Exam 642-845 Preparation Questions

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Exam 642-845: ONT - Optimizing Converged Cisco Networks

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Question:1 Which DSCP value will the Branch router apply to voice traffic destined for the Central from the IP Phone on the local network? A. 46 (ef) B. 48 (vs6) C. 50 D. 56 (cs7) E. 70

Answer: A Question:2 Which DSCP value will the Branch router apply to voice traffic destined for the IP Phone on the local network from the Central site? A. 46 (ef) B. 48 (cs6) C. 50 D. 56 (cs7) E. 70

Answer: B Question:3 Which QoS model has been implemented on the Branch router by the SDM wizard for the various expected traffic types?

A. Best Effort B. IntServ


C. DiffServ D. Priority Queuing Answer: C Question:4 During periods of congestion which queuing method will be applied to outbound traffic on the Serial0/3/0 interface? A. Low Latency Queuing B. Class-based Weighted Fair Queuing C. Weighted Round Robin D. Round Robin E. No queuing is applied to outbound traffic on this interface. Answer: A Case Study# 2

Scenario: Law Solutions, Inc. is a large, worldwide law firm. Using the AutoQoS feature of IOS, the company recently implemented QoS policies at one of their Branch locations. As a recent addition to the network engineering team, you have been tasked with documenting the active QoS configuration at the branch router. Additionally, the firm is experiencing poor video quality with newly installed video-conferencing equipment. The video problems at the branch location seem to occur only during peak hours when some network congestion is expected. Output:







Topology:

Using the show run output of the branch router, answer the following questions:


Case Study# 2 (Questions) Question:5 Which DSCP value will the Branch router apply to video traffic destined for the Central site from the video equipment on the local network? A. 8 (cs1) B. 10 (af11) C. 18 (af21) D. 24 (cs3) E. 46 (ef) F. no value

Answer: E Question:6 Which two statements most accurately identify what has caused the occasional poor video quality experienced by the Law Solutions, Inc.? (Choose two.) A. Insufficient bandwidth is creating a bottleneck transiting from the FastEthernet0/0 to the Serial0/3/0 interface. B. Auto-Discovery did not have an opportunity to detect the video traffic. C. AutoQoS was implemented on the incorrect interface D. A policy matching DSCP value 46 (ef) was not applied on the outbound interface.

Answer: B, D Question:7 Which QoS model has been implemented on the Branch router by Auto QoS for the various expected traffic types? A. Best Effort B. IntServ C. DiffServ D. Priority Queuing

Answer: C Question:8 During periods of congestion, how has AutoQoS configured the router to facilitate outbound video traffic on the Serial0/3/0 interface? A. Video traffic will be associated with the priority queue by using a DSCP value of 46 (ef). B. Video traffic will be associated with the AutoQoS-Signaling-Se0/3/0 class and its related policy through use of the

H.323 protocol. C. Video traffic will only be queued on the local FastEthernet0/0 interface using a DSCP value of 46 (ef). D. Video traffic will be associated with the “class-default” and use WFQ.

Answer: D Question:9 Network topology exhibit: You are a network technician at Pass4sure.com, examine the exhibit carefully. You need to finalize the configuration of router P4S-R in this scenario. In particular you should decide which interface types can be used for connecting router P4S-R to the phone and fax respective ely. (Choose two.)

A. Connect the analog phone to an FXS port. B. Connect the fax to an FXS port. C. Connect the fax to an FXO port. D. Connect the analog phone to an FXO port.


Answer: A, B Case Study# 3 Scenario: Ferrous Plastics,Inc.is a medium sized company,with two locations connected through a serial WAN link.The WAN routers should be configured to only see NBAR to classify traffic interface Fa0/1 prior to using low latency queuing on the outgoing interface s0/1/0.Recently configuration changes were made to the inter-connecting routers WAN-R1 and WAN-R2.The company is now experiencing QoS related problems which they believe are associated with these changes. Router WAN-R2 is not marking traffic correctly on Fa0/1 based on NBAR classification.Which of the following is correct? Topology: Case Study# 3 (Questions)

Questions: 1 Router WAN-R2 is not marking traffic correctly on Fa0/1 based on NBAR classification.Which of the following is correct? A. Protocol discovery is applied to the incorrect interface. B. CEF is not configured. C. The service-policy is applied in the wrong direction. D. The service-policy configured on interface Fa0/1 should be policy.

Answer: D Question:10 The network administrator has asked how FTP traffic is being classified on router WAN R1.Which of the following is correct? A. FTP traffic is marked correctly,but no other active protocols are marked correctly. B. FTP traffic is marked correctly based on NBAR classification. C. FTP traffic is marked correctly,but is not using NBAR for classification. D. FTP traffic is not marked correctly based on NBAR classification as protocol discovery is applied to the incorrect

interface.


Answer: C Question:11 On router WAN-R1,which protocol is being marked as af21? A. CITRIX B. Exchange C. FTP D. HTTP E. SQLNET Answer: E Question:12 On rouoter WAN-R1,which protocol is being classified as mission critical? A. CITRIX B. Exchange C. FTP D. HTTP E. SQLNET Answer: A

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