Online Access Free 642-785 Practice Test

You work for service provider that employs a four-class service provider QoS model (best effort, bronze, silver, gold). A customer recently reported an issue with high drop rate on a mission-critical database application in the silver class. The silver class is currently at capacity. The gold class is currently only used for voice and video conferencing, and has available bandwidth. The application was remapped to the gold class. Which statements are valid alternative options to this decision? (Choose two.)

• A.Additional bandwidth should have been added to the silver class from one of the lower classes before the traffic class was moved.
• B.Moving to a three-class QoS model would allow for more bandwidth per class and would reduce the support of maintaining multiple classes.
• C.In addition to the remapping, the provider would have to change the queue model from WFQ to priority queued.
• D.The provider should consider moving to a six-class QoS model to provide more available classes of service to differentiate traffic.

Which three match statements are valid in Cisco IOS XR Software? (Choose three.)

• A.match vpls
• B.match field
• C.match mpls experimental topmost
• D.match port-type
• E.match qos-group
• F.match flow

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.While shaping may help the broadcast multimedia application, it could cause additional delay in the video conferencing application.
• C.Shaping can only be applied to the outbound interface, which does not prevent the customer from flooding the inbound link to the provider.
• D.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.

Which Cisco IOS command lists all traffic classifications?

• A.show class-map
• B.show service-policy
• C.show policy-map
• D.show qos

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