Pass4sure Cisco CCNP ONT 642-845 Exam

ONT - Optimizing Converged Cisco Networks : 642-845 Exam

Exam Number/Code: 642-845
Exam Name: ONT - Optimizing Converged Cisco Networks
VUE Code: 642-845
Questions Type: Multiple choice,

Exam : Cisco 642-­845

Title :

ONT Optimizing Converged Cisco

Update : Demo

1. What best describes an FXO interface?

A. analog trunks that provide the Survivable Remote Site Telephony (SRST) feature

B. analog trunks that provide VoIP gateway functionality

C. analog trunks that connect a gateway to plain old telephone service (POTS) device such as analog phones, fax machines, and legacy voice­mail systems
D. analog trunks that connect a gateway to a central office (CO) or private branch exchange (PBX) Answer: D

2. Which two steps are executed in the deployment of Cisco AutoQoS for Enterprise? (Choose two.)

A. The customer uses SNMP statistics to create the policy.

B. QoS policy templates are generated and installed on the interface. C. RTP is used to generate the policy.
D. LLQ, cRTP, and LFI are used to automatically discover the policy.

E. The auto­generated policy is manually optimized before implementation.

F. Auto­discovery is used to determine what traffic is on the interface. Answer: BF

3. Which two statements are true about the application of QoS in a converged network? (Choose two.)

A. End­to­end network delay times that exceed 50 ms for real­time traffic are considered unacceptable.

B. End­to­end network delay times that exceed 250 ms for real­time traffic are considered unacceptable.

C. End­to­end network delay is not a factor as long as the delay is consistent. D. Some packet loss can be corrected by codec algorithms.
E. RSVP handles voice packet retransmission.

F. Fragmentation is a result of packet loss. Answer: BD

4. What are two of the three predefined classes for the Cisco SDM wizard? (Choose two.)

A. business­critical

B. high priority

C. middle class

D. voice

E. best effort F. scavenger Answer: AE

5. A GRE tunnel is configured between a local and a remote site. Where should the service policy be applied to classify packets based on the pretunnel header?
A. In global configuration mode, apply the service policy and use the qos pre­classify command.

B. In global configuration mode, apply the service policy but do not use the qos pre­classify command.

C. Apply the service policy on the physical interface but do not use the qos pre­classify command.

D. Apply the service policy on the tunnel interface but do not use the qos pre­classify command.

E. Apply the service policy on the tunnel interface and use the qos pre­classify command. Answer: D

6. Which statement is true about the capabilities of a voice gateway router?

A. Voice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packets.
B. Voice gateways need a gatekeeper to interconnect the VoIP networks with the PSTN network.

C. Voice gateways with Cisco Unified CallManager Express (CME) can permanently act as a call agent for IP phones.
D. Voice gateways equipped with a DSP module can take the role of the call agent during WAN failure. Answer: C

7. Refer to the exhibit. What type of interface will connect the voice gateway router R1 to the analog phone and the fax machine?

A. The analog phone will be connected to the FXS port, and the fax machine will be connected to the FXO

port on router R1.

B. The analog phone will be connected to the FXO port, and the fax machine will be connected to the FXS

port on router R1.

C. Both devices will be connected to the FXS ports on router R1. D. Both devices will be connected to the FXO ports on router R1.
E. Both devices will be connected to the E and M ports on router R1.

Answer: C

8. Which statement is true about the configuration of AutoQoS on a Frame Relay interface?

A. AutoQoS can be configured from a different subinterface if the DLCI is already assigned to one subinterface.
B. Multilink PPP (MLP) over Frame Relay must be manually configured on low speed DLCIs.

C. For low­speed Frame Relay DLCIs with Frame Relay­to­ATM Interworking, the AutoQoS cannot be configured if a virtual template is already configured for the DLCI.
D. AutoQoS can be configured on a Frame Relay DLCI only if a map class is attached to the DLCI. Answer: C

9. What are two major sources of delay that can be managed by QoS in voice­enabled networks?

(Choose two.)

