2013 Latest CCNA Voice 640-461 Real Exam Question 136-139


Which report can you use to display all currently unassigned directory numbers?
A. Route Plan Report
B. Directory Number Assignment
C. Unassigned Objects Report
D. IP Phone Number Assignment
Correct Answer: A Section: CUCM Explanation
Route Plan Report
The route plan report lists all assigned and unassigned directory numbers (DN), call park numbers, call pickup numbers, conference numbers, route patterns, translation patterns, message-waiting indicators, voice mail ports, and Cisco CallManager Attendant Console pilot numbers in the system. The route plan report allows you to view either a partial or full list and to go directly to the associated configuration windows by clicking the Pattern/Directory Number, Partition, or Route Detail fields.
In addition, the route plan report allows you to save report data into a .csv file that you can import into other applications. The .csv file contains more detailed information than the web pages, including directory numbers for phones, route patterns, pattern usage, device name, and device description.
Cisco CallManager uses the route plan to route both internal calls and external public switched telephone network (PSTN) calls. For more detailed information on the route plan, refer to the “Understanding Route Plans” section in Cisco CallManager System Guide.
Link: http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/4_1_3/ccmcfg/b03rtrep.html

An engineer is installing an IP phone in a remote location. When the engineer plugs the IP phone into the network, the phone does not power up. What is the first thing that should be checked?
A. Power over Ethernet switch
B. Cisco Unified Communications Manager Server
C. Cisco Unified Presence
D. DHCP server
Correct Answer: A Section: IP Phone Explanation
Symptom: The Cisco Unified IP Phone Does Not Go Through its Normal Startup Process
When you connect a Cisco Unified IP Phone into the network port, the phone should go through its normal startup process as described in “Verifying the Phone Startup Process” section and the LCD screen should display information. If the phone does not go through the startup process, the cause may be faulty cables, bad connections, network outages, lack of power, and so on. Or, the phone may not be functional.
To determine whether the phone is functional, follow these suggestions to systematically eliminate these other potential problems:
1. Verify that the network port is functional:
Exchange the Ethernet cables with cables that you know are functional.
Disconnect a functioning Cisco Unified IP Phone from another port and connect it to this network port to verify the port is active.
Connect the Cisco Unified IP Phone that will not start up to a different network port that is known to be good.
Connect the Cisco Unified IP Phone that will not start up directly to the port on the switch, eliminating the patch panel connection in the office.
2. Verify that the phone is receiving power:
If you are using external power, verify that the electrical outlet is functional.
If you are using in-line power, use the external power supply instead.
If you are using the external power supply, switch with a unit that you know to be functional.
If the phone still does not start up properly, power up the phone with the handset off-hook. When the phone is powered up in this way, it attempts to launch a backup software image.
If the phone still does not start up properly, perform a factory reset of the phone. For instructions, see the “Performing a Factory Reset” section.
If after attempting these solutions, the LCD screen on the Cisco Unified IP Phone does not display any characters after at least five minutes, contact a Cisco technical support representative for additional assistance.
Link: http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7962g_7942g/6_0/english/administration/ guide/7962trb.html

An organization is using a centralized DHCP server for all IP phones. However, when the IP phones are powered up, the phones are unable to obtain an IP address. Which CLI command should be in the router configuration to ensure that the IP phones are able to reach the DHCP server?
A. router(config)# helper-address
B. router(config-if)# ip helper-address
C. router(config-if)# helper-address D. router(config)# ip helper-address
Correct Answer: B Section: CUCME Explanation
Configuring IP Helper Addresses
To configure the helper address, identify the router interface that will receive the broadcasts for UDP services. In interface configuration mode, use the ip helper-address command to define the address to which UDP broadcasts for services should be forwarded.
By default, the ip helper-address command forwards the eight UDP services listed
What if Company XYZ needs to forward requests for a service not on this list? The Cisco IOS software provides the global configuration commandip forward-protocol to allow an administrator to forward any UDP port in addition to the default eight. To forward UDP on port 517, use the global configuration command ip forward-protocol udp 517. This command is used not only to add a UDP port to the default eight, but also to subtract an unwanted service from the default group. When forwarding DHCP, TFTP, and DNS without forwarding Time, TACACS, and NetBIOS, the Cisco IOS software requires that the router be configured according to the syntax shown in Example 2-5.
Example 2-5 Forwarding UDP Services
RTA(config-if)#ip helper-address RTA(config-if)#exit RTA(config)#ip forward-protocol udp 517 RTA(config)#no ip forward-protocol udp 37 RTA(config)#no ip forward-protocol udp 49 RTA(config)#no ip forward-protocol udp 137 RTA(config)#no ip forward-protocol udp 138
Link: http://www.ciscopress.com/articles/article.asp?p=330807&seqNum=9

An engineer is troubleshooting call quality issues between central headquarters and a remote branch location. When on an active call, the engineer watches the call statistics on the IP phone and notices that the max jitter is 100 ms. What is the maximum amount of jitter that the engineer should set to maintain a high-quality call?
A. 5ms
B. 50ms
C. 10ms
D. 30ms
Correct Answer: D Section: QoS Explanation
Voice (Bearer Traffic)
The following list summarizes the key QoS requirements and recommendations for voice (bearer traffic):
Voice traffic should be marked to DSCP EF per the QoS Baseline and RFC 3246.
Loss should be no more than 1 percent.
One-way latency (mouth to ear) should be no more than 150 ms.
Average one-way jitter should be targeted at less than 30 ms.
A range of 21 to 320 kbps of guaranteed priority bandwidth is required per call (depending on the sampling rate, the VoIP codec, and Layer 2 media overhead).
Voice quality directly is affected by all three QoS quality factors: loss, latency, and jitter.
Link: http://www.ciscopress.com/articles/article.asp?p=357102

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