Pass4side 642-642 latest demo download

Cisco 642-642 (Quality of Service) latest Demo download

1. 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

2. Refer to the following parameters, which of the following are not traffic characteristics that can be affected by QoS tools?
A. Delay
B. MTU
C. Reliability
D. Bandwidth
Answer: C

3. For the following statements about packet loss, which of the following is the most likely reason for packet loss in a typical network?
A. Jitter thresholds being exceeded
B. TCP flush messages as a result of Round-Trip Times varying wildly
C. Tail drops when queues fill
D. Bit errors during transmission
Answer: C

4. By learning voice ,Ignoring Layer 2 overhead, how much bandwidth is required for a VoIP call using a G.729 coded? (Link: Voice Bandwidth Considerations)
A. 16 kbps
B. 32 kbps
C. 24 kbps
D. 8 kbps
Answer: C

5. Based on the judgement of voice traffic, which two components are of delay for a VoIP call, but not for a data application?(choose two)
A. Packetization delay
B. Serialization delay
C. Queuing delay
D. Filling the De-jitter buffer
Answer: AD

6. The FRF.12 specification describes the method of fragmenting Frame Relay frames into smaller frames. Refer to the following technologies, which one is required when configuring FRF.12 on a Cisco device?
A. FRF.8
B. VoFR
C. MLP with interleaving
D. FRF11.c
E. FRTS
Answer: E

7. On the basis of the deep understanding of voice and video traffic .Which of the following are true statements of both Voice and Video conferencing traffic?(choose two)
A. All packets in a single call or conference are a of single size
B. Traffic is isochronous
C. Sensitive to delay
D. Sensitive to jitter
Answer: CD

8. Based on the understanding of QoS Policy, Which of the following are not one of the major planning steps when implementing QoS Policies?
A. Define QoS policies for each class
B. Identify traffic and its requirements
C. Mark traffic as close to the source as possible
D. Divide traffic into classes
Answer: C

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