Answer: C

29. What is a key benefit of using the Cisco Modular QoS Command Line Interface (MQC)?
A. Provides performance metrics for QoS configurations.
B. Eliminates the need for map classes to perform traffic classification.
C. Allows users to specify traffic classes independently from QoS polices.
D. Allows QoS policy information to be automatically distributed throughout the network.
E. Provides an integrated testing mechanism for traffic classification and QoS policy configurations.

Answer: C

30. What is the effect of enabling Weighted Fair Queuing (WFQ) on low-speed router interface?
A. Delay is guaranteed for high-priority traffic types.
B. Bandwidth is guaranteed for different traffic queues.
C. Fixed-size queues are pre-allocated for different traffic flows.
D. Low-bandwidth traffic receives priority over high-bandwidth traffic.

Answer: D

31. What is the function of Modular QoS Command Line Interface (MQC) classification?
A. to identify traffic independently of QoS polices
B. to mark traffic based on the Class Latency index (CLI)
C. to route traffic based on the multiple QoS policies
D. to group QoS configuration commands into modules to ease configuration
E. To aggregate traffic onto one QoS classification for operational efficiency (CPU and Memory)

Answer: A

32. On a Cisco switch, CDP v2 must be enabled for which AutoQoS configuration to function properly?
A. WTT queuing
B. trust boundary
C. fr-atm
D. ciscosoflphone

Answer: B

33. What three actions can reduce packet sizes on WAN links supporting converged VoIP and data? (Choose three)
A. Configure LFI to an average packet size for all traffic on the WAN link
B. Configure compressed RTP headers
C. Configure software payload compression
D. Configure hardware payload compression
E. Configure LFI to the same size as the voice packets.

Answer: BCE

34. What will happen when class-based header compression is configured without specifying RTP or TCP?
A. Only TCP headers will be compressed
B. Only RTP headers will be compressed
C. The unrecognized command warning is returned.
D. RTP and TCP headers will be compressed

Answer: D

35. What are the benefits, as listed in the DQOS course, for Enterprise Networks when QoS is implemented? (Choose all that apply.)
A. It sets traffic priorities across the network.
B. It allows better LAN performance through Per QOS Spanning Tree (PQST).
C. It minimizes loss during bursty congestion.
D. It allows for the disconnection of calls.
E. It reduces the amount of data sent through the network using Content Distribution Networking (CDN).

Answer: AC

36. In which way does the Integrated Services model differ from the Differentiated Services model?
A. Integrated Services is more scalable than Differentiated Services.
B. Integrated Services provides traffic preferences, but no guaranteed delivery.
C. Integrated Services uses RSVP to signal the requested level of service, whereas Differentiated Services does not use any signaling.
D. Integrated Services does not make use of any signals whereas Differentiated Services uses signals to request level of services.
E. Integrated Services uses IP Precedence whereas Differentiated Services uses the DSCP.

Answer: C

37. You are the network administrator at PassGuide . The newly appointed PassGuide trainee wants to know what are the best practices when designing a network for QoS. What will your reply be? (Choose all that apply.)
A. To color close to the application
B. To perform marking at WAN edge routers prior to packets exiting a WAN port.
C. To create a trust boundary as close as possible to the network edge.
D. To reclassify QoS settings near to the edge when devices seem dodgy and untrustworthy.
E. All of the above.

Answer: ACD

38. A CE to PE Frame Relay link is supporting VoIP and data traffic. When managed CE services are being used, which QoS mechanisms should typically be configured? (Choose four)
A. Frame Relay Traffic Shping (FRTS) on both the CE and PE
B. FRF 12 on both the CE and PE
C. WRED for all traffic classes on both the CE and PW
D. LLW on the CE and PE
E. class-based policing on the CE ingress for traffic to the customer
F. class-based policing ono the PE ingress for traffic to the customer

Answer: ABEF

39. How does CB-Shaping adapt the shaping rate when BECNs are received?
A. The shape-adaptive min-rate command adapts the shaping rate when FECN bits are received
B. Each BECN bit causes the shaping rate to be reduced by three-quarters of the previous rate, but not below the min-rate
C. When FECN bits are received, it causes the transmit shaping rate to be reduced by one-half, but not below the min-rate
D. The shaping rate will increase slowly once there have been 16 intervals of no FECNs.

