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多选题
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.
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更多 “多选题Which two QoS classification and marking statements are true？ （）AIn a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.BIn 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.CIn an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.DThe differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.EThe 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.” 相关考题
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Which two statements or sets of statements are true about the application of the qos pre-classify command？（）A、 If the classification policy is based upon the ToS byte， the qos pre-classify command is required because the ToS byte only appears in the inner IP header.B、 The ToS byte is copied to the outer header by default. Therefore， the qos pre-classify command is not necessary.C、 With GRE encapsulation， the qos pre-classify command is applied on the tunnel interface. This practice allows for different OoS configurations on each tunnel.D、 With GRE encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.E、 With IPsec encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.
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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.
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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 fieldC、 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.
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多选题Which two statements about the best effort model for QoS are true？（）Adelay sensitive packets are given preferential treatmentBthe default policy identifies a delay sensitive class and default classCthe default policy identifies a delay sensitive class， best effort class， and default classDthe model is highly scalableEthe model is still predominant on the internet F the model provides guaranteed service
考题
多选题Which two statements or sets of statements are true about the application of the qos pre-classify command？（）AIf the classification policy is based upon the ToS byte， the qos pre-classify command is required because the ToS byte only appears in the inner IP header.BThe ToS byte is copied to the outer header by default. Therefore， the qos pre-classify command is not necessary.CWith GRE encapsulation， the qos pre-classify command is applied on the tunnel interface. This practice allows for different OoS configurations on each tunnel.DWith GRE encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.EWith IPsec encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.
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多选题Which two statements are true about traffic shaping and traffic policing？（）Aboth traffic shaping and traffic policing cause retransmissions of connection-oriented protocols such as TCPBboth traffic shaping and traffic policing support the marking and re-marking of trafficCthe effects of traffic shaping and traffic policing when configured on a router are applied to outgoing trafficDtraffic shaping queues excess traffic whereas traffic policing discards excess trafficEtraffic shaping allows the traffic to exceed the bit rate whereas traffic policing prevents the traffic from exceeding the bit rate
考题
多选题Which two statements are true about Unicast Reverse Path Forwarding Loose Mode？（）AIt is used in multihome network scenarios.BIt can be used with BGP to mitigate DoS and DDoS.CIt does not need to have CEF enabled.DIt is enabled via the interface level command ip verify unicast reverse-path.EIt cannot be used with classification access lists.
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