To enhance user access security, a company deployed MAC priority Portal authentication. As shown in the figure, please pair the following authentication steps in order.

Question

Options

• A1 matches Executing Portal authentication, successful result; 2 matches Redirect the user's HTTP request to the Portal authentication page; 3 matches User browsing web pages, terminal sending HTTP traffic; 4 matches Performing MAC authentication, the radius server cached the record of the MAC address, and the authentication was successful; 5 matches User disconnected; 6 matches Performing MAC authentication, result failed; 7 matches Users do not need to reauthenticate; 8 matches During the validity period of the MAC address, the user continues to access the internet
• B
• C
• D

• A
  72% (28)
• B
  8% (3)
• C
  5% (2)
• D
  15% (6)

Explanation

Option A correctly sequences the MAC priority Portal authentication flow in logical order: the user first sends HTTP traffic → MAC authentication fails (no prior record) → the HTTP request is redirected to the Portal page → Portal authentication succeeds → the user later disconnects → on reconnection, MAC authentication succeeds because the RADIUS server now has the MAC address cached from the previous Portal session → no reauthentication is required → the user continues access within the validity window. This sequence accurately reflects the "MAC priority" design: MAC auth is always attempted first, and Portal auth only triggers on failure, with the successful Portal login populating the MAC cache for future frictionless access.

The distractors (B, C, D) were not provided with content in this question, which suggests they presented the same steps in incorrect orders - common traps include placing the Portal redirect before the MAC auth attempt, or omitting the disconnect/reconnect cycle that demonstrates why MAC caching matters.

Memory tip: Think of it as a two-pass story - Pass 1: MAC fails → Portal saves you; Pass 2: MAC succeeds → Portal is bypassed. The MAC cache is the bridge between the two passes, which is the whole point of "MAC priority" Portal authentication.

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