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QUESTION 50
Which two statements are true about the digital audio in a VoIP network? (Choose two.)
A. Standard encoding techniques create an uncompressed digital data rate of 4000 bps.
B. Standard encoding techniques create an uncompressed digital data rate of 8000 bps.
C. Standard encoding techniques create an uncompressed digital data rate of 64,000 bps.
D. Voice quality is not a concern if compression is not used.
E. Two methods of quantization are linear and logarithmic.
F. Two methods of compression are u-law and a-law .
Correct Answer: CE Section: (none) Explanation
Explanation/Reference:
QUESTION 51
Which statement is true about Foreign Exchange Station (FXS) ports on a router?
A. The FXS interface allows an analog connection to be directed at the public switched telephone network (PSTN’s) central office.
B. The FXS interface connects directly to a standard telephone, fax machine, or similar device and supplies ring, voltage, and dial tone.
C. The FXS interface connects directly to an IP phone and supplies ring, voltage, and dial tone.
D. The FXS interface connects directly to ISDN voice channels.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 52
For defining the QoS policies for each traffic class, which parameters should be identified? (Choose three.)
A. minimum bandwidth guarantee
B. average bandwidth guarantee
C. optimum bandwidth guarantee
D. maximum bandwidth rate
E. IP precedence
F. priority
Correct Answer: ADF Section: (none) Explanation
Explanation/Reference:
QUESTION 53
Which two statements are true about CAC? (Choose two.)
A. CAC is implemented in the call setup phase to allocate bandwidth resources.
B. CAC is implemented in the call maintenance phase to allocate bandwidth resources.
C. CAC is utilized during the call teardown phase to ensure that all resources have been released.
D. CAC uses the Cisco RSVP (Resource Reservation Protocol) Agent to integrate call-processing capabilities with the underlying network infrastructure.
E. CAC is implemented in the call setup phase to determine the destination of the call.
Correct Answer: AD Section: (none) Explanation
Explanation/Reference:
QUESTION 54
Drop A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
QUESTION 55
Which two statements about the best effort model for QoS are true? (Choose two.)
A. Delay sensitive packets are given preferential treatment.
B. The default policy identifies a delay sensitive class and a default class.
C. The default policy identifies a delay sensitive class, best effort class, and a default class.
D. The model is highly scalable.
E. The model is still predominant on the Internet.
F. The model provides guaranteed service.
Correct Answer: DE Section: (none) Explanation Explanation/Reference:
QUESTION 56
What is the best description of serialization delay?
A. the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interface
B. the time it takes for a packet to propagate from source to destination
C. the time it takes to place a frame on the physical medium for transport
D. the time a packet resides in the outbound queue of a router
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 57
What is a drawback to using the IntServ model?
A. RSVP that signals QoS requests per individual flow
B. not scalable to large implementations
C. admission control not supported
D. use of dynamic port numbers
E. UDP not supported
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 58
Which two Cisco Wireless Control System (WCS) statements are true? (Choose two.)
A. The WCS Base version includes all the features of the WCS Location version as well as additional enhancements.
B. The WCS Base version provides on-demand location of rogue access points and clients to within 33 feet (10 meters).
C. WCS adds a graphical view of multiple Cisco Wireless LAN controllers and managed access points.
D. WCS includes a network management tool which is similar to a site survey tool.
E. WCS uses the CDP protocol to communicate with the controllers.
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
QUESTION 59
Drop A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
QUESTION 60
Acme Company has several offices around the country. The company has deployed a VoIP network with Cisco Unified CallManager in a multisite centralized configuration but there is a requirement to place a call agent at some of the remote sites. Which IOS gateway feature should be deployed at the remote site to enable local call control?
A. Gatekeeper multizone
B. Call Admission Control (CAC)
C. Automatic Alternate Routing (AAR)
D. Survivable Remote Site Telephony (SRST)
E. Cisco Unified CallManager Express (CME)
Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 61
What is the purpose of the NBAR protocol discovery?
A. to build a Packet Description Language Module (PDLM) file to be used in protocol matching
B. to discover applications and build class maps for data classification
C. to look into the TCP or UDP payload and classify packets based on the content
D. to build a database of all application data that passes through the router and queue the data accordingly
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 62
Which statement is true about the distributed call control in a VoIP network?
A. The VoIP endpoints have the intelligence to set up and control calls.
B. Call setup and control functionality is centralized in one call agent or cluster.
C. Call setup and control resides in call agents that are distributed throughout the network.
D. Each VoIP device has separate call control, voice packetization, and transport mechanisms.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 63
When analog signals are digitized using the G.711 codec, voice samples are encapsulated into protocol data units (PDUs) involving which three headers? (Choose three.)
A. IP
B. TCP
C. RTP
D. UDP
E. H.323
F. cRTP
Correct Answer: ACD Section: (none) Explanation
Explanation/Reference:
QUESTION 64
What are three features of voice traffic on a network? (Choose three.)