Answer: B

40. Which term describes the amount of time it takes to place all of the bits in a packet onto a wire?
A. queuing delay
B. processing delay
C. propagation delay
D. serialization delay
E. prioritization delay
F. optimization delay

Answer: D

41. How is AutoQoS related to MQC?
A. AutoQoS implements classes and policies defined earlier in MQC
B. duplicates policies defined in MQC from one device to another
C. generates MQC classes and policy map templates
D. runs an interactive script to guide the administrator through MQC

Answer: C

42. The newly appointed PassGuide trainee technician wants to know what steps are used to implement QoS using Modular QoS Command Line Interface (MQC). What will your reply be? (Choose all that apply.)
A. Select an output queuing strategy using a queue map.
B. Attach the QoS traffic policy to an interface in the inbound or outbound direction.
C. Configure marking options using a route map.
D. Configure classification options using a class map.
E. Configure a QoS traffic policy by associating a QoS traffic class with a QoS feature.

Answer: BDE

43. What happens to traffic that does not have a match when using a Modular QoS Command Line Interface (MQC)?
A. It is ignored by the MQC
B. It is dropped (implicit deny all)
C. It is placed in the default class
D. It is process switched through the router

Answer: C

Exam Number/Code: 642-642
Exam Name: Quality of Service (QoS)
For candidates making preparation for the Cisco 642-642 exam, what they most desire is to easily pass the 642-642 (Quality of Service (QoS)) exam. PassGuide 642-642 includes 180 questions and answers, which are collected and collated by experts of Cisco. With our 642-642 study materials, you can successfully take Cisco certification of 642-642 exam and go further on Cisco career path.

Quality of Service (QOS)

Q&A V3.20

www.PassGuide.com

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1. Which of the following markers can be set by Committed Access Rate (CAR)? (Choose all that apply.)
A. DSCP bits
B. QoS Group
C. ATM CLP bit
D. Frame Relay DE bit
E. IP precedence bits

Answer: ABE

2. What makes the DiffServ model more scalable than the IntServ model? (Choose all that apply.)
A. DiffServ makes use of per-aggregate QoS instead of per-flow QoS.
B. DiffServ makes use of hop-by-hop signaling which allows DiffServ to scale to a larger number of application flows.
C. DiffServ is capable of implementing admission control either locally on the routers or be offloaded to a central policy server using the COPS protocol.
D. DiffServ routers are not compelled to track the state information for each individual flow.

Answer: AD

3. The newly appointed PassGuide trainee technician wants to know what the benefits of using traffic shaping to implement network rate limiting is.What will your reply be? (Choose all that apply.)
A. Traffic shaping is an effective tool for rate-limiting VoIP traffic.
B. It will not increase packet loss.
C. It will not add to packet transit delays.
D. Traffic shaping can interact with congestion mechanisms embedded in Frame Relay.
E. Traffic shaping can be used on inbound and outbound traffic on a router.

Answer: BD

4. Study the Exhibit below carefully: Router# show interfaces hssi 0/0/0 rate-limit Hssi0/0/0 45Mbps to R1 Input matches: all traffic params: 20000000 bps, 24000 limit, 24000 extended limit conformed 8 packets, 428 bytes; action: transmit exceed 0 packets, 0 bytes; action: drop last packet: 8680ms ago, current burst: 0 bytes last cleared 00:03:59 ago, conformed 0 bps, exceed 0 bps Output matches: all traffic params: 20000000 bps, 24000 limit, 24000 extended limit conformed 0 packets, 0 bytes; action: transmit exceed 0 packets, 0 bytes; action; drop last packet: 8680ms ago, current burst: 0 bytes last cleared 00:03:59 ago, conformed 0 bps, exceed 0 bps According to the exhibit, the router has been configured with Committed Access Rate (CAR) to rate limit traffic. What data rate has the traffic been limited to?
A. 192 Kbps
B. 2400 Kbps
C. 4,5 Mbps
D. 20 Mbps
E. 40 Mbps

Answer: D

5. The newly appointed PassGuide trainee technician wants to know which type of software queuing mechanism is Frame Relay Traffic Shaping implemented with on the physical interface. What will your reply be?
A. Priority Queuing (PQ)
B. Custom Queuing (CQ)
C. FIFO
D. Weighted Fair Queuing (WFQ)
E. IP Real Time Transport Protocol (RTP) Priority

