400-051 | All About Tested 400-051 braindumps

New Questions 4

Which two analog telephony signaling methods are most vulnerable to glare conditions? (Choose two.)

A. FXS Loop-start

B. FXO Ground-start

C. E&M Wink-start

D. E&M Delay-dial

E. E&M lmmediate-start

F. E&M Feature GroupD

Answer: A, E

Explanation:

The loop start signaling method is more common and is typically used by residential phone lines. When a voice port is configured with loop start signaling, the device (telephone) closes the circuit loop that signals the CO voice port to provide dial tone; an incoming call is signaled on the CO by supplying a predefined voltage on the line. The loop start signaling method has one main disadvantage in that it has no method of preventing both sides of the connection from attempting to seize the line at the same time; this condition is referred to as glare. Because of this, loop start signaling is typically not used on high demand circuits.

With immediate-start, the calling side of the connection seizes the line by going off hook on the E-lead and address information is sent using dual-tone multifrequency (DTMF) digits. lmmediate start signaling is vulnerable to glare just like loop-start signaling.

New Questions 5

What is the default treatment of a message that is left in the opening greeting default call handler in Cisco Unity Connection?

A. lt will be sent to the mailbox for the Operator user.

B. lt will be sent to the Undeliverable Messages distribution list.

C. lt will be sent to the mailbox of the system administrator.

D. lt will be sent to the All Voicemail Users distribution list.

E. lt will be sent to the General Delivery Mailbox.

Answer: B

Explanation:

Default call handler is selected when we don't assign any call handler to user and with this default call handler no specific user assigned so it don't go to any specific mail box and goes to lt will be sent to the Undeliverable Messages

distribution list

New Questions 6

Which Device Pool configuration setting will override the device-level settings only when a device is roaming within a device mobility group?

A. Region

B. Location

C. SRST Reference

D. Calling Party Transformation CSS

E. Media Resource Group List

Answer: D

Explanation:

Device Mobility Related Settings:

The parameters under these settings will override the device-level settings only when the device is roaming within a Device Mobility Group. The parameters included in these settings are:

u2022 Device Mobility Calling Search Space

u2022 AAR Calling Search Space

u2022 AAR Group

u2022 Calling Party Transformation CSS

u2022 Called Party Transformation CSS

The device mobility related settings affect the dial plan because the calling search space dictates the patterns that can be dialed or the devices that can be reached.

New Questions 7

How are queues serviced in Cisco lOS routers with the CBWFQ algorithm?

A. first-in, first-out

B. weighted round robin based on assigned bandwidth

C. strict priority based on assigned priority

D. last-in, first-out

E. weighted round robin based on assigned priority

Answer: B

Explanation:

Class Based Weighted Fair queuing is an advanced form of WFQ that supports user defined traffic classes i.e. one can define traffic classes based on match criteria like protocols, access control lists (ACLs), and input interfaces. A flow satisfying the match criteria for a class contributes the traffic for that particular defined class. A queue is allocated for each class, and the traffic belonging to that class is directed to the queue for that class.

New Questions 8

Assume a 30-millisecond 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 eight VolP calls that use a G.729 codec over a multilink PPP link with cRTP enabled?

A. 121.6 kb/s

B. 92.8 kb/s

C. 88.4 kb/s

D. 83.2 kb/s

E. 78.4 kb/s

Answer: D

Explanation:

Reference: http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml

New Questions 9

Which two security services are provided by the Phone Proxy function on a Cisco ASA appliance? (Choose two.)

A. lt provides interworking to ensure that external lP phone traffic is encrypted, as long as the Cisco Unified Communications Manager cluster runs in secure mode.

B. lt only applies to encrypted voice calls where both parties utilize encryption.

C. lt manipulates the call signaling to ensure that all media is routed via the adaptive security appliance.

D. lt supports encrypted TFTP operation of lP phone configuration files.

E. lt intercepts and authenticates soft clients before they reach Cisco Unified Communications Manager clusters.

F. lt requires a remote routing device with an lPsec VPN tunnel.

Answer: C, E

Explanation:

When using TLS Proxy, the Cisco ASA appliance is inserted between the phones and Cisco Unified Communications Manager. The phones will now establish a TLS session with the ASA appliance. The appliance will, in turn, establish a proxy TLS connection with Cisco Unified Communications Manager on the phone's behalf. This function generates two TLS sessions.

New Questions 10

The number of calls waiting in a Cisco Unified Communications Manager native call queue has reached its maximum limit.

Which statement about what happens to additional incoming calls is true?

A. Calls are handled according to the Forward Hunt Busy settings on the Hunt Pilot configuration page.

B. Calls are handled according to the Forward Hunt No Answer settings on the Hunt Pilot configuration page.

C. Calls are handled according to the Forward Hunt Busy settings on the Line Group members.

D. Calls are handled according to the Hunt Options settings on the Line Group Configuration page.

E. Calls are handled according to the When Queue ls Full settings on the Hunt Pilot Configuration page.

Answer: E

Explanation:

There are three main scenarios where alternate numbers are used:

When queue is full

When maximum wait time is met

When no hunt members are logged in or registered

When queue is full

Call Queuing allows up to 100 callers to be queued per hunt pilot (the maximum number of callers allowed in queue on a hunt pilot page). Once this limit for new callers been reached on a particular hunt pilot, subsequent calls can be routed to an alternate number. This alternate number can be configured through the Hunt Pilot configuration page (through the "Destination When Queue is Full" settings).

When maximum wait time is met

Each caller can be queued for up to 3600 seconds per hunt pilot (the maximum wait time in queue). Once this limit is reached, that caller is routed to an alternate number. This alternate number can be configured through the Hunt Pilot configuration page (through the "Maximum wait time in queue" settings).

When no hunt members are logged in or registered

ln a scenario where none of the members of the hunt pilot are available or registered at the time of the call, hunt pilot configuration provides an alternate number field (through the "When no hunt members are logged in or registered" settings) where calls can be routed. For Call Queuing, a hunt pilot member is considered available if that member has both deactivated do not disturb (DND) and logged into the hunt group. ln all other cases, the line member is considered unavailable or logged off.

Reference:

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/9_0_1/ccmfeat/CUCM_BK_CEF0C471_00_cucm-features-services-guide-90/CUCM_BK_CEF0C471_00_cucm-features-and-services-guide_chapter_0111.html

New Questions 11

To which Cisco enterprise medianet application class does Cisco Unified Personal Communicator belong?

A. VolP Telephony

B. Real-time lnteractive

C. Multimedia Conferencing

D. Broadcast Video

E. Low Latency Data

Answer: C

Explanation:

Enterprise Medianet QoS Recommendations

Reference:

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSlntro_40.html#pgfld-61116

New Questions 12

When the Cisco Unified Communications Manager service parameter "Auto Call Pickup Enabled" is selected, which two softkeys on an lP phone connect you to an incoming call? (Choose two.)

A. Pickup

B. Gpickup

C. CallBack

D. Select

E. Join

Answer: A, B

Explanation:

Pickup softkey is used to receive a call that is ringing in another phone within the same pickup group and Gpickupsoftkey is used to receive calls that are ringing but that phone is another pickup group.

New Questions 13

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