Saturday, December 20, 2008

Killtest NCTE 920-804 Exam Q&A (5)

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7. A customer is planning a new VoIP network based on their existing PBX and corporate network. They need historical information about calling patterns in order to plan for VoIP traffic. What is the best source of this type historical information?
A. Operational Measurements from switch
B. Error messages from all networking devices
C. Alarm indications from all networking devices
D. Log reports from switch and all networking devices
Answer: A

8. Given the following network information: ?A company with a mixed VoIP and data network is experiencing bad voice quality with VoIP calls during normal business hours. ?Tests within their LAN segments warn of excessive jitter, delay, and in some cases packet retransmissions. ?There is a pair of switches that all traffic converges upon. The link between the two switches is a 100/Full Fast Ethernet connection that is operating at near maximum capacity for the majority of the day. ?At any given time, the estimated traffic on the link between the two switches is 200 Mbps. Which two configuration changes will improve the voice quality of the VoIP calls and prevent possible VoIP issues in the future between these two switches? (Choose two.)
A. Place a router between the two switches and configure the 100 Mbps links to the two switches with a higher QoS for VoIP traffic.
B. Prioritize the traffic on the switches to give VoIP improved QoS. Prioritize only the traffic on the switches to give VoIP calls improved QoS.
C. Provide a larger aggregated bandwidth of 300 Mbps by trunking three interfaces together on the two switches using Multilink Trunks (MLTs).
D. Purchase two new Layer 2 switches that are capable of gigabit Ethernet to replace the Fast Ethernet connection with a single gigabit Ethernet connection.
Answer: BC

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