Answer: D

6. Why is it beneficial to make use of Enhanced LMI (ELMI) on Cisco networks?
A. ELMI is responsible for providing virtual provisioning tools at the edge of the Frame Relay network.
B. ELMI permits routers to dynamically download QoS information from Cisco switches for use in traffic shaping or for congestion management purposes.
C. ELMI provides the router the ability to use additional QoS tools including rate limiting with CAR and the Modular QoS Command Line Interface (MQC).
D. ELMI allows the router to deliver packets at the line rate of the Frame Relay interface, regardless of the condition of the Frame Relay network.

Answer: B

7. Which of the following statements are true when you compare DSCP and IP Precedence to each other? (Choose all that apply.)
A. DSCP is backwards compatible with IP Precedence.
B. DSCP cannot be easily mapped into QoS because of its expanded classification options.
C. DSCP is more granular the IP Precedence, since more marking combinations are available.
D. DSCP appears stubby when compared IP Precedence, since devices make use of DSCP as defined in RFC exclusively.
E. DSCP is 6 bits long and IP Precedence is 3 bits long.
F. DSCP is more restrictive than IP Precedence, since devices are only allowed to use DSCP as defined in RFCs.

Answer: ACE

8. Which MQC command would you use to perform marking properly?
A. precedence 5
B. ip precedence 5
C. set ip precedence 5
D. set ip mark precedence 5
E. mark ip precedence 5

Answer: C

9. Which of the following statements aptly describes a network well designed for QoS?
A. Packets are classified at each router, based on as many detail as possible, typically using extended IP ACLs to match the packets for classification.
B. Packets are classified at each router, based on socket address only, typically using extended IP ACLs to match the packets for classification.
C. Packets are classified and marked, close to the edge of the network. The packets are treated differently based on this marking at the routers in the middle of the network.
D. Packets are classified based on different parameters, but close to the edge of the network. The packets are automatically characterized based on flow at the routers.
E. Packets are classified based on socket address, at the router closest to the source of the traffic. The packets are automatically characterized based on flow at the routers.

Answer: C

10. The newly appointed PassGuide trainee technician wants to know which bit in the ATM header can be marked by the Class Based Marker to extend IP QoS policy into an ATM network. What will your reply be?
A. DE
B. PTI
C. FECN
D. CLP
E. BECN

Answer: D

11. How many possible meaningful values are defined in the DSCP in a Differentiated Services environment?
A. 3
B. 8
C. 16
D. 32
E. 64
F. 128

Answer: E

12. Which of the following features will allow the marking of packets according to the Cisco QoS Framework? (Choose all that apply.)
A. MQC
B. CQ
C. PQ
D. CAR
E. WRED

Answer: AD

13. Which of the following can be classified as Call Admission Control methods? (Choose all that apply.)
A. GTS
B. Advanced Busyout Monitor
C. RSVP
D. NBAR
E. Max Connections
F. AVBO.

Answer: CEF

14. What are the benefits, as listed in the DQOS course, for Enterprise Networks when QoS is implemented? (Choose all that apply.)
A. It decreases propagation delay.
B. It provides predictable response times.
C. It prevents the need to increase bandwidth.
D. It supports dedicated bandwidth per application.
E. It maximizes loss during bursty congestion.

Answer: BD

15. Which of the following is most likely to occur for voice in the absence of QoS? (Choose all that apply.)
A. choppy speech
B. words out of order due to recovery
C. disconnect calls
D. unsynchronized voice patterns
E. softer volume speech

Answer: AC

16. Auto QoS is which type of Cisco IOS command?
A. interface
B. global
C. policy-map
D. service-map
E. serial interface only

Answer: A

17. Which two components are associated with the DiffServ model? (Choose two.)
A. hop-by-hop signaling
B. per-hop behavior
C. RSVP
D. Hard QoS
E. DSCP use of class selector

Answer: BE

18. What is true about a DSCP marked packet when it reaches an IP precedence based device?
A. The eight DSCP bits are all set to zero.
B. The last three bits of the DSCP are set to 101.
C. The 8 DSCP AF classes will be mapped into the 8 levels of IP precedence.
D. Bits 7-5 of DSCP have the same position and meaning as IP precedence.

