400-051 Exam Questions
Version: 19.0
Question: 1
Which two statements about using the Load Server option for IP phone firmware distribution are true? (Choose two.)
A. This option must be enabled on at least two servers in a Cisco Unified Communications Manager cluster.
B. This option must be enabled on Cisco Unified Communications Manager service parameters for Cisco TFTP.
C. Phone firmware must be manually copied to any applicable load servers.
D. The load server will not function if its IP address is not in the same subnet as the IP phones.
E. This option is only available for newer IP phone models.
F. This option does not accommodate falling back to Cisco TFTP on error.
Answer: C, F
Explanation:
Choosing the Right Distribution Method
Which of the three different image-distribution methods discussed so far is the best for a customer deployment? Each method has advantages and disadvantages, and they are summarized in Table 1.
Table 1. Summary of Distribution Models
Peer Firmware Sharing
Load Server
TraditionalTFTP
Advantages
- 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
- Has same download time as LAN image distribution
- Distributes TFTP load over multiple TFTP servers
- Proven distribution
- Defaultbehavior
Disadvantages
- Must be enabled on each phone
- Hierarchy is formed for each phone model
- Hierarchy is limited to subnet
- IPmustbesetoneachphone
- Administratormustmanuallyfilecopytoloadserver
- NofailbacktoTFTPonerror
- More prone to user error
- High-bandwidth requirements
- Multiple requests for same file
- HighCPUusageonTFTPserver
Reference: http://www.cisco.com/en/US/prod/collateral/voicesw/ps6882/ps6884/white_paper_c11-583891.pdf
Question: 2
Which two statements about the Peer Firmware Sharing option for IP phone firmware distribution are true? (Choose two.)
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.
B. This option must be enabled on Cisco Unified Communications Manager service parameters for Cisco TFTP.
C. This option mandates that the parent phone and child phones be identical, selected phone models.
D. This option allows firmware transfers between phones in different subnets, as long as the round-trip delay is less than 5 milliseconds.
E. This option uses a parent-child hierarchy that must be manually defined by the Cisco Unified Communications Manager administrator.
F. This option allows falling back to the TFTP server in the Cisco Unified Communications Manager cluster.
Answer: C, F
Explanation:
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: 3
Which two statements about the Cisco UC on UCS specs-based virtualization support model are true? (Choose two.)
A. It has a configuration-based approach.
B. It has a rule-based approach.
C. It has less hardware flexibility compared to the third-party server specs-based support model.
D. It has less hardware flexibility compared to the UC on UCS TRC support model.
E. VMware vCenter is optional with this support model.
Answer: B, C
Reference: http://docwiki.cisco.com/wiki/UC_Virtualization_Supported_Hardware#UC_on_UCS_Tested_Reference_Configurations
Question: 4
Which definition is included in a Cisco UC on UCS TRC?
A. required RAID configuration, when the TRC uses direct-attached storage
B. configuration of virtual-to-physical network interface mapping
C. step-by-step procedures for hardware BIOS, firmware, drivers, and RAID setup
D. configuration settings and patch recommendations for VMware software
E. server model and local components (CPU, RAM, adapters, local storage) by name only; part numbers are not included because they change over time
Answer: A
Explanation:
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: 5
Which capability is support by LLDP-MED but not by Cisco Discovery Protocol?
A. LAN speed discovery
B. network policy discovery
C. location identification discovery
D. power discovery
E. trust extension
Answer: A
Explanation:
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: 6
In a Cisco EnergyWise domain, which two terms describe a Cisco IP phone? (Choose two.)
A. endpoint
B. domain member
C. child domain member
D. EnergyWise agent
E. Cisco power distribution unit
Answer: A, C
Reference: http://www.cisco.com/en/US/docs/switches/lan/energywise/phase2_5/ios/configuration/guide/one_ent.html
Question: 7
Which statement about Cisco EnergyWise domain member neighbor formation is true?
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.
B. Cisco EnergyWise static neighbors can be formed even if domain members are not physically contiguous.
C. Static neighbors can be manually defined on Cisco EnergyWise domain members, but TCP protocols must be used.
D. Static neighbors can be manually defined on Cisco EnergyWise domain members, but they have a lower priority compared to the autodiscovered members.
