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最新的 CCNP SP Operations 642-785 免費考試真題:

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

A) clear qos counters
B) show policymgr qos trace all
C) show service-policy interface tenGigE 0/0/0/0
D) show policy-map interface tenGigE 0/0/0/0
E) show qos interface tenGigE 0/0/0/0

2. Refer to the exhibit.

You have implemented RFC 3270 Pipe mode in your MPLS network. A customer packet with the DSCP value of AF31 has been sent to the ingress PE router. The PE router has set the MPLS experimental bits per policy, but the policer has remarked the experimental bits of the top label. What will the DSCP value of the packet be when it leaves the egress PE router?

A) CS4
B) BE
C) CS3
D) AF31
E) CS1

3. What three statements about WRED are true? (Choose three.)

A) Using WRED will necessitate a large number of dropped packets.
B) WRED should always be used in traffic classes that support a MIX of realtime UDP and TCP traffic.
C) WRED is a congestion avoidance technique.
D) WRED employs a weighted method for determining which packets to drop to avoid congestion. Packets with a higher precedence are less likely to be dropped.
E) Using WRED on the edge devices (CE, PE) is an effective method of implementing
congestion avoidance in the service provider network, because it avoids the congestion prior to reaching the core.

4. 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.

5. Which three components would you use to define and apply traffic classification? (Choose three.)

A) service policy
B) route map
C) policy map
D) route policy
E) class map

問題與答案：