Cisco 644-344 Dumps

Lead2Pass Additional Proctored Exams for Validating Knowledge 644-344 exam questions which contain almost 100% correct answers are tested and approved by senior Cisco lecturers and experts. They have been devoting themselves to providing candidates with the best study materials to make sure what they get are valuable. 644-344 practice tests are written to the highest standards of technical accuracy which can make you succeed in the exam.

1.Which three of the following are examples of narrow cast traffic? (Choose three.)
A. Video-orv Demand (VoD) signals
B. Voice over IP (VoIP) signals
C. High-speed data for Internet access
D. National video channels E. Radio channels
Answer: A,B,C

2.What should be emphasized when presenting the end-of-line’ signal quality calculations to customers?
A. The method of computing the cumulative contribution of all the active devices in the network, particularly the CTB and XMOD component
B. The values that have been assumed for coaxial cable attenuation
C. The power consumption of each active device
D. The insignificance of the optical network contribution
Answer: A

3.What is the target optical input level to a Cisco node?
A. -17dBm
B. 0 dBm
C. +3dBm
D. +17dBm
Answer: B

4.In engineering the upstream signal path, why is it desirable to ensure that all Cable Modems transmit at a high RF signal level?
A. Most Cable Modems perform better at higher output levels
B. The Cisco BDR (Baseband Digital Reverse) transmission system cannot operate with low RF input levels
C. A high RF level will ensure that the modem signals will have a high Carrier-to-Noise Ratio as they leave the potentially noisy subscnber’s home
D. This will speed up the modem initialization process
Answer: C

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