单选题To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）A The PRI field should contain the Cos value of 010B The PRI field shoul

第1题：

Which two statements about the DiffServ  model are true？（）

• A、a class can be identified as a single application， multiple applications with similar service needs，or be based on the source or destination IP address
• B、a drawback of the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）
• C、DiffServ uses the DiffServ field in the MAC header to mark frames into behavior
• D、the DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field
• E、the first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） value
• F、the primary goal of DiffServ is scalability

第2题：

Which two QoS classification and marking statements are true？（）

• A、 In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.
• B、 In an MPLS network， the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field
• C、 In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.
• D、 The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.
• E、 The 802.10 standard uses a three bitfield referred to as the user priority bits （PRI） to mark packets as belonging to a specific CoS.

第3题：

第4题：

You need to configure a new Company Catalyst 3560 switch for a VOIP-enabled office.  Which  three statements are true about the voice VLAN feature on this switch？（）

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

第5题：

To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）

• A、The PRI field should contain the Cos value of 010
• B、The PRI field should contain the Cos value of 011
• C、The PRI field should contain the Cos value of 100
• D、The PRI field should contain the Cos value of 101
• E、The PRI field should contain the Cos value of 110
• F、The PRI field should contain the CoS value of 111

第6题：

Which two QoS classification and marking statements are true？ （）

• A、 In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.
• B、 In an MPLS network， the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field.
• C、 In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.
• D、 The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.
• E、 The 802.1Q standard uses a three bit field referred to as the user priority bits （PRI） to mark packets as belonging to a specific CoS.

第7题：

Which two pairings match the application with the correct Cos value？（）

• A、CoS 0 = Best-Effort Data
• B、CoS 1 = Best-Effort Data
• C、CoS 3 = High Priority
• D、CoS 4 = High Priority Data
• E、CoS 5 = Voice Bearer
• F、CoS 7 = Voice Bearer

第8题：

Choose the false statement concerning the use of CiscoWorks Internetwork Performance Monitor (IPM) in a Teleworker deployment.（）

• A、IPM should not be run on a production network. 
• B、IPM helps verify if a Service Provider is meeting the Service Level Agreement. 
• C、IPM contains a database that can store data on latency, jitter, and drops of voice packets over a period of weeks or months. 
• D、The QoS service policy should contain an allocation of sufficient bandwidth in the priority queue (LLQ) for both the SAA probe simulating a voice call and the voice call. If not, voice quality will suffer.

第9题：

Which three statements about classification marking of traffic at Layer 2 are true？ （）

• A、a Frame Relay header includes a 1-bit discard eligible （DE） bit to provide the class of service （CoS）
• B、an ATM header includes a 1-bit DE field to provide the CoS
• C、an MPLS EXP field is inserted in the Layer 3 IP precedence field to identify the CoS
• D、the CoS field only exists inside Ethernet frames when 802.1Q or Inter-Switch Link （ISL） trunking is used
• E、in the IEEE 802.1p standard， three bits are used to identify the user priority bits for the CoS
• F、in the IEEE 802.1q standard， six bits are used to identify the user priority bits for the CoS

第10题：

Yuri created a formula for a button. The code is supposed to set the value of an existing field called title. He used the following formula: title:= @propercase (title); after the foumula runs ,the title field is null. Why? （）

• A、the value of one field cannot be set from the value in another field 
• B、the text string in the formula is set to null. Thus notes cannot validate the formula 
• C、when setting the value of a field , the formula must be in the field‟s input validation event 
• D、the formula does not specify that title is an existing field. Thus it is interpreted as a temporary variable