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IT Certification and Career Paths 642-641 QOS
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Quality of Service Exam
RETIRED
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| Exam Number: |
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642-641 |
| Associated Certifications: |
CCIP |
| Available Languages: |
English |
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QoS is a qualifying exam for the Cisco Certified Internetwork Professional CCIP certification. The QoS exam (642-641) will test materials covered under the Implementing Quality of Service (IQoS) course. The exam will certify that the successful candidate has knowledge and skills necessary to configure and troubleshoot Cisco IOS routers running Quality of Service protocols in a Service Provider environment. The exam covers topics on IP QoS, classification and marking Mechanisms, queuing mechanisms, traffic shaping and policing mechanisms, congestion avoidance mechanisms, link efficiency mechanisms, signaling mechanisms, modular QoS command line interface, and QoS & IP over ATM.
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The following information provides general guidelines for the content likely to be included on the QoS exam. However, other related topics may also appear on any specific delivery of the exam.
Introduction to IP Quality of Service
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Describe the need for IP QoS |
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Describe the Integrated Services model |
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List the key benefits and drawbacks of the IntServ model |
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Describe the Differentiated Services model |
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List the key benefits of the DiffServ model compared to the IntServ model |
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Describe the interoperability between DSCP-based and IP-precedence-based devices in a network |
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Describe the building blocks of IP QoS mechanisms (classification, marking, metering, policing, shaping, dropping, forwarding, queuing) |
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List the IP QoS mechanisms available in the Cisco IOS |
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Describe what QoS features are supported by different IP QoS mechanisms |
Classification and Marking Mechanisms
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Describe Policy-based routing and how it can be used to classify and mark IP packets |
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Configure the Policy-based routing mechanism on Cisco routers |
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Describe QoS Policy Propagation through BGP and how it can be used to classify and mark IP packets |
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List other mechanisms that also support classification and marking capabilities (Committed Access Rate, Class-based Marking) |
Queuing Mechanisms
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Describe how queuing works on Cisco routers |
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Describe FIFO Queuing (FQ) and its benefits and drawbacks |
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Describe Priority Queuing (PQ) including its benefits and drawbacks |
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Configure Priority Queuing (PQ) on Cisco routers |
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Describe Custom Queuing (CQ) including its benefits and drawbacks |
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Configure Custom Queuing (CQ) on Cisco routers |
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Describe Weighted Fair Queuing (WFQ) including its benefits and drawbacks |
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Configure Weighted Fair Queuing (WFQ) on Cisco routers |
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Describe different distributed Weighted Fair Queuing (dWFQ) mechanisms available on Cisco IOS routers |
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Describe Modified Deficit Round Robin (MDRR) queuing |
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Describe IP RTP Prioritization |
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Configure IP RTP Prioritization on Cisco routers |
Traffic Shaping and Policing Mechanisms
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Describe shaping and policing mechanisms available in Cisco IOS |
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Describe the benefits and drawbacks of traffic shaping and policing mechanisms |
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Describe Generic Traffic Shaping (GTS) on Cisco routers |
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Configure GTS on Cisco routers |
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Describe Frame Relay Traffic Shaping (FRTS) and its differences from GTS |
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Configure Frame Relay Traffic Shaping (FRTS) on Cisco routers |
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Describe the Committed Access Rate (CAR) mechanism including its benefits and drawbacks |
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Configure Committed Access Rate (CAR) on Cisco Routers |
Congestion Avoidance Mechanisms
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Describe Random Early Detection (RED) |
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Describe the Weighted Random Early Detection (WRED) mechanism |
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Configure Weighted Random Early Detection (WRED) on Cisco routers |
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Describe the Flow-based WRED mechanism |
Link Efficiency Mechanisms
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Describe payload compression and payload compression algorithms available on Cisco routers |
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Describe header compression and header compression algorithms available on Cisco routers |
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Configure Cisco IOS header compression mechanisms |
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Describe Link Fragmentation and Interleaving (LFI) |
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Configure Link Fragmentation and Interleaving (LFI) mechanisms on Cisco IOS routers |
Signaling Mechanisms
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Describe Resource Reservation Protocol (RSVP) |
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Configure RSVP on Cisco IOS routers |
Modular QoS Command Line Interface
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Describe the Modular QoS CLI (MQC) concept and its structure |
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Describe Modular QoS CLI classification options |
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Configure the Modular QoS CLI to perform classification |
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Describe Network-based Application Recognition (NBAR) |
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Describe Modular QoS CLI policy options |
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Configure the Modular QoS CLI to perform service policies |
QoS and IP over ATM
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List the requirements of IP QoS in combination with ATM QoS |
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Describe per-VC queuing |
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Describe and configure per-VC WRED |
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Describe and configure per- VC CB-WRQ |
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Implementing Cisco Multicast (MCAST) and Quality of Service (QoS) are the recommended training for this exam.
Courses listed are offered by Cisco Learning Partners—the only authorized source for Cisco IT training delivered exclusively by Certified Cisco Instructors. Check the List of Learning Partners for a Cisco Learning Partner nearest you.
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A variety of Cisco Press Self-Study titles are available for this exam. These titles can be purchased at the Cisco Marketplace, directly from Cisco Press, or wherever you purchase technical books.
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