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H31-311_V2.5 Exam Dumps : HCIA-Transmission V2.5

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HCIA-Transmission V2.5 Questions and Answers

Question 1

The clock unit can only access the external clock source as the timing signal source of the system through the external clock interface. In addition; It can also output a processed clock and provide a clock source for other devices that need timing.

Options:

A.

True

B.

False

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Question 2

Which of the following is the meaning of SFD in the Ethernet frame structure?

Options:

A.

Preamble

B.

Frame check sequence

C.

start frame delimiter

D.

Payload

Question 3

The1310nm and 1550nm transmission windows are low loss windows. In DWDM systems, only the 1560m transfer window is used. Which of the following is the main cause?

Options:

A.

The EDFA operating wavelength flatness region is contained in this window.

B.

The nonlinear effect of the B.1550 nm-wavelength region is small.

C.

The 1550nm wavelength region is suitable for long-distance transmission.

D.

None of the above