Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) 認定 642-785 試験問題:

1. You have deployed IP SLA in your network to monitor VoIP. You want to be notified on network delay before it affects voice quality. What threshold should be set?

A) 150 ms round trip
B) 150 ms one-way
C) 50 ms round trip
D) 200 ms round trip
E) 250 ms one-way

2. Refer to the exhibit.

The QoS profile was recently updated to mark VoIP traffic with a DSCP setting of AF41. However, the traffic going to the phones in the 172.19.5.0/24 address space is not being marked properly. What is causing this problem?

A) The access list does not properly identify SIP traffic.
B) Class typeA markings appear first in the policy map, which causes this marking to be applied.
C) The traffic policy is not written correctly, which causes the wrong marking to be applied.
D) The VoIP classification should be configured before any other classifications, because it is the highest priority.

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) decreases congestion by avoiding global UDP synchronization
B) provides congestion management by queueing the traffic using CBWFQ
C) provides congestion management by queueing the traffic using LLQ
D) provides congestion avoidance by selectively delaying the delivery of packets with lower DSCP priority
E) decreases the probability of congestion by selectively dropping TCP packets before the queue is full

4. A service provider will apply this policy at which of these interfaces?
interface Gi1/1 service-policy output SP-POLICY ! policy-map SP-POLICY class TRAFFIC-CLASS-1 police rate percent 20 conform-action transmit exceed-action drop priority ! class TRAFFIC-CLASS-2 bandwidth percent 50 queue-limit 800 ms random-detect exp 3 280 ms 490 ms ! class class-default queue-limit 500 ms random-detect exp 1 200 ms 350 ms random-detect exp 0 100 ms 200 ms ! end-policy-map ! class-map match-any TRAFFIC-CLASS-1 match dscp ipv4 45 ef cs6 match mpls experimental topmost 5 6 end-class-map ! class-map match-any TRAFFIC-CLASS-2 match dscp ipv4 cs2 af21 af23 af31 af32 af33 35 37 match mpls experimental topmost 3 end-class-map !

A) PE interface toward P
B) PE interface toward CE
C) CE interface toward PE
D) P interface toward PE

5. Which two statements about IP SLA are correct? (Choose two.)

A) Cisco IOS IP SLA is Layer 2 transport independent.
B) IOS IP SLA is a traffic monitoring mechanism that gathers statistics about traffic based on packet headers and fields.
C) IP SLA uses NBAR to provide the reporting engine for statistics that it collects.
D) Cisco IOS IP SLA can be used to help detail billing information for each defined class of service.
E) IOS IP SLA uses active traffic monitoring which allows users to analyze service levels for IP applications.

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