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642-845 PDF DEMO:
QUESTION NO: 1
Which two statements are true about voice ports on a router? (Choose two.)
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.
Answer: AD
QUESTION NO: 2
Which statement is true about Foreign Exchange Station (FXS) ports on a router?
A. The FXS interface allows an analog connection to be directed at the public switched telephone network
(PSTN's) central office.
B. The FXS interface connects directly to a standard telephone, fax machine, or similar device and supplies ring, voltage, and dial tone.
C. The FXS interface connects directly to an IP phone and supplies ring, voltage, and dial tone.
D. The FXS interface connects directly to ISDN voice channels.
Answer: B
QUESTION NO: 3
Which two statements are true about the digital audio in a VoIP network? (Choose two.)
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 .
Answer: CE
QUESTION NO: 4
Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks? (Choose two.)
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.
Answer: CE
QUESTION NO: 5
Which two statements are true about the various methods of implementing QoS? (Choose two.)
A. Cisco AutoQoS can be used repeatedly to apply a single QoS policy to multiple interfaces.
B. Cisco AutoQoS includes an optional web-based GUI for automating the configuration of QoS services.
C. Cisco AutoQoS provides capabilities to automate VoIP deployments.
D. The auto qos global configuration command is used to configure Cisco AutoQoS.
E. The Modular QoS CLI (MQC) is the best way to fine tune QoS configurations.
F. The SDM QoS wizard is the fastest way to implement QoS.
Answer: CE
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Updated: May 27, 2022