A network administrator is troubleshooting an issue where users in the finance VLAN are unable to access a critical server in the server VLAN. The switch logs show multiple 'Authentication failed' messages for MAC addresses in the finance VLAN. The switchport security feature is enabled on the access ports. What is the most likely cause of the issue?
Trap 1: The switch ports are configured as trunks and are not allowing the…
Trunk configuration would affect all VLANs, not just specific MAC addresses.
Trap 2: 802.1X authentication is failing for the finance users.
802.1X would show authentication failures, but the logs mention 'switchport security', not 802.1X.
Trap 3: Spanning Tree Protocol (STP) is blocking the ports in the finance…
STP blocking would affect the entire VLAN, not individual MAC addresses.
- A
The switch ports are configured as trunks and are not allowing the finance VLAN.
Why wrong: Trunk configuration would affect all VLANs, not just specific MAC addresses.
- B
802.1X authentication is failing for the finance users.
Why wrong: 802.1X would show authentication failures, but the logs mention 'switchport security', not 802.1X.
- C
Spanning Tree Protocol (STP) is blocking the ports in the finance VLAN.
Why wrong: STP blocking would affect the entire VLAN, not individual MAC addresses.
- D
Switchport security violation has caused the ports to error-disable or drop traffic.
Switchport security violation can disable the port or drop traffic from unauthorized MAC addresses.