classification（）

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.

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.

A . the openness of the mouth B . the position of the tongue C . the shape of the tip D . the width of the vowel

A . Class 8 B . Class 3 - flammable liquid C . Division 2.2 - nonflammable gas D . All of the above are correct

A . Bureau of Shipping B . National Cargo Bureau C . Port Authorities D . The Custom

A . water-tube supercritical circulation B . water-tube forced circulation C . fire-tube controlled circulation D . fire-tube express circulatio

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

A . Resource Reservation Protocol （RSVP） B . IP precedence C . traffic shaping D . trust boundaries E . DSCP F . applicatio

A . fire-tube controlled circulation B . fire-tube supercritical circulation C . water-tube natural circulation D . water-tube express circulatio

A . periodic survey B . statutory survey C . additional survey D . annual survey

A Management B Buying C Follow-up and expediting D Marketing E Clerical

A:对 B:错

A．emphasize the relationships of all the categories B．reinforce the subject and make some personal suggestions C．define the feature of each category D．Both A and B