GSLC · Question #90
Mark works as a Network Administrator for NetTech Inc. Several employees of the company work from the remote locations. The company provides a dial-up connection to employees to connect to the…
The correct answer is D. PPP. PPP (Point-to-Point Protocol) supports the callback feature via LCP extensions, allowing a remote access server to call back a dial-up client to control long-distance billing costs.
Question
Mark works as a Network Administrator for NetTech Inc. Several employees of the company work from the remote locations. The company provides a dial-up connection to employees to connect to the company's network using remote access service. Mark wants to implement call back feature for the employees who are dialing for long distance. Which of the following protocols will he use for remote access services to accomplish the task?
Options
- ASLIP
- BWEP
- CUDP
- DPPP
How the community answered
(55 responses)- A7% (4)
- B5% (3)
- C2% (1)
- D85% (47)
Why each option
PPP (Point-to-Point Protocol) supports the callback feature via LCP extensions, allowing a remote access server to call back a dial-up client to control long-distance billing costs.
SLIP (Serial Line Internet Protocol) is a legacy protocol that only encapsulates IP traffic and lacks authentication, error detection, and callback capabilities.
WEP (Wired Equivalent Privacy) is a wireless LAN encryption protocol and is entirely unrelated to dial-up remote access or callback functionality.
UDP is a connectionless transport-layer protocol and cannot establish or manage dial-up sessions or implement callback features.
PPP supports callback through its Link Control Protocol extensions defined in RFC 1570, which enables the remote access server to terminate the initial inbound call and immediately dial back the remote client - this shifts long-distance charges to the company and is a built-in feature of PPP-based remote access services.
Concept tested: PPP callback for dial-up remote access services
Source: https://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/12173-ppp-callback.html
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