Which two statements are correct about the signaling methods that are utilized for transmitting voice？ （）A、 Channel-associated signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.B、 Channel-a

第1题：

Which two characteristics apply to a CAS T1 interface?（）

• A、signaling travels in-band 
• B、up to 24 voice channels 
• C、up to 32 voice channels 
• D、signaling travels in time slot 17 
• E、uses Q.931 signaling protocol in a common channel

第2题：

Which three statements about bidirectional PIM are true？（）

• A、Traffic for a bidirectional group flows along the one shared tree and simultaneously utilizes multiple paths in a redundant network topology
• B、It does not require any traffic signaling in the protocol
• C、Membership to a bidirectional group is signaled using explicit Join messages
• D、It maintains source-specific forwarding state
• E、It reduces memory， bandwidth， and CPU requirements

第3题：

Which two statements are true about the protocols that are used for transmitting voice traffic？（）

• A、RTP multiplexing is used to keep multiple phone conversations separate
• B、RTP provides end-to-end delivery services for voice traffic
• C、UDP is used to ensure a reliable transmission from sender to receiver
• D、RTP is used to provide resource reservation for the voice stream
• E、UDP provides multiplexing

第4题：

Which three functions are associated with a Cisco Unified CallManager？ （）

• A、 connects traditional telephony devices to voice over IP infrastructure
• B、 converts analog signals to digital format
• C、 performs voice compression
• D、 performs call processing
• E、 performs dial plan administration
• F、 performs signaling and device control

第5题：

The Cisco SDM will create a QoS policy that provides services to two types of traffic. Which two statements indicate the default QoS parameters that are created by SDM？（）

• A、 Business-critical traffic will be sorted into two QoS classes.
• B、 Real-time traffic will be sorted into one QoS class.
• C、 Voice traffic will be considered real-time traffic while call signaling will be considered business-critical.
• D、 All traffic except real-time will be considered best-effort.
• E、 Routing， management， and transactional traffic will be considered business-critical.
• F、 Voice and call signaling traffic will be considered real-time.

第6题：

Which statement is true about IP telephony calls？（）

• A、 A Voice over IP （VoIP） packet consists of the voice payload， IP header， TCP header， RTP header， and  Layer 2 link header.
• B、 The voice carrier stream uses H323 to set up， maintain， and tear down call endpoints.
• C、 Call control signaling uses Real-Time Transport Protocol （RTP） packets that contain actual voice  samples.
• D、 The sum of bandwidth necessary for each major application， including voice， video， and data， should not exceed 75 percent of the total available bandwidth for each link.

第7题：

Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true？（）

• A、the SDM QoS wizard will create two real-time traffic classes to handle VoIP， voice signaling， and video packets
• B、the SDM QoS wizard will create three real-time traffic classes to handle VoIP， voice signaling， video， and video packets
• C、the SDM QoS wizard will create four real-time traffic classes to handle VoIP， voice signaling， video， and video streaming packets
• D、the SDM QoS wizard will create two business-critical traffic classes to handle transactional and  network management packets
• E、the SDM QoS wizard will create three business-critical traffic classes to handle transactional， network management， and routing packets
• F、the SDM QoS wizard will create four business-critical traffic classes to handle transactional， network management， routing， and best-effort packets

第8题：

Which two QoS statements are true about the use of the SDMQoS wizard？（）

• 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 andIPsec 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）

第9题：

Which two statements are true about the protocols that are used for transmitting voice traffic？（）

• A、RTP multiplexing is used to keep multiple phone conversations separate
• B、RTP provides end-to-end delivery services for voice traffic.
• C、UDP is used to ensure a reliable transmission from sender to receiver.
• D、RTP is used to provide resource reservation for the voice stream.
• E、UDP provides multiplexing of multiple phone conversations.

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第13题：

Which two statements are true about voice packets in a LAN？ （Choose two.）  （）

• A、 Voice traffic data flow involves large volumes of large packets.
• B、 Because a packet loss involves a small amount of data， voice traffic is less affected by packet losses than traditional data traffic is.
• C、 Voice carrier stream utilizes Real-Time Transport Protocol （RTP） to carry the audio/media portion of VoIP communication.
• D、 Voice packets are very sensitive to delay and jitter.
• E、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.

第14题：

When Cisco SDM is used to generate QoS policy， various QoS classes will be created and assigned a percentage of the interface bandwidth. Which three statements indicate the default bandwidth values that are assigned by SDM for outgoing traffic on a WAN interface？ （）

• A、 Voice traffic will be assigned 47% of the interface bandwidth.
• B、 Voice call signaling will be assigned 33% of the interface bandwidth.
• C、 Telnet， SSH， and other traffic that is generated to manage the router is assigned 5% of the interface bandwidth.
• D、 Best-effort traffic will be assigned 38% of the interface bandwidth.
• E、 Routing protocol traffic will be assigned 5% of the interface bandwidth.
• F、 Transactional traffic will be assigned 5% of the interface bandwidth.

第15题：

Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true？ （）

• A、 The SDM QoS wizard will create two real-time traffic classes to handle VoIP and voice signaling packets.
• B、 The SDM QoS wizard will create three real-time traffic classes to handle VoIP， voice signaling， and video packets.
• C、 The SDM QoS wizard will create four real-time traffic classes to handle VoIP， voice signaling， video， and video streaming packets.
• D、 The SDM QoS wizard will create two business-critical traffic classes to handle transactional and network management packets.
• E、 The SDM QoS wizard will create three business-critical traffic classes to handle transactional， network management， and routing packets.
• F、 The SDM QoS wizard will create four business-critical traffic classes to handle transactional， network management， routing， and best-effort packets.

第16题：

When you decide on Campus QoS Design elements, which two statements correctly identify considerations to be taken into account?（）

• A、Voice needs to be assigned to the hardware priority queue.
• B、Voice needs to be assigned to the software priority queue.
• C、Call signaling must have guaranteed bandwidth service.
• D、Strict-priority queuing should be limited to 50 percent of the capacity of the link.

第17题：

Which two statements correctly identify considerations to take into account when deciding onCampus QoS Design elements？ （）

• A、 Voice needs to be assigned to the hardware priority queue
• B、 Voice needs to be assigned to the software priority queue
• C、 Call signaling must have guaranteed bandwidth service
• D、 Strict-priority queuing should be limited to 50 percent of the capacity of the link
• E、 At least 33 percent or the link bandwidth should be reserved tor default best effort class

第18题：

Which two statements are true about the digital audio in a VoIP network？ （）

• 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.

第19题：

Which two statements correctly identify factors to consider when Configuring WAN QoS？（）

• A、Voice Traffic uses Assured Forwarding
• B、Voice Signaling traffic uses Assured Forwarding
• C、Voice Signaling traffic uses priority queuing
• D、Voice Traffic uses priority queuing
• E、Voice signaling traffic should use priority queuing with Assured Forwarding

第20题：

Which two statements are true about the function of CAC？（）

• 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.

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