多选题In which two ways can you influence how downstream LSRs treat MPLS traffic？（）AUse an EXP rewrite table.BUse a DSCP rewrite table.CStatically assign a CoS value to an LDP-signaled LSPDStatically assign a CoS value to an RSVP-signlated LSP

第1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2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3题：

第4题：

In which two ways can the router ID selection be controlled？（）

• A、Manually assign RID
• B、Configure local-address
• C、Enable the fxp0 interface
• D、Assign nonmartian address to lo0.

第5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 802.10 standard uses a three bitfield referred to as the user priority bits （PRI） to mark packets as belonging to a specific CoS.

第7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8题：

第9题：

In which two ways can you influence how downstream LSRs treat MPLS traffic？（）

• A、Use an EXP rewrite table.
• B、Use a DSCP rewrite table.
• C、Statically assign a CoS value to an LDP-signaled LSP
• D、Statically assign a CoS value to an RSVP-signlated LSP

第10题：

In which two ways can the router ID selection be controlled?（）

• A、Manually assign rid.
• B、configure local-address.
• C、enable the fxp0 interface.
• D、Assign nonmartian address to lo0.