Answer: D

19. SIMULATION Simulation Exhibit:

You are working as a network administrator at PassGuide.com. You are required to configure the PassGuide 1 WAN edge router: you must configure the appropriate MQC based queuing mechanism for the outbound traffic to the WAN (S0/0) so that the following bandwidth requirements will be met. A strict priority queue with a 168 Kbps bandwidth guarantee for the class voice is reserved, a minimum bandwidth guarantee of 30 Kbps is configured for the class interactive, a minimum bandwidth guarantee of 16 Kbps for class bulk, and the default class is configured for WFQ with no bandwidth guarantee. In addition, also limit the bulk traffic class to an average rate of 24 Kbps by buffering excess traffic (use the IOS default Bc and Be). In addition, also limit the bulk traffic class to an average rate of 24 Kbps by buffering excess traffic (use the IOS default Bc and Be).
Use a policy-map called “IIq-policy” and reference the existing class-maps already configured on the PassGuide 1 router. Traffic Class Name Bandwidth Guarantee voice 168 Kbps maximum (use the IOS default burst value) interactive 30 Kbps minimum bulk 16 Kbps minimum (For the bulk traffic class, also limit the traffic to an average rate of 24 Kbps by buffering excess traffic (use the IOS default Bc and Be)) class-default Weighted Fair Queue with no bandwidth guarantee

Simulation Output exhibit #2.

Answer:

PassGuide 1(config)#policy-map llq-policy
PassGuide 1(config-pmap)#class voice
PassGuide 1(config-pmap-c)#priority 168
PassGuide 1(config-pmap-c)#class interactive
PassGuide 1(config-pmap-c)#bandwidth 30
PassGuide 1(config-pmap-c)#class bulk
PassGuide 1(config-pmap-c)#bandwidth 16
PassGuide 1(config-pmap-c)#shape average 2400
PassGuide 1(config-pmap-c)#class class-default
PassGuide 1(config-pmap-c)#fair-queue
PassGuide 1(config-pmap-c)#interface serial 0/0
PassGuide 1(config-if)#service-policy output llq-policy
PassGuide 1(config-if)#end
PassGuide 1#copy running-config startup-config

20. Command exhibit: mis qos trust pass-through dscp Your apprentice PassGuide is configuring a Catalyst 2950 Switch. What is the purpose of the command she is submitting (see exhibit)?
A. The command configures a port to trust the incoming CoS and not modify the incoming DSCP when sending the frame out.
B. The command configures a port to trust the incoming CoS and to generate the internal DSCP based on the incoming CoS. The internalr DSCP will then determine the gress DSCP.
C. The command configures a port to trust the incoming CoS and DSCP values.
D. The command configures a port to trust the incoming CoS and to generate the internal DSCP based on the incoming DSCP. The internal DSCP will then determine the egress DSCP.
E. The command configures a port to trust the incoming CoS and bypass the CoS-to-DSCP maps for generating the internal DSCP.
F. The command configures a port to trust the incoming CoS and bypass the DSCP-to-CoS maps for generating the egress CoS.

Answer: A

21. Which of the following tasks are necessary when configuring Service Assurance Agent (SAA agent)? (Choose all that apply.)
A. You must schedule the operation
B. You must configure the data collection frequency
C. You must configure the operation type
D. You must configure a collection probe on the router
E. You must configure timer parameters for the SAA agent

Answer: AC

22. The SSA agent is used to measure which of the following SLA metrics? (Choose all that apply.)
A. jitter
B. interface utilization
C. packet loss
D. response time
E. client response
F. router buffer allocation

Answer: ACD

23. Which of the following is part of SMS? (Choose all that apply.)
A. QDM
B. CiscoWorks2000 Resource Manager Essentials
C. RSVP COPS Server
D. Service Level Manager
E. CiscoViewCiscoWorks 2000 Management Server
F. All of the above

Answer: BDE

24. You are using IP to ATM CoS. Which action can be configured to be automatically taken should a VC in a VC bundle fail?
A. The VC can be remapped to a different bundle.
B. The VC can be declared down and an alternate route requested.
C. The circuit data can be transferred or “bumped” to a lower priority VC.
D. The circuit data can be divided equally between the remaining VCs in the bundle.

