During the STA access process, a link authentication phase is required. During this phase, which of the following security policies supports the shared key authentication mechanism?

Question

Options

• AWAPI
• BWFA3
• CWEP
• DWPA2

• A
  12% (4)
• B
  3% (1)
• C
  76% (26)
• D
  9% (3)

Explanation

WEP (Wired Equivalent Privacy) is the only protocol among these options that defines a Shared Key Authentication mechanism at the 802.11 link authentication layer, where the AP challenges the STA with a random text, and the STA encrypts it using the pre-shared WEP key - a direct challenge-response tied to a shared secret.

Why the distractors are wrong:

• A. WAPI is a Chinese national wireless security standard that uses certificate-based (digital certificate) authentication, not shared key authentication.
• B. WFA3 does not correspond to a recognized security standard; if meant as WPA3, it uses SAE (Simultaneous Authentication of Equals), which is a password-based key exchange - not the traditional shared key challenge-response at the link layer.
• D. WPA2 uses Open System Authentication at the 802.11 link layer, then authenticates via 802.1X/EAP (Enterprise) or a 4-way handshake (Personal/PSK) - never shared key authentication.

Memory tip: Think "WEP = old-school shared secret challenge" - WEP is the only 802.11 standard that literally builds shared key authentication into the link authentication frame exchange itself, which is exactly why it's cryptographically weak and was deprecated.

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