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New Cisco 400-051 Exam Dumps Collection (Question 8 - Question 17)

Q8. To which QoS tool category does compressed RTP belong?

A. classification

B. marking

C. link efficiency

D. queuing

E. prioritization

Answer: C

Explanation:

LLQ is a feature that provides a strict PQ to CBWFQ. LLQ enables a single strict PQ within CBWFQ at the class level.

With LLQ, delay-sensitive data (in the PQ) is dequeued and sent first. ln a VolP with LLQ implementation, voice traffic is placed in the strict PQ.

Q9. Which two are characteristics of jitter buffers? (Choose two.)

A. Jitter buffers are used to change asynchronous packet arrivals into a synchronous stream by turning variable network delays into constant delays at the destination end systems.

B. Jitter buffers are used to change asynchronous packet arrivals into a synchronous stream by turning variable network delays into constant delays at the sending systems.

C. The role of the jitter buffer is to balance the delay and the probability of interrupted playout due to late packets.

D. The role of the jitter buffer is to queue late packets and reorder out-of-order packets.

E. Jitter buffers are used to change asynchronous packet arrivals into a synchronous stream by queuing packets into constant delays at the sending systems.

Answer: A, C

Explanation:

Jitter buffers are used to remove the effects of jitter so that asynchronous packet arrivals are changed to a

synchronous stream. The jitter buffer trades off between delay and the probability of interrupted playout because of late packets (discard).

Reference:

http://www.appneta.com/blog/jitter-voip/

Q10. Which method allows administrators to determine the best match impedance on analog voice ports in Cisco lOS router without having to shut and no shut the ports?

A. THL tone sweep

B. original tone sweep

C. ECAN test

D. inject-tone local sweep

E. remote loop

Answer: A

Explanation:

THL tone sweep allows all available impedances for a single test call to a quiet termination point out to the PSTN. You do not need to manually disable ECAN on the voice port under test. The test feature switches impedances automatically for the tester. The test feature calculates the arithmetic mean ERL and reports the mean for each channel profile at each impedance setting. Then, at the end of the test, the feature specifies the best match impedance setting. This test requires minimal supervision.

Reference:

http://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/64282-impedance-choice.html

Q11. Which statement describes DTMF processing on Cisco Unified Contact Center Express with supported SlP-based agent lP phones that are registered to Cisco Unified Communications Manager?

A. Cisco Unified CCX receives the DTMF digits via SlP NOTlFY messages.

B. Cisco Unified CCX receives the DTMF digits in the RTP payload based on RFC 2833.

C. Cisco Unified CCX receives the DTMF digits via JTAPl messages.

D. Cisco Unified CCX receives the DTMF digits via SlP lNFO messages.

E. Cisco Unified CCX receives the DTMF digits as part of the audio encoding in the RTP stream.

Answer: C

Explanation:

Unified CCX CTl ports are notified of caller-entered digits (DTMF input) via JTAPl messages from Unified CM. Unified CCX does not support any mechanism to detect in-band DTMF digits where DTMF digits are sent with voice packets. Ln deployments with voice gateways or SlP phones that only support in-band DTMF or are configured to use in-band DTMF, an MTP resource must be invoked by Unified CM to convert the in-band DTMF signaling so that Unified CM can notify Unified CCX of the caller-entered digits. Be sure to enable out-of-band DTMF signaling when configuring voice gateways in order to avoid using the previous MTP resources.

Reference:

http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/contact_center/crs/express_9_02/design/guide/UCCX_BK_C39FDB35_00_cisco-unified-contact-center-express_chapter_010.html

Q12. Which two host portion format conditions are true for directory URl on Cisco Unified Communications Manager? (Choose two.)

A. lt is case sensitive.

B. lt cannot start with a hyphen.

C. lt must have at least one character.

D. lt supports lPv4 or lPv6 addresses, or fully qualified domain names.

E. lt cannot end with a hyphen.

F. lt supports the & character.

Answer: B, E

Explanation:

Cisco Unified Communications Manager supports the following formats in the host portion of a directory URl (the portion after the @ symbol):

Supports lPv4 addresses or fully qualified domain names.

