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dress 0008.A3D1.FBC4 ?-?-OUTPUT OMITTED?-?- 1 number 1000
The highlighted commands in this example indicate the commands automatically entered by the AutoQoS VoIP feature. After AutoQoS VoIP is applied, router R1 begins to mark RTP audio packets (that is, voice packets) with a DSCP PHB of EF. Then, when those voice packets reach router R2, router R2 is able to classify them into the VOICE class newport cartons, which receives priority treatment in being sent out over the Frame Relay WAN links, thus resolving the reported issue.
Chapter 11: IP Communications Troubleshooting
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Exam Preparation Tasks Review All Key Topics
Review the most important topics from inside the chapter, noted with the Key Topics icon in the outer margin of the page. Table 11-8 lists these key topics and the page numbers where each is found. Table 11-8 Key Topics for Chapter 11 Description IP telephony components Symptoms of having a lack of bandwidth Supporting services for voice traffic Boot-up process for a Cisco IP Phone Common voice troubleshooting targets MQC steps MQC sample configuration MQC verification commands AutoQoS platform support AutoQoS configuration prerequisites Recommended QoS metrics for video IGMP versions Common video troubleshooting targets Page Number 330 331 332 335 335 336 337 338 341 342 348 350 358
Key Topic
Key Topic Element List List List Steps Table 11-2 List Example 11-1 Table 11-3 Table 11-4 List Table 11-5 List Table 11-6
Complete Tables and Lists from Memory
Print a copy of Appendix B, "Memory Tables," (found on the CD) or at least the section for this chapter, and complete the tables and lists from memory. Appendix C, "Memory Tables Answer Key," also on the CD, includes completed tables and lists to check your work.
Define Key Terms
Define the following key terms from this chapter, and check your answers in the Glossary: Voice over IP (VoIP) buy newports online, IP telephony, unified communications, IP phone, gatekeeper, gateway, multipoint control unit (MCU), call agent, application server, videoconference station, delay, jitter, drops discount newport cigarettes, Differentiated Services Code Point (DSCP), Modular Quality of Service Command-Line Interface (MQC), AutoQoS VoIP, AutoQoS Enterprise, Cisco
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CCNP TSHOOT 642-832 Official Certification Guide Unified Video Advantage, Cisco TelePresence, multicasting newports cigarettes website, Internet Group Management Protocol (IGMP), Protocol Independent Multicast (PIM), rendezvous point (RP)
Command Reference to Check Your Memory
This section includes the most important configuration and EXEC commands covered in this chapter. To determine how well you have memorized the commands as a side effect of your other studies, cover the left side of the table with a piece of paper, read the descriptions on the right side, and see whether you remember the command. Table 11-9 Command class-map [match-any | matchall] class-name policy-map policy-name class class-name service-policy output policy-map-name auto qos voip [trust] [fr-atm] Chapter 11 Configuration Command Reference