Answer: C

25. How is IP to ATM CoS supported in a single VC?
A. The IP Precedence bits are mapped into the unused upper bits of the VPI field.
They are treated accordingly as they are switched through the ATM network.
B. The router at the edge of the ATM network sets the ATM CLP based on the IP Precedence bits.
Lower priority packets are transported in lower priority cells.
They are treated accordingly as they are switched through the ATM network.
C. WRED/DWRED is used in the routers at the edge of the ATM network.
Based on the IP Precedence bits, IP traffic is subjected to different drop probabilities (and therefore priorities) as IP traffic coming into a router competes for bandwidth on the ATM VC.
D. PQ-WFQ is used in the routers at the edge of the ATM network.
Based on the IP Precedence bits, IP traffic is then properly queued and de-queued as IP traffic competes for bandwidth on the ATM VC.

Answer: C

26. You are the network administrator at PassGuide . The newly appointed PassGuide trainee wants to know which LFI mechanism has an option for fragmentation by the Frame Relay DTE, with the switch reassembling the fragments. What will your reply be?
A. FRF .3
B. FRF .9
C. FRF .11 Annex C
D. FRF.12
E. FRF.6

Answer: D

27. Which of the following statements are valid when considering the need for link efficiency tools such as fragmentation and compression? (Choose all that apply.)
A. Fragmentation allows voice CAC mechanism to increase call volume.
B. While adding bandwidth to counter congestion, reducing load on a link by compression increases available bandwidth.
C. Variable sized packets create extra processing overhead for most IOS queuing mechanism, but fragmentation creates uniformity, thus decreasing queuing delay.
D. Based on link speed, some single packets are large enough that their serialization delay causes intolerable delay for voice or video.
E. All of the above.

Answer: BD

Answer: ABD

172. The CIO of PassGuide wants to know what allows the Differential Services model to be scaled to large networking environments. What will your reply be?
A. Differential services are accomplished through hop-by-hop application signaling.
B. The Differentiated Services model scales by providing per-flow state visibility to the core of the network.
C. Policing is not utilized in the Differentiated Services model providing to facilitate efficient expediting of high priority traffic flows.
D. It achieves scalability by implementing complex classification and conditioning requirements only at network boundary nodes.
E. In the Differentiated Services model, an explicit setup mechanism predefines all QoS parameters for the packet before it is transmitted.

Answer: D

173. At the network layer, IP packets are typically classified based on which three items? (Choose three.)
A. packet length
B. VLAN Identifier
C. flow control bits
D. source and destination IP addresses
E. content of the ToS byte

Answer: ADE

174. Which of the following are types of scheduling used by Cisco QoS features? (Choose all that apply.)
A. Round robin
B. Modified linear
C. Strict priority
D. Fair weighted
E. Weighted Random Early Detection (WRED)

Answer: ACD

175. What is the default number of classes that Assured Forwarding (AF) have?
A. 1
B. 3
C. 4
D. 6
E. 8

Answer: C

176. Exhibit:

Central site router A has a single access link, which is a 512 Kbps link, with PVCs of CIR 256 K to each of three remote routers, namely routerB, routerC, and routerD. RouterB’s output utilization on the PVC to routerA never exceeds an average of 100 Kbps. You have verified that it never even approaches 256 Kbps, even during short burts. Which two statements are true about fragmentation? (Choose two)
A. Since there is never congestion, there is no need for fragmentation.
B. The Frame Relay network inherently deals with congestion therefore no fragmentation is required,
C. There still may be large packets leaving routerB, so fragmentation may be beneficial to overcome serialization delay.
D. Congestion delay called “Egress Blocking” could occur for frames leaving the Frame Relay network, heading for routerA, so fragmentation at all the remote routers might help some frames to be interspersed.

Answer: CD

177. For very low-speed links (those with a link speed less than 768 K), it is necessary to use techniques that provide link fragmentation and interleaving of packets. This prevents voice traffic from being delayed behind large data frames and hence bounds jitter. What are two techniques that exist for this?
A. LECS for ATM links.
B. Multilink PPP (MLP) for Serial links.
C. FRF.12 for Frame Relay.
D. 1png for DSL links.

