Cisco 400-051 Online Practice Questions and Exam Preparation

Cisco 400-051 Online Questions & Answers

• Question 231:

  Sip Provisional Response Acknowledgment is used in all of the following SIP 1xx responses except:

  A. 100 Trying
  B. 180 Ringing
  C. 199 Early Dialog Terminated
  D. 183 Session in Progress
  E. 182 Queued
  A. 100 Trying

• Question 232:

  Refer to the exhibit.

  

  Which option describes the security encryption status of this active call on a Cisco IP phone?

  A. unencrypted call signaling and media
  B. encrypted call signaling but unencrypted call media
  C. encrypted call media but unencrypted call signaling
  D. encrypted call signaling and media
  E. Not enough information provided to answer this question.
  D. encrypted call signaling and media

• Question 233:

  Refer to the exhibit.

  

  During a QSIG tunneling over SIP call establishment, which two types of SIP messages can the OGW use to tunnel a waiting QSIG message? (Choose two.)

  A. SIP re-INVITE
  B. SIP NOTIFY
  C. SIP INFO
  D. SIP OPTIONS
  E. SIP UPDATE
  F. SIP REFER
  A. SIP re-INVITE
  E. SIP UPDATE

  ---

  The TGW sends and the OGW receives a 200 OK response--the OGW sends an ACK message to the TGW and all successive messages during the session are encapsulated into the body of SIP INFO request messages. There are two

  exceptions:

  When a SIP connection requires an extended handshake process, renegotiation, or an update, the gateway may encapsulate a waiting QSIG message into a SIP re-INVITE or SIP UPDATE message during QSIG call establishment. When the

  session is terminated, gateways send a SIP BYE message. If the session is terminated by notice of a QSIG RELEASE COMPLETE message, that message can be encapsulated into the SIP BYE message.

  References: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/sip/configuration/15-mt/sip-config-15-mt-book/voi-sip-tdm.html

• Question 234:

  How are queues serviced in Cisco IOS 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
  B. weighted round robin based on assigned bandwidth

  ---

  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.

• Question 235:

  What is the maximum number of configurable speed dial entries for a Cisco Unified 9971 IP Phone?

  A. 4
  B. 199
  C. 50
  D. 3
  E. 2
  B. 199

  ---

  References:

• Question 236:

  Which Cisco Unified CM Application user is created by default and used by Cisco Unified CM Extension Mobility?

  A. CCMAdministrator
  B. EMSysUser
  C. TabSyncSysUser
  D. CCMSysUser
  E. CTIGWUser
  D. CCMSysUser

• Question 237:

  Refer to the exhibit.

  

  This output was captured on a Cisco IOS 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
  D. 31

  ---

  Total no of calls =28+12=40. So, native calls are =40-9=31.

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

• Question 238:

  Assume 6 bytes for the Layer 2 header, 1 byte for the end-of-frame flag, and a 40-millisecond voice payload, how much bandwidth should be allocated to the strict priority queue for five VoIP calls that use a G.729 codec over a multilink PPP link?

  A. 87 kb/s
  B. 134 kb/s
  C. 102.6 kb/s
  D. 77.6 kb/s
  E. 71.3 kb/s
  A. 87 kb/s

  ---

  Voice payloads are encapsulated by RTP, then by UDP, then by IP. 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/IP packet streams. UDP provides multiplexing and checksum capability; RTP provides payload identification, timestamps, and sequence numbering.

• Question 239:

  Which definition is included in a Cisco UC on UCS TRC?

  A. storage arrays such as those from EMC or NetApp, if applicable
  B. configuration of virtual-to-physical network interface mapping
  C. step-by-step procedures for hardware BIOS, firmware, drivers, and RAID setup
  D. server model and local components (CPU, RAM, adapters, local storage) at the part number level
  E. configuration settings and patch recommendations for VMware software
  D. server model and local components (CPU, RAM, adapters, local storage) at the part number level

  ---

  What does a TRC definition include?

  Definition of server model and local components (CPU, RAM, adapters, local storage) at the orderable part number level.

  Required RAID configuration (e.g. RAID5, RAID10, etc.) - including battery backup cache or SuperCap - when the TRC uses DAS storage

  Guidance on hardware installation and basic setup (e.g. click here).

  -

  Click here for detailed Cisco UCS server documentation regarding hardware configuration procedures.

  -

  Configuration of Virtual-to-physical network interface mapping is design-dependent and not included in TRC definition.

  -

  Configuration of adapters (such as Cisco VIC, 3rd-party CNA / NIC / HBA) is design-dependent and not included in TRC definition.

  -

  Configuration settings or step by step procedures for hardware BIOS, firmware, drivers, RAID setup are not included. Click here for detailed Cisco UCS server documentation.

  Design, installation and configuration of external hardware is not included in TRC definition, such as:

  -

  Network routing and switching (e.g. routers, gateways, MCUs, ethernet/FC/FCoE switches, Cisco Catalyst/Nexus/MDS, etc.)

  -QoS configuration of route/switch network devices

  -

  Cisco UCS B-Series chassis and switching components (e.g. Cisco UCS 6100/6200, Cisco UCS 2100/2200, Cisco UCS 5100)

  -

  Storage arrays (such as those from EMC, NetApp or other vendors)

  Configuration settings, patch recommendations or step by step procedures for VMware software are not included in TRC definition.

  Infrastructure solutions such as Vblock from Virtual Computing Environment may also be leveraged for configuration details not included in the TRC definition.

  Reference: http://docwiki.cisco.com/wiki/UC_Virtualization_Supported_Hardware#UC_on_UCS_Tested_Reference_Configurations

• Question 240:

  In the Cisco Unified Mobile Voice Access feature on Cisco Unified Communications Manager, which two calling search space configuration options are significant in routing the second stage call, after the user is authenticated and dialed digits are collected? (Choose two.)

  A. remote destination profile rerouting CSS
  B. mobility user's phone device level CSS
  C. phone line level CSS of the mobility user
  D. concatenation of remote destination profile CSS and line CSS
  E. trunk or gateway inbound CSS
  F. calling number transformation CSS of the remote destination
  A. remote destination profile rerouting CSS
  F. calling number transformation CSS of the remote destination