A. bursty
B. constant
C. bandwidth intensive
D. small packet sizes
E. time-sensitive
F. retransmittable
Correct Answer: BDE Section: (none) Explanation
Explanation/Reference:
QUESTION 65
What are two steps that are taken when a router converts a voice signal from analog to digital form? (Choose two.)
A. sampling
B. packetization
C. quantization
D. serialization
Correct Answer: AC Section: (none) Explanation
Explanation/Reference:
QUESTION 66
Voice activity detection (VAD) suppresses the transmission of silence patterns.
On average, and assuming that a link carries at least 24 calls, what percentage of total bandwidth could VAD save?
A. 5
B. 15
C. 25
D. 35
E. 45
F. 55
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 67
Drop A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
QUESTION 68
Which two statements about the open and shared key wireless-authentication methods are true? (Choose two.)
A. Shared key authentication is considered more secure than open authentication.
B. Shared key authentication is considered less secure than open authentication.
C. If the WEP keys do not match using the open authentication method, the client will not authenticate, associate, and transfer data.
D. If the WEP keys do not match using the open authentication method, the client will still be able to authenticate and associate, but will not transfer data.
E. If the WEP keys do not match using the open authentication method, the client will still be able to authenticate, associate, and transfer data.
Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
QUESTION 69
Which certification-based protocol is implemented for wireless QoS between an AP and a wireless client over RF media?
A. WMM using DCF
B. WMM using EDCAF
C. 802.1e using DCF
D. 802.1e using EDCAF
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 70
Refer to the exhibit. What variation of the 802.1x Extensible Authentication Protocol (EAP) uses this authentication process?
A. LEAP
B. EAP-FAST
C. PEAP
D. EAP-TLS
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 71
Which two statements are true about RSVP and the IntServ QoS model? (Choose two.)
A. A drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol.
B. RSVP uses DSCP to signal QoS requirements to routers.
C. RSVP is a routing protocol.
D. RSVP is an IP protocol that uses IP protocol ID 46, and TCP/UDP ports 3455.
E. RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic.
F. The flow-based approach of RSVP is ideal for large, scalable implementations such as the public Internet.
Correct Answer: DE Section: (none) Explanation
Explanation/Reference:
QUESTION 72
Which two statements are true about the function of CAC? (Choose two.)
A. CAC provides guaranteed voice quality on a link.
B. CAC artificially limits the number of concurrent voice calls.
C. CAC is used to control the amount of bandwidth that is taken by a call on a link.
D. CAC prevents oversubscription of WAN resources that is caused by too much voice traffic.
E. CAC allows an unlimited number of voice calls while severely restricting, if necessary, other forms of traffic.
F. CAC solves voice congestion problems by using QoS to give priority to UDP traffic.
Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
QUESTION 73
Drop A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
QUESTION 74
What are two QoS mechanisms that are used to prevent packet loss? (Choose two.)
A. header compression
B. payload compression
C. low latency queuing (LLQ)
D. weighted random early detection (WRED)
E. traffic policing
F. traffic shaping
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
QUESTION 75
Which three statements are true about the data traffic characteristics of voice traffic? (Choose three.)
A. Latency must be kept below 150 ms.
B. Latency is not a concern as long as jitter is kept below 30 ms.
C. Voice packets do not require a specific type of queuing.
D. Voice packets are rather small
E. Voice packets require TCP for rapid retransmission of dropped packets.
F. Voice packets require a fairly constant bandwidth reserved for voice control traffic as well as for the voice payload.
Correct Answer: ADF Section: (none) Explanation
Explanation/Reference:
QUESTION 76
What are three types of packet delays that occur in a network? (Choose three.)
A. timing
B. queuing
C. differential
D. serialization
E. packetization
F. propagation
Correct Answer: BDF Section: (none) Explanation
Explanation/Reference:
QUESTION 77
What is true about Quality of Service (QoS) for VPNs?
A. QoS preclassification is only supported on generic routing encapsulation (GRE) and IPsec VPNs.
B. QoS preclassification is not required in Layer 2 Tunneling Protocol (L2TP), Layer 2 Forwarding (L2F), and Point-to-Point Tunneling Protocol (PPTP) VPNs.
C. QoS preclassification is supported on IPsec AH VPNs, but not on IPsec ESP VPNs.
D. The QoS-for-VPNs feature (QoS preclassification) is designed for VPN transport interfaces.
E. With IPsec tunnel mode, the type of service (ToS) byte value is copied automatically from the original IP header to the tunnel header.
Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 78
Which three traffic descriptors are typically used as QoS markings for packets or frames entering the network? (Choose three.)
A. protocol type
B. CoS
C. DSCP
D. IP precedence
E. destination address
F. input interface
Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
QUESTION 79
Which two features are supported by the WLAN Solution Engine (WLSE)? (Choose two.)
A. configuration of APs
B. auto discovery of rogue APs
C. reporting
D. WLSE in two versions: base and location
E. graphical view of multiple controllers and managed APs
Correct Answer: AC Section: (none) Explanation
Explanation/Reference:
QUESTION 80
Which two QoS statements are true about the use of the SDM QoS wizard? (Choose two.)
