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Exam Number/Code: 642-845
Exam Name: ONT – Optimizing Converged Cisco Networks
VUE Code: 642-845
Questions Type: Multiple choice,
Exam Language(s): English

“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 166 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.

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.
642-845 ONT
Optimizing Converged Cisco Networks
Exam Number: 642-845
Associated Certifications: CCNP
Duration: 90 minutes
Available Languages: English
Click Here to Register: Pearson VUE
Exam Policies: Read current policies and requirements
Exam Tutorial: Review type of exam questions

Exam Description Exam Topics Recommended Training Additional Resources
Exam Description

The following information provides general guidelines for the content likely to be included on the exam. However, other related topics may also appear on any specific delivery of the exam. In order to better reflect the contents of the exam and for clarity purposes the guidelines below may change at any time without notice.
Describe Cisco VoIP implementations.

* Describe the functions and operations of a VoIP network (e.g., packetization, bandwidth considerations, CAC, etc.).
* Describe and identify basic voice components in an enterprise network (e.g. Gatekeepers, Gateways, etc.)

Describe QoS considerations.

* Explain the necessity of QoS in converged networks (e.g., bandwidth, delay, loss, etc.).
* Describe strategies for QoS implementations (e.g. QoS Policy, QoS Models, etc.).

Describe DiffServ QoS implementations.

* Describe classification and marking (e.g., CoS, ToS, IP Precedence, DSCP, etc.).
* Describe and configure NBAR for classification.
* Explain congestion management and avoidance mechanisms (e.g., FIFO, PQ, WRR, WRED, etc.).
* Describe traffic policing and traffic shaping (i.e., traffic conditioners).
* Describe Control Plane Policing.
* Describe WAN link efficiency mechanisms (e.g., Payload/Header Compression, MLP with interleaving, etc.).
* Describe and configure QoS Pre-Classify.

Implement AutoQoS.

* Explain the functions and operations of AutoQoS.
* Describe the SDM QoS Wizard.
* Configure, verify, and torubleshoot AutoQoS implementations (i.e., MQC).

Implement WLAN security and management.

* Describe and Configure wireless security on Cisco Clients and APs (e.g., SSID, WEP, LEAP, etc.).
* Describe basic wireless management (e.g., WLSE and WCS). Configure and verify basic WCS configuration (i.e., login, add/review controller/AP status, security, and import/review maps).
* Describe and configure WLAN QoS.

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QUESTION 30:
A Cisco router acts as a voice gateway in the Certkiller network, converting digital
to analog signals. Which statement is true about the digital to analog conversion
process?
A. The two steps of digital to analog conversion are quantization and decoding.
B. The two steps of digital to analog conversion are decoding and filtering.
C. The two steps of digital to analog conversion are decompression and reconstruction of
the analog signal.
D. The two steps of digital to analog conversion are decompression and filtering of the
analog signal.
E. None of the above
Answer: C
Explanation:
Digital-to-analog conversion steps include these steps:
1. Decompression: If the voice signal was compressed by the sender, it is first
decompressed.
2. Decoding: The received, binary formatted voice samples are decoded to the amplitude
value of the samples. This information is used to rebuild a PAM signal of the original
amplitude.
3. Reconstruction of the analog signal: The PAM signal is passed through a properly
designed filter that reconstructs the original analog wave form from its digitally coded
counterpart. The whole process is simply the reverse of the analog-to-digital conversion.
Like analog-to-digital conversion, digital-to-analog conversion is performed by DSPs,
which are located on the voice interface cards. The conversion is needed for calls being
received from a packet network or digital interfaces, which are then transmitted out an
analog voice interface.
QUESTION 31:
You want to use a Cisco router to handle all IP calls locally in a Certkiller office.
Which functionality in the Cisco IOS software will enable a router to permanently
act as a call agent for IP phones?
A. Media Gateway Control Protocol (MGCP)
B. Cisco CallManager Gateway (CMG)
C. Cisco CallManager Voice Gateway (CMVG)
D. Cisco CallManager Express (CME)
E. Cisco CallManager
F. None of the above
Answer: D
Explanation:
Cisco Unified CallManager is the IP-based PBX in an IP telephony solution. It acts as a
call agent for IP phones and MGCP gateways and can also interact with H.323 or SIP
devices using their protocols. For redundancy and load sharing, multiple Cisco Unified
CallManager servers operate in a cluster. From an administration perspective, the whole
cluster is a single logical instance.
Cisco IOS routers can permanently act as a call agent for IP phones. The feature that
provides this functionality is Cisco Unified CallManager Express. With Cisco Unified
CallManager Express, Cisco Unified CallManager functionality is provided by the router.
If the router is also a voice gateway, it combines IP telephony and VoIP gateway
functionality in a single box.
Cisco IOS gateways also support other features, such as call preservation (Real-Time
Transport Protocol [RTP] stream) in case of a lost signaling channel, dual tone
multifrequency (DTMF) relay capabilities, supplementary services support (for user
functions, such as hold, transfer, and conferencing), and fax and modem support.
QUESTION 32:
Router CK1 is being used as a VOIP gateway at a remote Certkiller office. Which
statement is true about the functions provided by a Cisco voice gateway router?
A. ISDN Q signaling is not supported on a voice gateway router.
B. On a voice gateway router, analog signals are converted to digital signals before the
encapsulation occurs.
C. Analog devices cannot be directly connected to a Cisco voice gateway device.
D. Voice gateways always require a call agent to process calls.
E. None of the above.
Answer: B

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