单选题Which statement is true about the digital to analog conversion process？（）A the two steps of digital to analog conversion are decompression and reconstruction of the analog signalB the two steps of digital to analog conversion are decoding and filtering

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单选题

Which statement is true about the digital to analog conversion process？（）

the two steps of digital to analog conversion are decompression and reconstruction of the analog signal

the two steps of digital to analog conversion are decoding and filtering

the two steps of digital to analog conversion are decompression and filtering of the analog signal

the two steps of digital to analog conversion are quantization and decoding

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第1题：

When comparing analog display inputs to digital display inputs, which of the following is anadvantage that digital has over analog?()

A. Allows for higher brightness

B. More crosstalk

C. Sustains higher resolutions

D. Supports widescreen resolutions

参考答案：C

第2题：

Which statement is true about IBGP routers? ()

A. They must be fully meshed

B. They can be in a different AS

C . They do not need to be directly connected

D. They must be directly connected

参考答案：C

第3题：

Theprocessquantizingthecontinuousvaluesintoabinaryscaleiscalled().

A.digital-to-analogconversion

B.digital-to-digitalconversion

C.analog-to-digitalconversion

D.analog-to-analogconversion

参考答案：C

第4题：

Which three statements are true about terms in a policy?（）

A、The order of the terms in a policy is irrelevant.
B、The action is specified in a then statement.
C、Terms are optional in a policy.
D、The match condition can be identified with a from statement.
E、A from statement is mandatory in a term.

正确答案:B,C,D

第5题：

Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？（）

A、The three required steps in the analog to digital conversion are sampling，encoding，and compression.
B、The three required steps in the analog to digital conversion are sampling，quantization，and compression.
C、The three required steps in the analog to digital conversion are sampling，quantization，and encoding.
D、The output of the sampling process is a pulse code modulation （PCM） signal.
E、The output of the sampling process is a pulse amplitude modulation （PAM） signal.

正确答案:C,E

第6题：

is a device which enables digital microcomputers to communicate across analog telephone lines.

A．The switch

B．The modem

C．The hub

D．The repeater

正确答案：B

第7题：

Which of the following describes the roles of devices in a WAN? ()

A.A CSU/DSU terminates a digital local loop

B.A modem terminates a digital local loop

C.A CSU/DSU terminates an analog local loop

D.A modem terminates an analog local loop

E.A router is commonly considered a DTE device

F.A router is commonly considered a DCE device

参考答案：A, D, E

第8题：

Which statement is true about the frequency of OSPF LSA transmissions?()

A.A

B.B

C.C

D.D

参考答案：D

第9题：

Which of the following describes the roles of devices in a WAN?（）

A、A CSU/DSU terminates a digital local loop
B、A modem terminates a digital local loop
C、A CSU/DSU terminates an analog local loop
D、A modem terminates an analog local loop
E、A router is commonly consideredaDTEdevice
F、A router is commonly considereda DCE device

正确答案:A,D,E

第10题：

Which statement is true about IBGP routers? （）

A、They must be fully meshed
B、They can be in a different AS
C、They must be directly connected

正确答案:C

Which statement is true about the digital to analog conversi

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