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Cisco 642-785 Exam Syllabus Topics:

Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:

1. Which two IP SLA Probe types can be used to measure voice quality? (Choose two.)

A) ICMP Path Jitter
B) UDP Delay
C) UDP Jitter
D) HTTP
E) UDP Echo
F) UDP MOS

2. 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 peak rate
B) shaping to the observed median rate
C) shaping to the committed rate
D) shaping to the configured average rate

3. Which of these describes Short Pipe mode in QoS for MPLS VPN service providers?

A) Service provider can remark customer DSCP values.
B) Service provider does not remark customer DSCP values. (Service provider uses independent MPLS EXP markings.) Final PE-to-CE policies are based on customer markings.
C) The customer and service provider share the same DiffServ domain.
D) Service provider does not remark customer DSCP values. (Service provider uses independent MPLS EXP markings.) Final PE-to-CE policies are based on service provider markings.

4. Refer to the exhibit.

A provider uses the recommended mappings for DSCP to MPLS EXP. Several sites connected to the same PE router report that critical data has been experiencing a high number of drops. The customer marks its CRITICAL data as AF31. What appears to be the problem?

A) The recommended mapping for AF31 is to MPLS EXP 5, which is classified in the REALTIME class, not the CRITICAL DATA class.
B) If the data receiving drops is high priority, it should be marked with MPLS EXP value 7.
C) The allocated bandwidth for CRITICAL-DATA should be increased to provide sufficient bandwidth to support the application.
D) The provider is using the recommended mappings for DSCP to MPLS EXP, so the CLASS-MAP for the CRITICAL-DATA should contain EXP value of 4.
E) The classification for CRITICAL-DATA should contain a match-all, not a match-any.

5. The provider you work for supports a wide range of Cisco router models and Cisco IOS Software releases. You are in the process of moving to a SNMP-based tool to monitor QoS configurations and statistics. What are some of the challenges to this approach?

A) SNMP should be used in conjunction only with Cisco IP SLA to ensure that the information gathered is reported properly.
B) The SNMP MIB provides direct access into the QoS configuration parameters. Poor configuration could lead to changes that are difficult to track.
C) Some models of Cisco routers do not have full support for the class-based QoS MIB, which results in a number of elements that cannot be managed.
D) Older versions of Cisco IOS Software do not maintain index persistency, which results in significant changes in the information that is collected unless properly configured.

Solutions: