Communication & Network Security

An organization is deploying a comprehensive Network Access Control (NAC) strategy using the 802.1X standard for both wired and wireless connections. A primary security requirement is that a device must be fully authenticated at its initial point of entry to the network infrastructure. This authentication must be successfully completed *before* the device is assigned an IP address and is permitted to engage in network-level communications. To meet this requirement, at which OSI layer must the 802.1X control be enforced?

Layer 7 (Application Layer)

Layer 2 (Data Link Layer)

Layer 4 (Transport Layer)

Layer 3 (Network Layer)

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