Answer: BC

178. Exhibit:

PC1 sends a packet to R1. R1 forwards to R2, then R3, and finally R3 forwards the packet to the destination, PC2. R1 marks the packet with IP Precedence 3. Which statement is true?
A. When classifying packets at Layer 3, only Layer 3 IP Precedence marking can be used.
B. R2 and R3 can perform QoS features that ignore the marked IP Precedence field in the packet.
C. R2 and R3 can only perform QoS features based on the IP Precedence field, since the packet had already been marked.
D. R2 can apply QoS features to the packet, and R3 can on ingress, but R3 cannot apply QoS features to the packet as it exists the Ethernet port on which PC2 resides.

Answer: B

179. From the list below, what is the most important piece to implement if you are considering a VoIP infrastructure?
A. Reinstallation of the PBX.
B. QoS
C. PSTN Regeneration costs.
D. POTS installation documentation.
E. A new Help Desk trained on Voice technologies.

Answer: B

180. Which tool from the list below can be applied to the Campus Switches to help eliminate traffic congestion?
A. QoS
B. LMI
C. PIM
D. DVRMP
E. CDP
F. RDP

Answer: A

181. Command exhibit: qos pre-classify Your PassGuide .com trainee Sandra asks you what the purpose of the command displayed in the exhibit is.
A. To enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header.
B. To enable the IOS to copy the ToS field from the outer tunnel IP header to the outer tunnel IP header.
C. To enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header.
D. To enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP header.
E. to enable class-based marking on tunnel interface
F. to enable class-based marking on IPSec crypto maps

Answer: C

Code:
http://www.4shared.com/file/133507711/dab01775/CBT_Nuggets_Ccvp_642-642_Qospart1.html
http://www.4shared.com/file/133511479/987cf0f4/CBT_Nuggets_Ccvp_642-642_Qospart2.html

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“CCIP Quality of Service (QoS)”, also known as 642-642 exam, is a Cisco certification. With the complete collection of questions and answers, Pass4sure has assembled to take you through 182 Q&As to your 642-642 Exam preparation. In the 642-642 exam resources, you will cover every field and category in CCIP helping to ready you for your successful Cisco Certification.

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Exam DetailsThe QOS exam is one of the qualifying exams for the Cisco Certified Internetwork Professional, Cisco Certified Voice Professional, Cisco IP Telephony Design Specialist, Cisco IP Telephony Express Specialist, Cisco IP Telephony Operations Specialist, and Cisco IP Telephony Support Specialist certifications. The QOS 642-642 exam will test materials covered under the Implementing Cisco Quality of Service QOS v2.1 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 Service Provider and Enterprise environments. The exam covers topics on IP QOS, classification and marking Mechanisms, queuing mechanisms, traffic shaping and policing mechanisms, congestion avoidance mechanisms, link efficiency mechanisms, modular QOS command line interface, and QOS Best Practices.
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The 642-642 exam measures the knowledge and skills necessary to configure and troubleshoot Cisco IOS routers running Quality of Service protocols in Service Provider and Enterprise environments. The exam covers topics on IP QOS, classification and marking mechanisms, queuing mechanisms, traffic shaping and policing mechanisms, congestion avoidance mechanisms, link efficiency mechanisms, modular QOS command line interface, and QOS Best Practices.

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Related Certifications: CCIP, CCVP, IP Telephony Specialists Certifications.

Number of Questions: 45-55 Duration: 90 minutes

Exam Topics Include:

* IP QoS Fundamentals and Best Practices
* IP QoS Components
* Modular QoS CLI and Auto-QoS
* Classification and Marking
* Congestion Management and Avoidance Methods
* Traffic Policing and Shaping
* Link Efficiency Mechanisms

The QOS exam is one of the qualifying exams for the Cisco Certified Internetwork Professional, Cisco Certified Voice Professional, Cisco IP Telephony Design Specialist, Cisco IP Telephony Express Specialist, Cisco IP Telephony Operations Specialist, and Cisco IP Telephony Support Specialist certifications. 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 Service Provider and Enterprise environments. The importance of this exam is evident in the fact that it applies to so many different certifications.

