Which three characteristics are true about voice traffic in 

第1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2题：

Which three are characteristics of voice traffic in the Company VOIP campus network？（）

• A、TCP retransmits
• B、UDP priority
• C、Bursty
• D、Delay sensitive
• E、Greedy
• F、Drop sensitive

第3题：

Which three statements are true about the data traffic characteristics of voice traffic？ （）

• 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 forthe voice payload

第4题：

Which statement is true about voice VLANs？ （）

• A、When the voice VLAN feature is enabled， all untagged voice and data traffic is sent through the voice VLAN.
• B、The voice VLAN feature is enabled by default.
• C、The IP phone overrides the priority of all incoming data traffic （tagged and untagged） and sets the CoS value to 0.
• D、The default CoS value is 1 for incoming voice and data traffic.

第5题：

Which statement is true about the comparison of voice traffic with video traffic？（）

• A、video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows
• B、latency requirements are less stringent for video traffic than for voice traffic
• C、video traffic is less sensitive to dropped packets than for voice traffic
• D、video traffic requires the retransmission capabilities of TCP whereas voice uses UDP
• E、video traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows
• F、voice traffic requires the retransmission capabilities of TCP whereas video uses UDP

第6题：

Which statement is true about the comparison of voice traffic with video traffic？（）

• A、 Video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
• B、 Latency requirements are less stringent for video traffic than for voice traffic.
• C、 Video traffic is less sensitive to dropped packets than for voice traffic.
• D、 Video traffic requires the retransmission capabilities of TCP whereas voice uses UDP.
• E、 Voice traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
• F、 Voice traffic requires the retransmission capabilities of TCP whereas video uses UDP.

第7题：

VOIP has been implemented at the main office of the Company network. Which two statements  are true about voice packets in a LAN？（）

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

第8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9题：

Which three statements are true about the voice VLAN feature on a Catalyst 2950 switch？ （Choose  three.）（）  

• A、 The CoS value is trusted for 802.1p or 802.1q tagged traffic.
• B、 The voice VLAN feature is disabled by default.
• C、 The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.
• D、 When the voice VLAN feature is enabled， all untagged traffic is sent according to the default CoS priority of the port.
• E、 PortFast is automatically disabled when a voice VLAN is configured.
• F、 The default CoS value for incoming traffic is set to 0.

第10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