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Home Cisco® 400-051

Cisco® 400-051 Exam Practice Questions (P. 2)

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Question #11
Which two statements about the Peer Firmware Sharing option for IP phone firmware distribution are true? (Choose two.)
  1. A
    This option uses a parent-child hierarchy in which a firmware image is downloaded by a parent phone to up to three directly associated child phones.
  2. B
    This option must be enabled on Cisco Unified Communications Manager service parameters for Cisco TFTP.
  3. C
    This option mandates that the parent phone and child phones be identical, selected phone models.
  4. D
    This option allows firmware transfers between phones in different subnets, as long as the round-trip delay is less than 5 milliseconds.
  5. E
    This option uses a parent-child hierarchy that must be manually defined by the Cisco Unified Communications Manager administrator.
  6. F
    This option allows falling back to the TFTP server in the Cisco Unified Communications Manager cluster.

Correct Answer:
CF
Peer Firmware Sharing works by setting up a parent-child hierarchy of the phones in which a firmware image is downloaded by the parent phone to a child phone.
The advantage of using Peer Firmware Sharing is that instead of all phones individually retrieving a software image, they pass the image along from one phone to another phone on the same subnet.
Advantage of PFS:
✑ Hierarchy is automatic
✑ One download per phone model on a subnet
✑ Uses TCP
✑ Fails back to TFTP
✑ Speeds up LAN upgrades
✑ Reduces TFTP CPU load during upgrade

Question #12
Which two statements about the Cisco UC on UCS specs-based virtualization support model are true? (Choose two.)
  1. A
    It has a configuration-based approach.
  2. B
    It has a rule-based approach.
  3. C
    It has less hardware flexibility compared to the third-party server specs-based support model.
  4. D
    It has less hardware flexibility compared to the UC on UCS TRC support model.
  5. E
    VMware vCenter is optional with this support model.

Correct Answer:
BC
References: http://docwiki.cisco.com/wiki/UC_Virtualization_Supported_Hardware#UC_on_UCS_Tested_Reference_Configurations

Question #13
Which definition is included in a Cisco UC on UCS TRC?
  1. A
    required RAID configuration, when the TRC uses direct-attached storage
  2. B
    configuration of virtual-to-physical network interface mapping
  3. C
    step-by-step procedures for hardware BIOS, firmware, drivers, and RAID setup
  4. D
    configuration settings and patch recommendations for VMware software
  5. E
    server model and local components (CPU, RAM, adapters, local storage) by name only; part numbers are not included because they change over time

Correct Answer:
A
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.
- 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.
✑ 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.

Question #14
Which capability is support by LLDP-MED but not by Cisco Discovery Protocol?
  1. A
    LAN speed discovery
  2. B
    network policy discovery
  3. C
    location identification discovery
  4. D
    power discovery
  5. E
    trust extension

Correct Answer:
A
LLDP-MED supports both LAN speed and duplex discovery. Cisco Discovery Protocol supports duplex discovery only, but this limited support is not seen as a problem because if there is a speed mismatch, LLDP-MED and Cisco Discovery Protocol cannot be exchanged and thus cannot be used to detect the mismatch.

Question #15
In a Cisco EnergyWise domain, which two terms describe a Cisco IP phone? (Choose two.)
  1. A
    endpoint
  2. B
    domain member
  3. C
    child domain member
  4. D
    EnergyWise agent
  5. E
    Cisco power distribution unit

Correct Answer:
AC
References: http://www.cisco.com/en/US/docs/switches/lan/energywise/phase2_5/ios/configuration/guide/one_ent.html

Question #16
Which statement about Cisco EnergyWise domain member neighbor formation is true?
  1. A
    Cisco EnergyWise supports static neighbors, but the neighbor relationship is only possible if a noncontiguous domain member and a contiguous domain member have a static neighbor entry pointing to each other.
  2. B
    Cisco EnergyWise static neighbors can be formed even if domain members are not physically contiguous.
  3. C
    Static neighbors can be manually defined on Cisco EnergyWise domain members, but TCP protocols must be used.
  4. D
    Static neighbors can be manually defined on Cisco EnergyWise domain members, but they have a lower priority compared to the autodiscovered members.
  5. E
    Static neighbors can be manually defined on Cisco EnergyWise domain members and the TCP or UDP protocol can be used.

Correct Answer:
B
References: http://www.cisco.com/en/US/docs/solutions/Enterprise/Borderless_Networks/Energy_Management/energywisedg.html? referring_site=smartnavRD#wp554384

Question #17
Refer to the exhibit.


Assuming that the administrator has never performed any manual custom uploads, which two file types can be found when you choose Software Upgrades, followed by TFTP File Management on the Cisco Unified Operating System Administration web page for Cisco Unified Communications Manager? (Choose two.)
  1. A
    IP phone configuration files
  2. B
    announcement audio files
  3. C
    ringer files
  4. D
    IP phone license files
  5. E
    sample music-on-hold audio files
  6. F
    softkey template files

Correct Answer:
BC
The two file types that we get are Announcement Audio Files and Ringer Files.

Question #18
Which four attributes are needed to determine the time to complete a TFTP file transfer process? (Choose four.)
  1. A
    file size
  2. B
    file type
  3. C
    network interface type
  4. D
    round-trip time
  5. E
    packet loss percentage
  6. F
    response timeout
  7. G
    network throughput

Correct Answer:
ADEF
Four attributes that are needed to determine the time to complete TFTP file transfer process is:
1. File Size
2. Round-trip time
3. Packet loss percentage
4. Response timeout
References: http://www.cisco.com/en/US/prod/collateral/voicesw/ps6882/ps6884/white_paper_c11-583891_ps10451_Products_White_Paper.html

Question #19
What is the maximum number of call-processing subscribers in a standard deployment of a Cisco Unified Communications Manager Session Management Edition cluster?
  1. A
    3
  2. B
    4
  3. C
    5
  4. D
    8
  5. E
    16

Correct Answer:
D
There is no deployment difference between CUCM & CUCM session management Edition cluster. The only difference is that CUCM SME is designed to support a large number of trunk to trunk connections. Thus, 8 subscribers.

Question #20
Which two SCCP call signaling messages are initiated by Cisco Unified Communications Manager to an IP phone? (Choose two.)
  1. A
    SoftKeyEvent
  2. B
    CloseReceiveChannelAck
  3. C
    CallState
  4. D
    KeypadButton
  5. E
    OpenReceiveChannel
  6. F
    Offhook

Correct Answer:
CE
Upon receiving an OpenReceiveChannelmessage, the IP phone selects the UDP port number it wants to use to receive RTP packets and reports this information to call manager.
With the SCCP protocol architecture, the majority of the H.323 processing power resides in an H.323 proxy the Cisco CallManager. The end stations (IP phones) run the Skinny client, which consumes less processing overhead. The client communicates with CallManager using connection-oriented (TCP/IP-based) communication to establish a call with another H.323-compliant end station. Once Cisco CallManager has established the call, the two H.323 end stations use connectionless (UDP/IP-based) communication for audio transmissions.

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