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QUESTION 1
Which of the following markers can be set by Committed Access Rate (CAR)? (Choose all
that apply.)
A. DSCP bits
B. QoS Group
C. ATM CLP bit
D. Frame Relay DE bit
E. IP precedence bits
Answer: A, B, E

What makes the DiffServ model more scalable than the IntServ model? (Choose all that
apply.)
A. DiffServ makes use of per-aggregate QoS instead of per-flow QoS.
B. DiffServ makes use of hop-by-hop signaling which allows DiffServ to scale to a larger
number of application flows.
C. DiffServ is capable of implementing admission control either locally on the routers or be
offloaded to a central policy server using the COPS protocol.
D. DiffServ routers are not compelled to track the state information for each individual flow.
Answer: A, D
The newly appointed Chinatag trainee technician wants to know what the benefits of
using traffic shaping to implement network rate limiting is.What will your reply be?
(Choose all that apply.)
A. Traffic shaping is an effective tool for rate-limiting VoIP traffic. B.
It will not increase packet loss.
C. It will not add to packet transit delays.
D. Traffic shaping can interact with congestion mechanisms embedded in Frame Relay. E.
Traffic shaping can be used on inbound and outbound traffic on a router.
Answer: B, D
Incorrect:
A. Shaping adds variable delay to traffic, possibly causing jitter C.
A shaper typically delays excess traffic using a buffer
E. This is a feature of policing
Study the Exhibit below carefully:
Router# show interfaces hssi 0/0/0 rate-limit
Hssi0/0/0 45Mbps to R1
Input
matches: all traffic
params: 20000000 bps, 24000 limit, 24000 extended limit
conformed 8 packets, 428 bytes; action: transmit
exceed 0 packets, 0 bytes; action: drop
last packet: 8680ms ago, current burst: 0 bytes
last cleared 00:03:59 ago, conformed 0 bps, exceed 0 bps
Output
matches: all traffic
params: 20000000 bps, 24000 limit, 24000 extended limit
conformed 0 packets, 0 bytes; action: transmit
exceed 0 packets, 0 bytes; action; drop
last packet: 8680ms ago, current burst: 0 bytes
last cleared 00:03:59 ago, conformed 0 bps, exceed 0 bps
According to the exhibit, the router has been configured with Committed Access
Rate (CAR) to rate limit traffic.
What data rate has the traffic been limited to?
A. 192 Kbps
B. 2400 Kbps
C. 4,5 Mbps
D. 20 Mbps
E. 40 Mbps
Answer: D
The newly appointed Chinatag trainee technician wants to know which type of software
queuing mechanism is Frame Relay Traffic Shaping implemented with on the physical
interface. What will your reply be?
A. Priority Queuing (PQ)
B. Custom Queuing (CQ)
C. FIFO
D. Weighted Fair Queuing (WFQ)
E. IP Real Time Transport Protocol (RTP) Priority
Answer: D
Why is it beneficial to make use of Enhanced LMI (ELMI) on Cisco networks?
A. ELMI is responsible for providing virtual provisioning tools at the edge of the Frame
Relay network.
B. ELMI permits routers to dynamically download QoS information from Cisco switches for
use in traffic shaping or for congestion management purposes.
C. ELMI provides the router the ability to use additional QoS tools including rate limiting
with CAR and the Modular QoS Command Line Interface (MQC).
D. ELMI allows the router to deliver packets at the line rate of the Frame Relay interface,
regardless of the condition of the Frame Relay network.
Answer: B
Which of the following statements are true when you compare DSCP and IP
Precedence to each other? (Choose all that apply.)
A. DSCP is backwards compatible with IP Precedence.
B.
DSCP cannot be easily mapped into QoS because of its expanded classification options. C.
DSCP is more granular the IP Precedence, since more marking combinations are available.
D. DSCP appears stubby when compared IP Precedence, since devices make use of
DSCP as defined in RFC exclusively.
E. DSCP is 6 bits long and IP Precedence is 3 bits long.
F. DSCP is more restrictive than IP Precedence, since devices are only allowed to use
DSCP as defined in RFCs.
Answer: A, C, E
Explanation:
A)DSCP is backward compatible with IP Precedence (Class Selector Code point, RFC
1812) but not with the ToS byte definition from RFC 791 (”DTR” bits)
Reference: Introduction to IP QoS (Course) p.45
Which MQC command would you use to perform marking properly?
A. precedence 5
B. ip precedence 5
C. set ip precedence 5
D. set ip mark precedence 5
E. mark ip precedence 5
Answer: C
Explanation:
IP precedence is encoded into the three high-order bits of the ToS field in the IP header. It
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Are you ready to take the QOS, CVOICE, or CIPT exam for the Cisco IP Telephony certification? You learned the concepts, you have the experience to put them into real-world use, and now you want to practice, practice, practice until exam time. Cisco IP Telephony Flash Cards and Exam Practice Pack gives you three methods of proven, late-stage Cisco IP Telephony exam preparation in one package.

