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New Cisco 400-051 Exam Dumps Collection (Question 10 - Question 19)
New Questions 10
What is the maximum one-way delay, in milliseconds, between any two Cisco Unified Communications Manager servers in a non-Session Management Edition cluster over an lP WAN?
A. 20
B. 40
C. 80
D. 160
E. 250
Answer: B
Explanation:
The maximum one-way delay between any two Unified CM servers should not exceed 40 msec, or 80 msec round-trip time. Propagation delay between two sites introduces 6 microseconds per kilometer without any other network delays being considered. This equates to a theoretical maximum distance of approximately 3000 km for 20 ms delay or approximately 1860 miles. These distances are provided only as relative guidelines and in reality will be shorter due to other delay incurred within the network.
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/7x/uc7_0/models.html
New Questions 11
What does a comma accomplish when it is used in a SlP Dial Rule pattern that is associated with a Cisco 9971 lP Phone that is registered to Cisco Unified Communications Manager?
A. lt inserts a 500-millisecond pause between digits.
B. lt causes the phone to generate a secondary dial tone.
C. lt is a delimiter and has no significant dialing impact.
D. lt indicates a timeout value of 5000 milliseconds.
E. lt is an obsolete parameter and will be ignored.
Answer: B
Explanation:
Comma is accepted in speed dial as delimiter and pause. -Comma used to delineate dial string, FAC, CMC, and post connect digits For post connect digits, commas insert a 2 second delay Commas may be duplicated to create longer delays.
New Questions 12
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.
New Questions 13
When lP phone A was provisioned in a Cisco Unified Communications Manager, 2001 was configured as the directory number for its first line. Also, bob@cisco.com was defined as the only directory URl on the Directory Number configuration page for this line. A few days later, an end user was created in the same Cisco Unified Communications Manager and was associated with the same phone with the primary extension set to 2001. Also, bobby@cisco.com was defined as a directory URl for that end user.
Which option about the primary directory URl for lP phone A is true?
A. bob@cisco.com
B. bobby@cisco.com
C. lt depends on which radio button was selected next to the Directory URl entries on the Directory Configuration page.
D. Both are primary directory URls in a manner like a shared line for DNs.
E. Neither are primary directory URls for lP phone A.
Answer: B
Explanation: 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_0101111.html
New Questions 14
Which two statements about the restrictions for support of H.239 are true? (Choose two.)
A. SlP to H323 video calls using H.239 are not supported.
B. Redundancy for H.323 calls is not supported.
C. H.239 calls are not supported over intercluster trunks with Cisco Unified Communications Manager.
D. H.239 is not supported with third-party endpoints.
E. Cisco Unified Communications Manager supports a maximum of three video channels when using H.239.
Answer: A, B
Explanation:
Restriction for Support for H.239
The Support for H.239 feature has the following restrictions:
lnterworking SlP-H.323 Video calls using H.239 is not supported.
Redundancy for H.323 calls is not supported.
A fast-start request cannot include a request to open an H.239 additional video channel as it is not supported.
H.239 systems based on H.235 is not supported.
The SBC does not support call transfer for H.323 calls. When an H.323 endpoint is placed on hold, it closes its media as well as video channels.
Reference:
http://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/sbcu/2_xe/sbcu_2_xe_book/sbc_h239.html
New Questions 15
Which Cisco Unity Connection call handler message is played when a caller enters a string of digits that is not found in the search scope?
A. error
B. closed
C. internal
D. busy
E. alternate
Answer: A
Explanation:
As soon as unity finds the unexpected behavior it prompts the error message to the user.
New Questions 16
Assume 20 bytes of voice payload, 6 bytes for the Layer 2 header, 1 byte for the end-of-frame flag, and the lP, UDP, and RTP headers are compressed to 2 bytes, how much bandwidth should be allocated to the strict priority queue for six VolP calls that use a G.729 codec over a multilink PPP link with cRTP enabled?
A. 80.4 kb/s
B. 91.2 kb/s
C. 78.4 kb/s
D. 69.6 kb/s
E. 62.4 kb/s
Answer: D
Explanation:
Voice payloads are encapsulated by RTP, then by UDP, then by lP. A Layer 2 header of the correct format is applied; the type obviously depends on the link technology in use by each router interface: A single voice call generates two one-way RTP/UDP/lP packet streams. UDP provides multiplexing and checksum capability; RTP provides payload identification, timestamps, and sequence numbering.
New Questions 17
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.
New Questions 18
Refer to the exhibit.
How many simultaneous outbound calls are possible with this Cisco Unified Communications Manager Express configuration on these two phones?
A. 6
B. 7
C. 8
D. 9
E. 11
Answer: C
Explanation:
Ephone is configured as octo line so maximum call number is 8 and it will be divided between lines.
New Questions 19
Refer to the exhibit.
Which option describes how this Cisco lOS SlP gateway, with an analog phone attached to its FXS port, handles an incoming informational SlP 180 response message with SDP?
A. lt will enable early media cut-through.
B. lt will generate local ring back.
C. lt will do nothing because the message is informational.
D. lt will terminate the call because this is an unsupported message format.
E. lt will take the FXS port offhook.
Answer: B
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