A. propagation delay

B. voice packet serialization delay

C. congested egress queues

D. header overhead

E. packets dropped because of CRC errors

Answer: CD

10. Which statement best describes the Cisco 2700 Location Appliance collection of location information for wireless devices?
A. All Wi­Fi devices on the WLAN send directly received signal strength indication (RSSI) information to the Cisco Wireless Location Appliance through SNMP.
B. An AP collects RSSI information which is forwarded to wireless controllers through LWAPP. Wireless controllers forward aggregated RSSI to the location appliance through SNMP.
C. The APs collect received signal strength indication (RSSI) information from all Wi­Fi devices and forward the information to the Cisco Wireless Location Appliance through the LWAPP.
D. The Cisco WLAN controllers bypass the received signal strength indication (RSSI) information from all

Wi­Fi devices to the Cisco Wireless Location Appliance through LWAPP. Answer: B

11. Which two statements about the DiffServ QoS model are true? (Choose two.)

A. DiffServ requires RSVP to set up a path through the network to accommodate the requested QoS.

B. Network traffic is identified by class, and the level of service is chosen for each class.

C. The DiffServ model relies on a fairly simple mechanism to provide QoS over a wide range of equipment.
D. RSVP enables the DiffServ model to provide end­to­end QoS.

E. The DiffServ model is more scalable than the IntServ model.

F. The flow­based approach of the DiffServ model is ideal for large scalable implementations such as the public Internet.
Answer: BE

12. What are two features of WLSE­Express wireless management? (Choose two.)

A. centralized management for autonomous access points

B. centralized management for lightweight access points

C. centralized management that requires an external AAA server

D. centralized management with integrated AAA server

E. integration with the Location Appliance to expand real time tracking to 1500 devices for 30 days

F. integration with the Location Appliance to expand real time tracking to 2500 devices for 30 days

Answer: AD

13. Which three statements are true about the application of QoS models? (Choose three.)

A. The DiffServ model requires applications to signal the network with QoS requirements.

B. The DiffServ model can be used to deliver QoS based upon IP precedence, or source and destination addresses.
C. The DiffServ model requires RSVP.

D. The best effort model is suitable for applications such as file transfer and e­mail

E. The IntServ model requires applications to signal the network with QoS requirements.

F. The IntServ model attempts to deliver a level of service based on the QoS specified by each packet

Answer: BDE

14. Refer to the exhibit. The serial link that connects the two offices has a bandwidth of 128 kbps. What could be done to set aside 64 kbps of bandwidth to transport VoIP traffic over the WAN link?

A. Apply the clock rate 64000 command on both serial interfaces connected to the WAN link.

B. Apply the bandwidth 64 command on both serial interfaces connected to the WAN link.

C. Apply the frame­relay voice­bandwidth 64000 command to enable the QoS Call Admission Control

feature on the serial link.

D. Apply the max­conn 64 command on a perial peer basis on both sides of the serial link.

E. Apply the ip bandwidth­percent eigrp 1 64 command on both sides of the serial link.

F. Apply the auto­cost reference­bandwidth 64 command on both sides of the serial link. Answer: C

15. Which three configuration tasks are required to successfully deploy NBAR to recognize TCP and UDP

stateful protocols? (Choose three.)

A. Over leased lines, use the multilink ppp command to reduce latency and jitter, and to create Distributed

Link Fragmentation and interleaving.

B. Use the service­policy command to attach a traffic flow to an interface on the router.

C. Use the ip rsvp bandwidth command to set a strict upper limit on the bandwidth NBAR uses, and to guarantee admission of any flows.
D. Use the policy­map command to define one or more QoS policies (such as shaping, policing, and so on)

to apply to traffic defined by a class map.

E. Use the random­detect dscp command to modify the default minimum and maximum thresholds for the

DSCP value.

