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Cisco CCNA/CCENT Exam 640-802, 640-822, 640-816 Preparation Kit by Dale Liu

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1. In a typical WAN environment, your router loses connection to the service provider on Frame Relay link. Which of the following would most likely be the cause of the loss of connection?
A. DCE lost clock rate
B. DTE lost clock rate
C. ISDN lost clock rate
D. PPP lost clock rate
Correct Answer & Explanation:A. Answer A is correct; the DCE (remember C for Clock and C for DCE) controls the clock signal for synchronization of the WAN Link.
Incorrect Answers & Explanations:B, C, and D. Answer B is incorrect as the DTE side receives the signal from the DCE. Answer C is incorrect as ISDN is a completely different carrier than Frame Relay and does not use the clocking signal. Answer D is incorrect as it is an encapsulation format that Frame Relay could be ...

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