E. Static neighbors can be manually defined on Cisco EnergyWise domain members and the TCP or UDP protocol can be used.
Answer: B
Reference: http://www.cisco.com/en/US/docs/solutions/Enterprise/Borderless_Networks/Energy_Management/energywisedg.html?referring_site=smartnavRD#wp554384
Question: 8
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.)
A. IP phone configuration files
B. announcement audio files
C. ringer files
D. IP phone license files
E. sample music-on-hold audio files
F. softkey template files
Answer: B, C
Explanation:
The two file types that we get are Announcement Audio Files and Ringer Files.
Question: 9
Which four attributes are needed to determine the time to complete a TFTP file transfer process? (Choose four.)
A. file size
B. file type
C. network interface type
D. round-trip time
E. packet loss percentage
F. response timeout
G. network throughput
Answer: A, D, E, F
Explanation:
Four attributes that are needed to determine the time to complete TFTP file transfer process is:
File Size
Round-trip time
Packet loss percentage
Response timeout
Reference: http://www.cisco.com/en/US/prod/collateral/voicesw/ps6882/ps6884/white_paper_c11-583891_ps10451_Products_White_Paper.html
Question: 10
What is the maximum number of call-processing subscribers in a standard deployment of a Cisco Unified Communications Manager Session Management Edition cluster?
A. 3
B. 4
C. 5
D. 8
E. 16
Answer: D
Explanation:
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: 11
Which two SCCP call signaling messages are initiated by Cisco Unified Communications Manager to an IP phone? (Choose two.)
A. SoftKeyEvent
B. CloseReceiveChannelAck
C. CallState
D. KeypadButton
E. OpenReceiveChannel
F. Offhook
Answer: C, E
Explanation:
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.
Question: 12
Which two SCCP call signaling messages are sent by an IP phone to Cisco Unified Communications Manager? (Choose two.)
A. SoftKeyEvent
B. OpenReceiveChannelAck
C. StartMediaTransmission
D. SelectSoftKeys
E. CloseReceiveChannel
F. StopTone
Answer: A, B
Explanation:
This message indicates which soft key was pressed. Upon receipt of this message, CallManager invokes the action associated with the pressed soft key. For example, if Hold was the pressed soft key, CallManager places the active call on user hold. In some trace files you might see a soft key number without the corresponding description. The following list defines each soft key number.
Question: 13
Company ABC is planning to migrate from MCS-hosted Cisco Unified Communications Manager applications to Cisco UC on UCS B-Series servers. Which statement about installation media support is true for this migration?
A. The install log can be written to a USB flash drive that is attached to the UCS server.
B. The answer file that is generated by the Answer File Generator (platformConfig.xml) can be read from a USB flash drive to perform an unattended installation on the UCS server.
C. The Cisco Music on Hold USB audio sound card can be mapped to a virtual USB port on a VMware virtual machine on the UCS server.
D. The answer file that is generated by the Answer File Generator (platformConfig.xml) can be read from an FLP image that is mounted in a virtual floppy drive.
E. The Cisco Music on Hold USB audio sound card can be mapped to a virtual serial port on a VMware virtual machine on the UCS server.
Answer: D
Explanation:
Using the AFG will allow you to get this license mac before even touching the server. It is provided after filling in the main form of the AFG but it can also be found by looking at the last few lines of your platformconfig.xml file.
Once you have the xml files, you will need to map those to the floppy drive of the VM (no usb support on the VM OVA). There are many ways to do this. I simply use a freeware virtual floppy app that I drop the platformconfig.xml file on and then copy the*.flp image out to the datastore. I’ll end up with a directory on my datastore called AFG that has the host named *.flp images that I will use during install. It also serves as archival of these files in the event the server needs to be re-imaged. This is important because the license mac will change if every parameter is not entered exactly as it was prior. If the license mac changes, you will have to go through the process of requesting new license files to be generated.
Reference: http://angryciscoguy.com/jello/cisco-answer-file-generator-to-the-rescue/
Question: 14
Which statement about the Cisco UC on UCS TRC and the third-party server specs-based virtualization support model is true?
A. Both the UC on UCS TRC and the third-party servers spec-based support models have rule-based approaches.
B. The UC on UCS TRC support model has a rule-based approach and the third-party servers spec-based support model has a configuration-based approach.
C. The UC on UCS TRC support model requires a high level of virtualization experience while the third-party server spec-based support model requires a low to medium level virtualization experience.