A. Business-critical traffic includes VoIP and voice signaling packets.
B. SDM can be used to configure a basic QoS policy for incoming traffic on WAN interfaces and IPsec tunnels.
C. SDM can provide QoS for real-time traffic and business-critical traffic.
D. SDM creates a custom-queuing (CQ) or a priority-queuing (PQ) policy.
E. SDM creates a low latency queuing (LLQ) service policy with its associated classes.
F. When allocating bandwidth, values can be entered in either bandwidth percentage or kilobytes per second (kBps).
Correct Answer: CE Section: (none) Explanation
Explanation/Reference:
QUESTION 81
A branch office of Acme Insurance has 15 IP phones connected to the main office using the distributed call processing model. Normally, the phones work with great quality.
However, during very busy times when all of the agents are on the phone at the same time, the voice quality drops precipitously. Words or phrases or both are dropped from conversations. What is the most likely cause of the problem?
A. Large files are being downloaded over the WAN network.
B. IP phone traffic is not being classified correctly.
C. More bandwidth is required for the office LAN.
D. Call Admission Control has not been implemented.
E. Employees are watching videos over the Internet.
F. Header compression is not being used.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 82
What two steps need to be taken in deploying AutoQoS for Enterprise on routers? (Choose two.)
A. Provide visibility into the classes of service deployed using system logging and SNMP traps.
B. Determine WAN settings for fragmentation, compression, encapsulation, and Frame Relay-ATM interworking.
C. Enable the AutoQoS VoIP for voice traffic.
D. Generate and deploy MQC-based QoS policies.
E. Profile the traffic with Auto-Discovery.
Correct Answer: DE Section: (none) Explanation
Explanation/Reference:
QUESTION 83
When a router converts analog signals to digital signals, what three steps are always included in the process? (Choose three.)
A. involution
B. encoding
C. sampling
D. quantization
E. compression
F. companding
Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
QUESTION 84
Which two Cisco AutoQoS configuration statements are true? (Choose two.)
A. The auto discovery qos command is supported on serial interfaces, subinterfaces, and virtual interfaces.
B. CEF must be enabled before configuring the auto discovery qos command.
C. The auto discovery qos privilege EXEC command must be configured on a router for several days to collect a sampling of data traffic.
D. The auto qos trust command relies on NBAR to provide VoIP classification.
E. The auto qos voip command configures the VoIP classification on routers and switches.
Correct Answer: BE Section: (none) Explanation
Explanation/Reference:
QUESTION 85
Which two statements are true about the various methods of implementing QoS? (Choose two.)
A. Cisco AutoQoS can be used repeatedly to apply a single QoS policy to multiple interfaces.
B. Cisco AutoQoS includes an optional web-based GUI for automating the configuration of QoS services.
C. Cisco AutoQoS provides capabilities to automate VoIP deployments.
D. The auto qos global configuration command is used to configure Cisco AutoQoS.
E. The Modular QoS CLI (MQC) is the best way to fine tune QoS configurations.
F. The SDM QoS wizard is the fastest way to implement QoS.
Correct Answer: CE Section: (none) Explanation
Explanation/Reference:
QUESTION 86
Which three devices are used by the Cisco Wireless Control System (WCS) for wireless management? (Choose three.)
A. WLAN controllers
B. WLAN Solution Engine (WLSE)
C. Cisco Wireless Control System (WCS)
D. Cisco Wireless Location Appliance
E. lightweight access point (AP)
F. autonomous access point (AP)
Correct Answer: ADE Section: (none) Explanation
Explanation/Reference:
QUESTION 87
What are two characteristics of the DiffServ model? (Choose two.)
A. service guarantee
B. traffic that is divided into classes
C. not scalable to large implementations
D. QoS mechanisms that are used without prior signaling
E. applications that signal their particular QoS and bandwidth requirements
Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
QUESTION 88
Refer to the exhibit. What needs to be selected to view the status of an individual wireless controller?
A. the IP Address link
B. the IP address of the controller
C. the Controller Name link
D. the Reachability Status link
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 89
Which three pieces of information are used to calculate the total bandwidth of a VoIP call? (Choose three.)
A. the packetization size
B. the serialization of the interface
C. the quantization
D. the packet rate
E. the UDP overhead
F. the TCP overhead
Correct Answer: ADE Section: (none) Explanation
Explanation/Reference:
QUESTION 90
Which two wireless security statements are true? (Choose two.)
A. A TACACS+ server is required to implement 802.1x.
B. MIC protects against man-in-the-middle and replay attacks.
C. The 802.1x standard provides encryption services for wireless clients.
D. The AES (symmetric block cipher) is specified in the IEEE 802.11i specification.
E. The IEEE 802.11i specification uses RC4 as its encryption mechanism.
F. WPA requires TKIP and AES as encryption methods.
Correct Answer: BD Section: (none) Explanation
Explanation/Reference: QUESTION 91
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