GSLC · Question #391
Which of the following is used to communicate with an authentication server commonly used in UNIX networks?
The correct answer is D. TACACS. TACACS (Terminal Access Controller Access Control System) is the AAA protocol used to communicate with centralized authentication servers, with roots in UNIX network environments.
Question
Which of the following is used to communicate with an authentication server commonly used in UNIX networks?
Options
- AMS-CHAP
- BIPX/SPX
- CSMTP
- DTACACS
How the community answered
(54 responses)- A2% (1)
- B7% (4)
- C4% (2)
- D87% (47)
Why each option
TACACS (Terminal Access Controller Access Control System) is the AAA protocol used to communicate with centralized authentication servers, with roots in UNIX network environments.
MS-CHAP (Microsoft Challenge Handshake Authentication Protocol) is a Microsoft-proprietary protocol used for PPP-based remote access authentication in Windows environments, not for UNIX authentication server communication.
IPX/SPX (Internetwork Packet Exchange/Sequenced Packet Exchange) is a network layer protocol suite developed by Novell for NetWare, not an authentication protocol.
SMTP (Simple Mail Transfer Protocol) is used for transmitting email messages between mail servers and has no role in user or device authentication.
TACACS and its successor TACACS+ are AAA (Authentication, Authorization, and Accounting) protocols specifically designed for communication between network devices and centralized authentication servers. TACACS originated in UNIX-based environments and uses TCP for reliable transport, making it the correct answer for authenticating users against a UNIX authentication server.
Concept tested: TACACS authentication protocol for UNIX network environments
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