Cisco 642-437 Actual Free Exam Questions & Community Discussion
Which QoS methodology combines strict priority queuing with class-based weighted fair queuing?
Correct Answer: E
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Using the Cisco QoS baseline model, what are the PHB, DSCP, and CoS values for voice traffic, respectively?
Correct Answer: C
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Refer to the exhibit.
Consider an outgoing call that is being placed in all three scenarios that are shown in the exhibit. What is the result of the call, going down the table from top to bottom?
Consider an outgoing call that is being placed in all three scenarios that are shown in the exhibit. What is the result of the call, going down the table from top to bottom?
Correct Answer: E
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Which four are benefits of VLANs in an organization? (Choose four.)
Correct Answer: A,B,C,D
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Which QoS mechanism for VoIP works with weighted fair queuing (WFQ) and class-based weighted fair queuing (CBWFQ)?
Correct Answer: E
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Refer to the exhibit.
Cisco 642-437 Exam
When a voice-signaling packet arrives at the router with a DSCP value of AF31, which two options describe how it will be treated? (Choose two.)
Cisco 642-437 Exam
When a voice-signaling packet arrives at the router with a DSCP value of AF31, which two options describe how it will be treated? (Choose two.)
Correct Answer: D,E
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How many VoIP G.711 calls can be made simultaneously over a 256-kb/s Frame Relay circuit (Layer 3) if cRTP is enabled and the default IOS voice payload size of 160 is used?
Correct Answer: C
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Assuming no cRTP or header compression. How many VoIP G.729 calls can be made simultaneously over a 128-kb/s Frame Relay circuit (Layer 3) if 50 percent of the circuit is dedicated to voice and 50 percent is dedicated to data?
Correct Answer: A
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What are the three acceptable values for one-way delay, jitter, and packet loss in a VoIP network? (Choose three.)
Correct Answer: B,C,F
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When Cisco Unified Communications Manager Express is used, which type of files are used to enable phone displays and operations?
Correct Answer: D
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DRAG DROP
Assume a SIP voice network. Drag each characteristic to the type of SIP call setup the characteristics best describes.
Assume a SIP voice network. Drag each characteristic to the type of SIP call setup the characteristics best describes.
Correct Answer:
Cisco 642-437 Exam
Explanation:
Direct call setup:
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Nonscalable
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UA must keep data on large number of destinations
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Relies on cached information to resolve addresses Redirect Server Call Setup:
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Server reports back to a UA with destination coordinates Proxy Server Call Setup:
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Most dynamic address resolution capability
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All setup messages to through server
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UA incapable of establishing its own sessions
http://www.cisco.com/en/US/tech/tk652/tk701/technologies_configuration_guide_chapter09186a00 80163444.html
Which of the Diffserv differentiated services code point per-hop behaviors is used for low-delay services including VoIP and video over IP?
Correct Answer: B
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