Testinside cisco CCNP 642-845

ONT – Optimizing Converged Cisco Networks : 642-845 Exam

642-845 ONT
Optimizing Converged Cisco Networks

Exam Number: 642-845
Associated Certifications: CCNP
Duration: 90 minutes
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
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.

Exam Topics
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.

“Optimizing Converged Cisco Networks”, also known as 642-845 exam, is a Cisco certification.
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QUESTION 21:
Two Certkiller locations are using a multi-site centralized call processing model. The
voice gateway on the remote branch has lost IP connectivity to its Cisco
CallManager server. Which feature enables the remote gateway to take the role of
the call agent during the WAN failure?
A. Cisco CallManager Attendant Console
B. Automated alternate routing (AAR)
C. Real-Time Protocol (RTP)
D. Survivable Remote Site Telephony (SRST)
E. None of the above
Answer: D
Explanation:
In IP telephony environments, gateways support fallback scenarios for IP phones that
have lost IP connectivity to their call agent (that is, Cisco Unified CallManager). This
feature, called Cisco Survivable Remote Site Telephony (SRST), enables the gateway to
take the role of the call agent during WAN failure. Local calls can then proceed even if
IP connectivity to Cisco Unified CallManager is broken. In addition, Cisco SRST can
route calls out to the PSTN and, thus, use the PSTN as the backup route for calls toward
any site that is not reachable via IP.

QUESTION 22:
A Cisco router is being used as a VOIP gateway to convert voice signals in the
Certkiller network. When a router converts analog signals to digital signals, what
three steps are always included in the process? (Select three)
A. Compression
B. Involution
C. Quantization
D. Encoding
E. Sampling
F. Companding
Answer: C, D, E
Explanation:
Step 1 Sampling: The analog signal is sampled periodically. The output of the sampling
is a pulse amplitude modulation (PAM) signal.
Step 2 Quantization: The PAM signal is matched to a segmented scale. This scale
measures the amplitude (height) of the PAM signal.
Step 3 Encoding: The matched scale value is represented in binary format.
Step 4 Compression: Optionally, voice samples can be compressed to reduce bandwidth
requirements. Analog-to-digital conversion is done by digital signal processors (DSPs),
which are located on the voice interface cards. The conversion is needed for calls
received on analog lines, which are then sent out to a packet network or to a digital voice
interface.
QUESTION 23:
The Certkiller network has offices around the country. With the use of Cisco Unified
CallManager, Certkiller has deployed a VoIP network in a multisite centralized
configuration. Which IOS gateway feature should be deployed to enable VoIP
devices to register with a local gateway and continue to function when the
connection to the Cisco Unified CallManager is broken?
A. Automatic Alternate Routing (AAR)
B. Gatekeeper multizone
C. Call Admission Control (CAC)
D. Survivable Remote Site Telephony (SRST)
E. None of the above
Answer: D

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