VLAN communication. Option B is false because the native VLAN configured on the ports is incorrect, which means that the frames on the native VLAN are not tagged with a VLAN ID. This does not affect intra-VLAN communication. Option D is false because the FortiGate ARP table is missing entries, which means that FortiGate does not know how to map IP addresses to MAC addresses. This does not affect intra-VLAN communication.

asked 18/09/2024
Leandra Felipe
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