多项选择题

WhichtwostatementsaretrueaboutthedigitalaudioinaVoIPnet……

Which two statements are true about the digital audio in a VoIP network？（）

A. Standard encoding techniques create an uncompressed digital data rate of 4000 bps.
B. Standard encoding techniques create an uncompressed digital data rate of 8000 bps.
C. Standard encoding techniques create an uncompressed digital data rate of 64，000 bps.
D. Voice quality is not a concern if compression is not used.
E. Two methods of quantization are linear and logarithmic.
F. Two methods of compression are u-law and a-law.

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多项选择题Whichtwostatementsaretrueaboutanalogtodigitalconversionofvoicesignalsforuseindigitaltelephonynetworks？（）

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.

多项选择题InterfacecongestioniscausingdropsinvoicepacketsandTCPpackets.ThedropsresultinjerkyspeechqualityandslowerFTPtrafficflows.WhichtwotechnologieswouldproactivelyaddresstheTCPtransferrateandthevoiceproblems？（）

A. CBWFQ
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A. EAP-FAST has the ability to tie login with non-Microsoft user databases
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多项选择题Whichthreestatementsaboutend-to-enddelayaretrue？（）

A. End-to-end delay is the sum of propagation delays， processing delays， serialization delays， and queuing delays.
B. Coast-to-coast end-to-end delay over an optical link is about 20 ms.
C. Processing delay depends on various factors， which include CPU speed， CPU utilization， IP switching mode， and router architecture.
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