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Your Layer 2 network uses 802.1X to authenticate user devices connecting to the network. You are asked to include a new Layer 2 interface connection from the conference room in your network. You must ensure that only a single device is allowed to authenticate on this port at one time to avoid users from being able to plug in a rogue switch to this port. In this scenario, which 802.1X method would you use for the new interface?
Correct Answer: A
This question focuses on port security and preventing "rogue switches" or multiple devices from accessing a single physical port simultaneously. * Single-Secure Supplicant Mode (Option A): This is the most restrictive 802.1X mode in Junos OS. It allows exactly one MAC address to be authenticated on the port at a time. If a device successfully authenticates, the switch will drop any traffic coming from any other MAC address on that same physical interface. If a user tries to plug in a switch, only the first device that authenticates will have access; all other devices behind that switch will be blocked. * Single Supplicant Mode (Option C): This mode allows the first authenticated user to "open" the port for all other users. This would actually allow a rogue switch to function once the first device is authorized. * Multiple Supplicant Mode (Option B): This allows multiple devices to connect, provided each one authenticates individually. While secure, it does not prevent a user from connecting multiple devices to the port, which violates the requirement to allow only one. * MAC-RADIUS (Option D): This is an authentication method, not a port-access mode that limits the number of supplicants.