Accepted characters are a-z, A-Z ,0-9, hyphens, and dots.

The host portion cannot start or end with a hyphen.

The host portion cannot have two dots in a row.

Minimum of two characters.

The host portion is not case sensitive.

Reference:

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/bat/9_1_1/CUCM_BK_C271A69D_00_cucm-bulk-administration-guide-91/CUCM_BK_C271A69D_00_cucm-bulk-administration-guide-91_chapter_01001110.html

Q13. ln which call state does the Mobility soft key act as a toggle key to enable or disable Single Number Reach for Cisco Unified Communications Manager Express SCCP lP phones?

A. idle

B. seized

C. alerting

D. ringing

E. connected

Answer: A

Explanation:

Pressing the Mobility soft key during the idle call state enables the SNR feature. This key is a toggle; pressing it a second time disables SNR.

Reference:

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeadm/cmesnr.html

Q14. Which message is used by a Cisco Unified Communications Manager respond to periodic keepalives from a Cisco lOS MGCP gateway?

A. AUEP

B. RQNT

C. NTFY

D. 200

E. AUCX

Answer: D

Explanation:

(2xx) Successful completion: The requested transaction was executed normally.

Q15. Which three options are valid per-session video conference participants supported on the Cisco lntegrated Router Generation 2 with packet voice and video digital signal processor 3? (Choose three.)

A. 3

B. 4

C. 6

D. 8

E. 9

F. 12

G. 16

Answer: B, D, G

Explanation:

The integrated video conferencing services use the same DSP resources on PVDM3s that are used for widely deployed lSR G2 voice capabilities. These modules, in conjunction with Cisco lOS Software, perform audio and video mixing, video transcoding for certain resolutions, and other functions for video endpoints. PVDM3 modules support flexible media resources and conference profile management to maximize capacity with predictable end-user experiences.

Both homogenous and heterogonous video conferences are supported. A homogenous conference refers to one in which participants connect to the lSR G2 with devices that support the same video format attributes (for example, the same codec, resolution, frame rate, and bit rate). A heterogeneous conference refers to one in which participants can connect to a conference bridge with devices that support different video format attributes. Each conference allows 4-, 8-, or 16-party participants.

Reference:

http://www.cisco.com/c/en/us/products/collateral/unified-communications/voice-video-conferencing-isr-routers/data_sheet_c78-649427.html

Q16. Refer to the exhibit.

On which two Cisco Unified CM Administration pages can a system administrator define MTU for an SSL VPN tunnel connecting between a Cisco lP phone and a Cisco lOS VPN gateway? (Choose two.)

A.VPN Profile B.VPN Group C.VPN Gateway

D. VPN Feature Configuration

E. System, followed by Enterprise Parameters

F. System, followed by Enterprise Phone Configuration

Answer: A, D

Explanation: Reference:http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/security/8_5_1/secugd/sec-851- cm/secvpfet.html

Q17. Which Cisco Unified Contact Center Express core system software component communicates with Cisco Agent Desktop for agent state control and call control?

A. Unified CCX Engine

B. Database

C. Monitoring

D. Recording

E. RmCm

Answer: A

Explanation:

The Unified CCX Engine enables you to run multiple applications to handle Unified CM Telephony calls or HTTP requests. The Unified CCX Engine uses the Unified CM Telephony subsystem to request and receive services from the Computer Telephony lnterface (CTl) manager that controls Unified CM clusters. The Unified CCX Engine is implemented as a service that supports multiple applications. You can use a web browser to administer the Unified CCX Engine and your Unified CCX applications from any computer on the network. Unified CCX provides you the following two web interfaces:

Unified CCX Administration web interface: Used to configure system parameters, subsystems, view real-time reports that include total system activity and application statistics, and so on.

Unified CCX Serviceability web interface: Used to view alarm and trace definitions for Unified CCX services, start and stop the Unified CCX Engine, monitor Unified CCX Engine activity, and so on.

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