D. VMware vCenter is mandatory for the UC on UCS TRC support model but it is optional for the third-party server spec-based support model.
E. VMware vCenter is optional for the UC on UCS TRC support model but it is mandatory for the third-party server spec-based support model.
Answer: E
Explanation:
VMware vCenter is
optional when deploying on UC on UCS Tested Reference Configuration hardware
mandatory when deploying on UC on UCS Specs-based and Third-party Server Specs-based hardware.
vCenter Statistics Level 4 logging is mandatory so that Cisco TAC is able to provide effective support.
Click here for how to configure VMware vCenter to capture these logs. If not configured by default, Cisco TAC may request enabling these settings in order to provide effective support.
Also note that enablement of specific VMware vSphere management features may require vCenter and/or a higher feature Edition of vSphere ESXi.
Cisco Collaboration does not require its own dedicated vCenter.
Note that when VMware vCenter is not required and is not used, then VMware vSphere ESXi's default management interface is its free/included VMware vSphere Client (formerly branded VI Client).
Reference: http://docwiki.cisco.com/wiki/Unified_Communications_VMware_Requirements
Question: 15
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
Answer: D
Explanation:
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: 16
Which capability is supported by Cisco Discovery Protocol but not by LLDP-MED?
A. LAN speed and duplex discovery
B. Network policy discovery
C. Location identification discovery
D. Power discovery
E. Trust extension
Answer: E
Explanation:
Cisco Discovery Protocol provides an additional capability not found in LLDP-MED that allows the switch to extend trust to the phone. In this case, the phone is now trusted to mark the packets received on the PC port accordingly. This feature can be used to off-load the switch because now it does not need to police the information being received from the phone.
Question: 17
Which two mechanisms does Cisco EnergyWise use for neighbor discovery? (Choose two.)
A. multicast
B. LLDP-MED
C. UDP broadcast
D. Cisco Discovery Protocol
E. TCP
Answer: C, D
Explanation:
Cisco EnergyWise Neighbor Discovery Process
The Cisco EnergyWise neighbor discovery process is the mechanism by which domain members discover each other and populate their Cisco EnergyWise neighbor tables. Cisco EnergyWise queries can subsequently be distributed to all domain members using the neighbor relationships to monitor and control the power usage of devices within a domain. Cisco EnergyWise domain members automatically discover their neighbors through one of two mechanisms:
Cisco EnergyWise UDP broadcast packet
Cisco EnergyWise CDP packets
UDP broadcast packets are automatically sent out switch ports which support Cisco EnergyWise, regardless of whether the interfaces are configured with the no energywise interface-level command. CDP packets are sent when CDP is configured for the switch ports.
Reference: http://www.cisco.com/en/US/docs/solutions/Enterprise/Borderless_Networks/Energy_Management/energywisedg.html?referring_site=smartnavRD#wp555927
Question: 18
Which protocol does the Cisco Prime LAN Management Solution application use to communicate with Cisco EnergyWise domain members?
A. UDP broadcast
B. Cisco Discovery Protocol
C. UDP unicast
D. TCP
E. multicast
Answer: D
Explanation:
Cisco Prime LMS 4.1 uses TCP port 43440.
Question: 19
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? (Choose two.)
A. IP phone configuration files
B. sample music-on-hold audio files
C. Identity Trust List files
D. IP phone license files
E. Mobile Voice Access audio files
F. softkey template files
Answer: C, E
Explanation:
We get option for Identity Trust list Files and Mobile Voice Access audio files.
Question: 20
Which statement describes a disadvantage of using the Cisco TFTP service to serve IP phone load files?
A. The Cisco TFTP services can run on only one Cisco Unified Communications Manager server in a cluster.
B. Because TFTP operates on top of UDP, there is a high risk of corrupted load file delivery at the completion of the TFTP process due to undetected data loss in the network.
C. If a response is not received in the timeout period, the TFTP server will not resend the data packet.
D. Packet loss can significantly increase the TFTP session completion time.
E. Because TFTP operates with an adaptive timeout period, the time to complete the file transfer is unpredictable.
Answer: D
Explanation:
Voice traffic cannot recapture lost packets. Rather than retransmitting a lost network connection, the phone resets and attempts to reconnect its network connection.