多项选择题

Whichtwostatementsaretrueaboutvoiceportsonarouter？（）……

Which two statements are true about voice ports on a router？（）

A. Calls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.
B. Calls to the PSTN can be made via FXS or T1/E1 trunk ports.
C. Analog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk ports.
D. Calls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.

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多项选择题WhichtwostatementsaretrueaboutthedigitalaudioinaVoIPnetwork？（）

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.

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
B. LLQ
C. traffic shaping
D. WRED

多项选择题Whichthreemethodswouldhelppreventcriticalnetwork-trafficpacketlossonhighspeedserialinterfaces？（）

A. policy routing
B. increase link capacity
C. WRED
D. CBWFQ
E. LFI
F. WFQ

多项选择题Whatthreestatementsaretrueaboutthevariousdeploymentsofthe802.1xExtensibleAuthenticationProtocol（EAP）？（）

A. EAP-FAST has the ability to tie login with non-Microsoft user databases
B. EAP-TLS supports static passwords
C. PEAP supports one-time passwords
D. LEAP does not support multiple operating systems
E. LEAP supports Layer 3 roaming
F. PEAP does not work with WPA·