多选题Which three are characteristics of voice traffic in the Company VOIP campus network？（）ATCP retransmitsBUDP priorityCBurstyDDelay sensitiveEGreedyFDrop sensitive

第1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2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3题：

第4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5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6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7题：

Which three characteristics are indicators that a potential SMB customer is in the SBR-defined growth phase? （）

• A、focusing on becoming more efficient
• B、wanting greater connectivity for customers
• C、requesting convergence of voice and data
• D、providing a customer with a basic up-to-date website
• E、needing rapid secure access to customer history, data, or buying behavior

第8题：

第9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10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.