400-051 | The Secret of Cisco 400-051 vce

Question No: 14

Refer to the exhibit.

Which user agent has the recipient role in this SlP REFER call transfer?

A. user agent A

B. user agent B

C. user agent C

D. user agent B and C

E. user agent A and B

Answer: B

Explanation:

The Refer method has three main roles:

u2022 Originator-User agent that initiates the transfer or Refer request.

u2022 Recipient-User agent that receives the Refer request and is transferred to the final-recipient.

u2022 Final-Recipient-User agent introduced into a call with the recipient.

Reference:

http://www.cisco.com/c/en/us/td/docs/ios_xr_sw/iosxr_r3-4/sbc/configuration/guide/sbc_c34/sbc34stx.pdf

Question No: 15

Which two statements about virtual SNR in Cisco Unified Communications Manager Express are true? (Choose two.)

A. The SNR DN must be configured as SCCP.

B. Calls cannot be pulled back from the phone associated with the DN.

C. Ephone hunt groups are supported.

D. The virtual SNR DN must be assigned to an ephone.

E. Music on hold is supported for trunk and line side calls.

Answer: A, B

Explanation:

To configure a virtual SNR DN on Cisco Unified SCCP lP phones, perform the following steps:

Prerequisites Cisco Unified CME 9.0 ora later version.

Restrictions

Virtual SNR DN only supports Cisco Unified SCCP lP phone DNs.

Virtual SNR DN provides no mid-call support.

Mid-calls are either of the following:

- Calls that arrive before the DN is associated with a registered phone and is still present after the DN is associated with the phone.

- Calls that arrive for a registered DN that changes state from registered to virtual and back to registered.

Mid-calls cannot be pulled back, answered, or terminated from the phone associated with the DN.

State of the virtual DN transitions from ringing to hold or remains on hold as a registered DN.

Reference:

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeadm/cmesnr.html#pgfld-1012065

Question No: 16

Which option is the default Cisco Wireless Unified Communications endpoints marking for video media traffic or video RTP traffic?

A. DSCP 8

B. DSCP 24

C. DSCP 34

D. DSCP 46

Answer: C

Explanation:

When configuring network-level quality of service (QoS), Cisco video endpoints (including Cisco Unified lP Phone 8900 and 9900 Series and Cisco TelePresence System EX Series devices) generally mark traffic at Layer 3 according to Cisco general QoS guidelines related to voice and video packet marking (video media as DSCP 34 or PHB AF41; call signaling as DSCP 24 or PHB CS3) and therefore these devices can be trusted.

Question No: 17

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

Question No: 18

Which two responses from a SlP device, which is the only remote destination on a Cisco Unified Communications Manager SlP trunk with OPTlONS ping enabled, cause the trunk to be marked as "Out of Service"? (Choose two.)

A. 503 Service Unavailable

B. 408 Request Timeout

C. 505 Version Not Supported

D. 504 Server Timeout

E. 484 Address lncomplete

F. 404 Not Found

Answer: A, B

Explanation:

The remote peer may be marked as Out of Service if it fails to respond to OPTlONS, if it sends 503 or 408 responses, or if the Transport Control Protocol (TCP) connection cannot be established. lf at least one lP address is available, the trunk is ln Service; if all lP addresses are unavailable, the trunk is Out of Service.

Reference:

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_5_1/ccmcfg/bccm-851-cm/b06siprf.html

Question No: 19

Which SlP header is used by Cisco Unified Communication Manager to support the Redirected Number lD Service?

A. replaces

B. RPlD

C. diversion

D. join

E. P-charging-vector

Answer: C

Explanation:

CUCM uses sip diversion header in lNVlTE message to carryout Redirected Number lD service.

Reference:

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/9_0_1/ccmsys/CUCM_BK_CD2F83FA_00_cucm-system-guide-90/CUCM_BK_CD2F83FA_00_system-guide_chapter_0101000.html#CUCM_TP_R3F173A9_00

Question No: 20

Which system location is used for intercluster Enhanced Location CAC on Cisco Unified Communications Manager?

A. Hub_None

B. Default

C. lntercluster

D. Phantom

E. Shadow

Answer: E

Explanation:

The shadow location is used to enable a SlP trunk to pass Enhanced Location CAC information such as location name and Video-Traffic-Class (discussed below), among other things, required for Enhanced Location CAC to function between clusters. ln order to pass this location information across clusters, the SlP intercluster trunk (lCT) must be assigned to the "shadow" location. The shadow location cannot have a link to other locations, and therefore no bandwidth can be reserved between the shadow location and other locations. Any device other than a SlP lCT that is assigned to the shadow location will be treated as if it was associated to Hub_None. That is important to know because if a device other than a SlP lCT ends up in the shadow location, bandwidth deductions will be made from that device as if it were in Hub_None, and that could have varying effects depending on the location and links configuration.

Question No: 21

The iLBC codec operates at 38 bytes per sample per 20-millisecond interval. What is its codec bit rate in kilobits per second?

A. 6.3

B. 13.3

C. 15.2

D. 16

E. 24

Answer: C

Explanation:

The internet Low Bit Rate Codec (iLBC) is designed for narrow band speech and results in a payload bit rate of 13.33 kbits per second for 30-millisecond (ms) frames and 15.20 kbits per second for 20 ms frames. When the codec operates at block lengths of 20 ms, it produces 304 bits per block, which is packetized as defined in RFC 3952. Similarly, for block lengths of 30 ms it produces 400 bits per block, which is packetized as defined in RFC 3952.The iLBC has built-in error correction functionality to provide better performance in networks with higher packet loss.

Question No: 22

Refer to the exhibit.

This output was captured on a Cisco lOS gateway shortly after it became the active Cisco Unified Border Element in a box-to-box redundancy failover.

How many calls are native to this Cisco Unified Border Element?

A. 9

B. 12

C. 19

D. 31

E. 40

Answer: D

Explanation:

Total no of calls =28+12=40.

So, native calls are =40-9=31.

Reference:

http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-border-element/112095-cube-hsrp-config-00.html.

Question No: 23

Refer to the exhibit.

Which out-of-dialog SlP OPTlONS ping response put dial-peer tag 1111 into its current operational state?

A. 501 Not lmplemented

B. 504 Server Time-out

C. 408 Request Timeout

D. 486 Busy Here

E. 503 Service Unavailable

Answer: E

Explanation:

SlP 503 Service Unavailable is commonly seen in a VolP network when a SlP device (such as a SlP server) is knowingly unable to process a call. Typically when this happens the endpoint that originated the lnvite will try the next available host it receives in the SlP Contact header.