F. Use the class­map command to define one or more traffic classes by specifying the criteria by which traffic is classified.
Answer: BDF

16. What is the most common cause of network congestion?

A. aggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core­layer switches
B. speed mismatches when moving from a low­speed LAN environment to a higher speed WAN

environment

C. flapping Ethernet interfaces caused by misconfigured LAN interfaces

D. flapping serial interfaces caused by misconfigured WAN interfaces

E. speed mismatches when moving from a high­speed LAN environment to a lower speed WAN

environment

Answer: E

17. What are two components of the Cisco Autonomous WLAN solution? (Choose two.) A. WCS
B. WLSE C. WLC D. WDS E. LWAPP
Answer: BD

18. What are three security problems with Wi­Fi Protected Access (WPA)? (Choose three.)

A. WPA is based on the outdated IEEE 802.11i standard.

B. WPA uses RSN, which uses the same base encryption algorithm as RC4.

C. WPA requires a hardware upgrade that may not be supported by all vendors. D. WPA uses TKIP, which uses the same base encryption algorithm as WEP.
E. WPA is susceptible to a DoS attack when it receives two packets in quick succession with bad MICs,

forcing the AP to shut down the entire Basic Service Set (BSS) for one minute.

F. WPA is susceptible to a security weakness when preshared keys are used. Answer: DEF

19. Which three characteristics of the traffic flow are taken into consideration when the QoS­for­VPNs feature (QoS pre­classify) provides packet classification and applies appropriate QoS service on tunnel interfaces? (Choose three.)
A. IP precedence bits

B. DSCP bits

C. original port numbers

D. DE bits

E. source IP address

F. destination IP address

Answer: CEF

20. Which two statements about the Wireless Location Appliance are true? (Choose two.)

A. A Wireless Location Appliance acts as a server to one or more Cisco WCSs. It collects, stores, and passes on data from its associated Cisco WLAN controllers.
B. Before using the Web interface, the initial configuration of the Wireless Location appliance must be

done using the command­line interface (CLI).

C. The Cisco 2000, 2700, 4100, and 4400 are examples of Wireless Location Appliances.

D. The Wireless Location Appliance visually displays the location information of WLAN devices and forwards this information to third­party applications using the Simple Network Management Protocol
(SNMP).

E. The Wireless Location Appliance visually tracks up to 15,000 WLAN devices and can store this information for 90 days.
Answer: AB

21. Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true?

(Choose two.)

A. The SDM QoS wizard will create two real­time traffic classes to handle VoIP and voice signaling packets.
B. The SDM QoS wizard will create three real­time traffic classes to handle VoIP, voice signaling, and

video packets.

C. The SDM QoS wizard will create four real­time traffic classes to handle VoIP, voice signaling, video, and video streaming packets.
D. The SDM QoS wizard will create two business­critical traffic classes to handle transactional and

network management packets.

E. The SDM QoS wizard will create three business­critical traffic classes to handle transactional, network management, and routing packets.
F. The SDM QoS wizard will create four business­critical traffic classes to handle transactional, network

management, routing, and best­effort packets.

Answer: AE

22. What are three traffic descriptors typically used to categorize traffic into different classes? (Choose three.)
A. IP precedence

B. media type

C. DSCP

D. outgoing interface E. incoming interface F. DLCI
Answer: ACE

23. Which two statements about queuing mechanisms are true? (Choose two.) A. FIFO queuing is only appropriate for slower serial interfaces.
B. Weighted fair queuing is the default queuing mechanism used for all but slower than E1 rate interfaces.

C. Only one queuing mechanism type can be applied to an interface.

D. Weighted fair queuing does not require the configuration of access lists to classify traffic.

E. Flow­based weighted fair queuing provides for queues to be serviced in a round­robin fashion. Answer: CD

24. Which two statements are true about the implementation of QoS? (Choose two.) A. Implementing DiffServ involves the configuration of RSVP.
B. Implementing IntServ allows QoS to be performed by configuring only the ingress and egress devices.

C. Implementing IntServ involves the utilization of RSVP.

D. Traffic should be classified and marked by the core network devices.

E. Traffic should be classified and marked as close to the edge of the network as possible. Answer: CE

25. What type of services are provided by the Cisco IOS gateways in a VoIP network with Cisco

CallManger functionality?

