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Cisco 642-785 Dumps

Cisco
Maintaining Cisco Service Provider Quality of Service (MSPQS)
Cisco
Maintaining Cisco Service Provider Quality of Service (MSPQS)

Questions & Answers for Cisco 642-785

Showing 1-15 of 91 Questions

Question #1

Refer to the exhibit.

The voice traffic is not receiving the appropriate per-hop behavior at the egress of the CE-
PE link. What is the problem?

A. Both ACLs are misconfigured.

B. Both class maps are misconfigured.

C. The control traffic class should be configured with the priority command instead of the bandwidth command.

D. Instead of hard coding the actual bandwidth on the priority and bandwidth commands, the percent option should be used.

Question #2

Which two Cisco IOS commands can be used to monitor QoS on a device? (Choose two.)

A. show class-map

B. show qos-maps

C. show policy-map

D. show service-policy

E. show qos-interface

F. show qos-dbl

Question #3

Within a QoS policy-map configuration, one of the traffic classes is configured with the
random-detect dscp-based configuration command. What will that command accomplish?

A. provides congestion management by queueing the traffic using CBWFQ

B. provides congestion management by queueing the traffic using LLQ

C. decreases the probability of congestion by selectively dropping TCP packets before the queue is full

D. provides congestion avoidance by selectively delaying the delivery of packets with lower DSCP priority

E. decreases congestion by avoiding global UDP synchronization

Question #4

Which tool is best suited to provide incident management or trouble ticketing?

A. Remedy

B. CiscoWorks

C. Tivoli

D. Voyence

E. Intelliden

Question #5

An MPLS VPN customer reports that the VoIP voice quality is very bad for calls across the
MPLS VPN. What could be the problem?

A. Traffic shaping is applied to the voice traffic class.

B. The voice traffic class is using the priority command.

C. The voice packets are marked as DSCP EF.

D. WRED is not configured for the voice traffic class.

E. The voice traffic class is using the default queue size.

Question #6

What are the benefits of using differentiated services in the service provider backbone?
(Choose two.)

A. simple, easy to design, deploy, and operate

B. less bandwidth required to achieve the same SLA

C. more aggregate traffic supported

D. overprovision by two times the maximum aggregate

Question #7

A customer with an unmanaged CE router has reported experiencing poor quality on the
video conferencing and broadcast multimedia applications. To address the issue, the
provider has implemented shaping on the PE router to "smooth out" speed mismatches in
the network. Which of these is a valid concern with this approach?

A. In addition to shaping, the provider should implement policing so the application can detect the congestion and throttle traffic.

B. Shaping can only be applied to the outbound interface, which does not prevent the customer from flooding the inbound link to the provider.

C. Shaping should only be used in a TCP-based environment where the application can detect the congestion and adjust. Shaping provides little benefit with UDP applications.

D. While shaping may help the broadcast multimedia application, it could cause additional delay in the video conferencing application.

Question #8

What are the three primary types of faults associated with QoS fault management?
(Choose three.)

A. classification faults

B. buffer faults

C. queue faults

D. marking faults

E. assurance faults

F. physical faults

Question #9

Which Cisco IOS XR Software command clears the service-policy counters on the 10
Gigabit interface 0/0/0/0 at the ingress direction?

A. clear qos counters tenGigE 0/0/0/0 input

B. clear service-policy counters tenGigE 0/0/0/0 input

C. clear qos counters tenGigE 0/0/0/0 ingress

D. clear service-policy counters tenGigE 0/0/0/0 ingress

E. clear counters qos tenGigE 0/0/0/0 input

F. clear counters service-policy tenGigE 0/0/0/0 input

Question #10

Which Cisco IOS IP SLA Probe would you select to identify bottlenecks in the network?

A. ICMP Path Jitter

B. ICMP Echo

C. ICMP Path Echo

D. FTP Path Echo

Question #11

Where do service providers apply policy when traffic is leaving the customer network?
(Choose two.)

A. Apply input policy on the CE interface toward PE, if CE is unmanaged.

B. Apply input policy on the PE interface toward CE, if CE is unmanaged.

C. Apply input policy on the PE interface toward CE, if CE is managed.

D. Apply output policy on the PE interface toward CE, if CE is managed.

E. Apply output policy on the CE interface toward PE, if CE is managed.

Question #12

A customer is experiencing poor quality on voice connections coming from a particular
branch office. Data on the service provider network capacity indicates that the devices
serving that location are heavily oversubscribed. It will be months before planned
expansions can be implemented. Which class-based traffic-shaping technique would be
appropriate to consider implementing?

A. shaping to the committed rate

B. shaping to the peak rate

C. shaping to the observed median rate

D. shaping to the configured average rate

Question #13

Which three can be monitored by IP SLA? (Choose three.)

A. jitter

B. packet loss

C. buffer allocation

D. network delay

E. queue utilization

Question #14

A provider plans to use IP SLA to help diagnose future performance issues in their PE
routers in the network. Which two should be considered by the provider? (Choose two.)

A. IP SLA requires a significant amount of resources to operate properly. Using IP SLA on the PE routers will only aggravate performance-related issues the network already encounters.

B. IP SLA is supported only on Cisco IOS edge routers, because it simulates traffic from the network endpoints.

C. IP SLA should be implemented on dedicated hardware to properly simulate network endpoints.

D. IP SLA should use a mix of source and target points.

Question #15

Which Cisco IOS XR command will help troubleshoot why a policy map fails to apply on an
interface?

A. show service-policy interface tenGigE 0/0/0/0

B. show policy-map interface tenGigE 0/0/0/0

C. show policymgr qos trace all

D. show qos interface tenGigE 0/0/0/0

E. clear qos counters

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