642-642 Exam Information
Quality of Service (QoS)
Exam Number/Code : 642-642
Exam Name : Quality of Service (QoS)
Questions and Answers : 181 Q&As
1. After learning QoS, for the following options, Which of the following characterize problems that could occur with voice traffic when QoS is not applied in a network?(choose two)
A. Voice sounds choppy.
B. Calls are disconnected.
C. VoIP broadcasts increase as Queuing delay increases, causing delay and caller interaction problems.
D. Voice call requires more bandwidth as lost packets are retransmitted.
Answer: AB
2. SLA(Service-Level Agreement) is a contract between a network service provider and a customer, which usually defines such terms as the type of service, the quality of service and the customer’s payment. In an unmanaged CE router implementation, how does the service provider enforce the SLA?
A. by using class-based policing on the CE to PE link to limit the customer’s input rate
B. by using class-based random discard on the CE to PE link to limit the customer’s input rate
C. by marking on the CE to PE link and using CBWFQ and CB-WRED on the PE to P link
D. by marking on the CE to PE link and using class-based policing on the PE to P link
Answer: A
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