| 思科QOS基础 |
Exam 642-641：
Quality of Service Exam (QoS) |
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| 基础介绍 |
| CCIP认证的必要组成部分，在这门课程中间，描述思科在IP网络实施QoS的机制，两种QoS模式的概念及区别；在Cisco的IOS平台上如何实现QoS的机制；实现对IP数据包的分类；在接口上实施队列机制；配置RSVP等。它是CCIP的四门必考科目之一. |
考试摘要 |
| QoS is a qualifying exam for the Cisco
Certified Internetwork Professional CCIP certification.
The QoS exam (642-641) will test |
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| 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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| 考试范围 |
Introduction to IP Quality of Service
Describe the need for IP QoS
Describe the Integrated Services model
List the key benefits and drawbacks of the IntServ model
Describe the Differentiated Services model
List the key benefits of the DiffServ model compared to
the IntServ model
Describe the interoperability between DSCP-based and IP-precedence-based
devices in a network
Describe the building blocks of IP QoS mechanisms (classification,
marking, metering, policing, shaping, dropping, forwarding,
queuing)
List the IP QoS mechanisms available in the Cisco IOS
Describe what QoS features are supported by different
IP QoS mechanisms
Classification and Marking Mechanisms
Describe Policy-based routing and how it can be used to
classify and mark IP packets
Configure the Policy-based routing mechanism on Cisco
routers
Describe QoS Policy Propagation through BGP and how it
can be used to classify and mark IP packets
List other mechanisms that also support classification
and marking capabilities (Committed Access Rate, Class-based
Marking)
Queuing Mechanisms
Describe how queuing works on Cisco routers
Describe FIFO Queuing (FQ) and its benefits and drawbacks
Describe Priority Queuing (PQ) including its benefits
and drawbacks
Configure Priority Queuing (PQ) on Cisco routers
Describe Custom Queuing (CQ) including its benefits and
drawbacks
Configure Custom Queuing (CQ) on Cisco routers
Describe Weighted Fair Queuing (WFQ) including its benefits
and drawbacks
Configure Weighted Fair Queuing (WFQ) on Cisco routers
Describe different distributed Weighted Fair Queuing (dWFQ)
mechanisms available on Cisco IOS routers
Describe Modified Deficit Round Robin (MDRR) queuing
Describe IP RTP Prioritization
Configure IP RTP Prioritization on Cisco routers
Traffic Shaping and Policing Mechanisms
Describe shaping and policing mechanisms available in
Cisco IOS
Describe the benefits and drawbacks of traffic shaping
and policing mechanisms
Describe Generic Traffic Shaping (GTS) on Cisco routers
Configure GTS on Cisco routers
Describe Frame Relay Traffic Shaping (FRTS) and its differences
from GTS
Configure Frame Relay Traffic Shaping (FRTS) on Cisco
routers
Describe the Committed Access Rate (CAR) mechanism including
its benefits and drawbacks
Configure Committed Access Rate (CAR) on Cisco Routers
Congestion Avoidance Mechanisms
Describe Random Early Detection (RED)
Describe the Weighted Random Early Detection (WRED) mechanism
Configure Weighted Random Early Detection (WRED) on Cisco
routers
Describe the Flow-based WRED mechanism
Link Efficiency Mechanisms
Describe payload compression and payload compression algorithms
available on Cisco routers
Describe header compression and header compression algorithms
available on Cisco routers
Configure Cisco IOS header compression mechanisms
Describe Link Fragmentation and Interleaving (LFI)
Configure Link Fragmentation and Interleaving (LFI) mechanisms
on Cisco IOS routers
Signaling Mechanisms
Describe Resource Reservation Protocol (RSVP)
Configure RSVP on Cisco IOS routers
Modular QoS Command Line Interface
Describe the Modular QoS CLI (MQC) concept and its structure
Describe Modular QoS CLI classification options
Configure the Modular QoS CLI to perform classification
Describe Network-based Application Recognition (NBAR)
Describe Modular QoS CLI policy options
Configure the Modular QoS CLI to perform service policies
QoS and IP over ATM
List the requirements of IP QoS in combination with ATM
QoS
Describe per-VC queuing
Describe and configure per-VC WRED
Describe and configure per- VC CB-WRQ |
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