As shown in the figure below, the administrator has performed the configuration related to Protall authentication on the network access device. Which of the following authentication protocols does…

Question

Exhibit

Options

• ACHAP
• BHTTP/HTTPS
• CPortal
• DPAP

• A
  8% (3)
• B
  5% (2)
• C
  74% (29)
• D
  13% (5)

Explanation

Option C is correct because "Portal authentication" is named after the Portal protocol itself - it is the specific authentication mechanism used when network access devices redirect unauthenticated users to a web-based login page, where the Portal protocol governs the communication between the access device, Portal server, and authentication server.

Why the distractors are wrong:

• A (CHAP) - Challenge Handshake Authentication Protocol is used in PPP/dial-up connections, not Portal-based network access control.
• B (HTTP/HTTPS) - These are transport protocols that carry the portal web page to the user's browser, but they are not the authentication protocol itself.
• D (PAP) - Password Authentication Protocol is also a PPP protocol that sends credentials in plaintext; it is not used in Portal authentication flows.

Memory tip: The question contains the answer - "Portal authentication" uses the Portal protocol. When you see "Portal authentication," think of it as a self-describing term: the protocol and the method share the same name, just like "RADIUS authentication" uses RADIUS.

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