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Cisco IP Telephony Flash Cards and Exam Practice Pack is part of a recommended learning path from Cisco Systems that includes simulation and hands-on training from authorized Cisco Learning Partners and self-study products from Cisco Press. To find out more about instructor-led training, e-learning, and hands-on instruction offered by authorized Cisco Learning Partners worldwide, please visit www.cisco.com/go/authorizedtraining.

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The networks of yesteryear physically separated voice, video, and data traffic. Literally, these traffic types flowed over separate media (for example, leased lines or fiber-optic cable plants). Today, however, network designers are leveraging the power of the data network to transmit voice and video, thus achieving significant cost savings by reducing equipment, maintenance, and even staffing costs.

The challenge, however, with today’s converged networks is that multiple applications are contending for bandwidth, and some applications such as, voice can be more intolerant of delay (that is, latency) than other applications such as, an FTP file transfer. A lack of bandwidth is the overshadowing issue for most quality problems.

When a lack of bandwidth exists, packets can suffer from one or more of the following symptoms:

*

Delay—Delay is the time that is required for a packet to travel from its source to its destination. You might witness delay on the evening news, when the news anchor is talking through satellite to a foreign news correspondent. Because of the satellite delay, the conversation begins to feel unnatural.
*

Jitter—Jitter is the uneven arrival of packets. For example, consider that in a Voice over IP (VoIP) conversation, packet 1 arrives. Then, 20 ms later, packet 2 arrives. After another 70 ms, packet 3 arrives, and then packet 4 arrives 20 ms behind packet 3. This variation in arrival times (that is, variable delay) is not dropping packets, but this jitter can be interpreted by the listener as dropped packets.
*

Drops—Packet drops occur when a link is congested and a buffer overflows. Some types of traffic, such as User Datagram Protocol (UDP) traffic (for example, voice), are not retransmitted if packets are dropped.

Fortunately, quality of service (QoS) features that are available on Cisco routers and switches can recognize your “important” traffic and then treat that traffic in a special way. For example, you might want to allocate 128 kbps of bandwidth for your VoIP traffic and also give that traffic priority treatment.

Consider water that is flowing through a series of pipes with varying diameters. The water’s flow rate through those pipes is limited to the water’s flow rate through the pipe with the smallest diameter. Similarly, as a packet travels from its source to its destination, its effective bandwidth is the bandwidth of the slowest link along that path.

Figure 1Figure 1

Because your primary challenge is a lack of bandwidth, the logical question is, “How do you increase available bandwidth?” A knee-jerk response to that question is often, “Add more bandwidth.” Although adding more bandwidth is the best solution, it comes at a relatively high cost.

Compare your network to a highway system in a large city. During rush hour, the lanes of the highway are congested, but the lanes can be underutilized during other periods of the day. Instead of just building more lanes to accommodate peak traffic rates, the highway engineers add carpool lanes. Cars with two or more riders can use the reserved carpool lane. These cars have a higher priority on the highway. Similarly, you can use QoS features to give your mission-critical applications higher-priority treatment in times of network congestion.

Some of the QoS features that can address issues of delay, jitter, and packet loss include the following:

*

Queuing—Queuing can send higher-priority traffic ahead of lower-priority traffic and make specific amounts of bandwidth available for those traffic types. Examples of queuing strategies that you consider later in these Quick Reference Sheets include the following:
o

Priority Queuing (PQ)
o

Custom Queuing (CQ)
o

Modified Deficit Round Robin (MDRR) queuing
o

Weighted Fair Queuing (WFQ)
o

Class-Based WFQ (CB-WFQ)
o

Low Latency Queuing (LLQ)
*

Compression—By compressing a packet’s header or payload, fewer bits are sent across the link. This effectively gives you more bandwidth.

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