A. Cisco IOS gateways provide services such as address translation and network access control for the devices on the network.
B. Cisco IOS gateways provide services such as bandwidth management and accounting.

C. Cisco IOS gateways provide media termination and signal translation between the public switched telephone network (PSTN) and IP networks.
D. Cisco IOS gateways provide zone management for all registered endpoints in the network. Answer: C

26. What accurately describes the usage of a Cisco AutoQoS command?

A. On Catalyst switches, the show auto discovery qos command is used to display the data collected during the Auto­Discovery phase.
B. On Catalyst switches, the show auto qos command is used to display packet statistics of all classes that are configured for all service policies.
C. On Cisco routers, the show mls qos maps command is used to verify the CoS­to­DSCP maps for egress packet queuing.
D. On Cisco routers, the show auto qos command is used to display the AutoQoS interface templates, policy maps, class maps, and ACLs.
Answer: D

27. Refer to the exhibit. A router has a 256 kbps Frame Relay circuit connected to interface serial 0/0. As

a large FTP packet is being placed into the hardware transmit queue of interface serial 0/0, a voice packet

is placed into the priority queue of that interface. How, and in what order, will the packets be transmitted?

A. The voice packet will be transmitted first, followed by the FTP packet in its entirety.

B. The voice packet will be transmitted first, followed by the fragmented FTP packet. C. The FTP packet will be fragmented and the voice packet will be interleaved.
D. The FTP packet will be transmitted first in its entirety, followed by the voice packet. Answer: D

28. Cisco AutoQoS takes the interface type and bandwidth into consideration when configuring which three QoS features? (Choose three.)
A. voice compression methodology

B. LLQ C. cRTP
D. routing protocol

E. LFI

F. trust boundary

Answer: BCE

29. Refer to the exhibit. Both routers have been configured as VoIP gateways. They must also support traditional telephony devices to connect to analog telephones. Which two configuration changes would

correctly support the voice requirements? (Choose two.)

A. On each router, under the dial­peer voice 1 pots configuration, add the port fa0/0 command.

B. On each router, under the dial­peer voice 1 pots configuration, add the port 1/0/0 command.

C. On each router, configure dial­peer voice 1 as a voip connection and configure dial­peer voice 2 as a pots connection.
D. Under the dial­peer voice 1 pots configuration, change the destination pattern of 1111 to 2222 on the

R1 router, and 2222 to 1111 on the R2 router.

E. Under the dial­peer voice 2 voip configuration, change the destination pattern of 1111 to 2222 on the

R1 router, and 2222 to 1111 on the R2 router.

F. Under the dial­peer voice 2 voip configuration, change the destination target address of 10.2.2.2 to

10.1.1.1 on the R1 router, and the destination target address of 10.1.1.1 to 10.2.2.2 on the R2 router. Answer: BE

30. What are three considerations when choosing the QoS model to deploy in a network? (Choose three.)

A. the routing protocols being utilized in the network

B. the applications utilizing the network

C. the traffic destinations

D. network addressing scheme

E. cost of implementation

F. the amount of the control needed of the resources

Answer: BEF

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“ONT - Optimizing Converged Cisco Networks”, also known as 642-845 exam, is a Cisco certification.
Preparing for the 642-845 exam? Searching 642-845 Test Questions, 642-845 Practice Exam, 642-845 Dumps?

With the complete collection of questions and answers, Pass4sure has assembled to take you through 217 Q&As to your 642-845 Exam preparation. In the 642-845 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.
Questions and Answers : 217 Q&As
Updated: May 9th , 2008
Market Price: $129.99
Member Price: $89.99
The Optimizing Converged Cisco Networks (642-845 ONT) is a qualifying exam for the Cisco Certified Network Professional CCNP®. The ONT 642-845 exam will certify that the successful candidate has important knowledge and skills in optimizing and providing effective QOS techniques for converged networks. The exam topics include implementing a VOIP network, implementing QoS on converged networks, specific IP QoS mechanisms for implementing the DiffServ QoS model, AutoQoS, wireless security and basic wireless management.

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