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单选题
In a frame ，the MPLS label is imposed（）.
A
After the Layer3 header and before Layer2 header
B
After the Layer2 header and before Layer3 header
C
Within the Layer 3 header
D
Before the layer 2 header
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在MPLS中,LDP的具体解释()。
A.Label Data PairB.Label Distribution PairC.Label Distribution ProtocolD.Label Data Protocol
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Which three of the following steps are mandatory when configuring MPLS on Cisco IOS? ()(Choose three.)
A. start LDPB. enable CEF switchingC. configure the MPLS IDD. disable IP TTL propagationE. configure conditional label advertisingF. enable label switching on frame mode interfaces
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Why is it appropriate to use conditional label advertising when deploying MPLS? ()
A. to make CEF tables smallerB. to enable label switching on the frame mode interfaceC. to restrict MPLS availability to predefined time periodsD. to restrict label switching to a limited number of networksE. to restrict end users from seeing the routers in the MPLS network
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Why is it appropriate to use conditional label advertising when deploying MPLS? （）A、to make CEF tables smallerB、to enable label switching on the frame mode interfaceC、to restrict MPLS availability to predefined time periodsD、to restrict label switching to a limited number of networksE、to restrict end users from seeing the routers in the MPLS network
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There is MPLS VPN traffic traversing through a TE intermediate router. What is the MPLS packet labelstack sequence （from outer to inner） for the VPN traffic on this router？（）A、TE label， IGP label， VPN labelB、IGP label， TE label， VPN labelC、TE label， VPN label， IGP labelD、VPN label， IGP label， TE labelE、IGP label， VPN label， TE label
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In the context of MPLS，what is the correct action to be performed when an aggregate label is received ？（）A、It adds the VPN label into the top label in the MPLS label stackB、It replaces the top label in the MPLS label stack with a VPN label and propagatesC、It replaces the bottom label in the MPLS label stack with a VPN label and propagatesD、It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packetsE、None of above
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As a network administrator, you are required to deploy MPLS technology. During the deployment, it is recommended to apply conditional label advertising. What is most probably the reason for that?（）A、to enable label switching on the frame mode interfaceB、to restrict MPLS availability to predefined time periodsC、to restrict end users from seeing the routers in the MPLS networkD、to restrict label switching to a limited number of networks
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Using more than one label on a single packet is required in what context？（）A、MPLS TEB、MPLS VPNC、When CEF switching and Label switching is doneD、In all the above circumstances
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What is the action of "pop" in the context of MPLS switching？（）A、It removes the top label in the MPLS label stack.B、It adds a top label in MPLS label stack.C、It replaces the top label in the MPLS label stack with another value.D、It replaces the top label in the MPLS label stack with a set of labels.E、None of above.
考题
在MPLS中，LDP的具体解释（）。A、Label Data PairB、Label Distribution PairC、Label Distribution ProtocolD、Label Data Protocol
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Cisco IOS is the software used on the vast majority of Cisco Systems routers and current Cisco network switches. As a network administrator, you are required to configure MPLS on Cisco IOS. In such a situation, which three of the following steps are necessary to take?（）A、Start LDP.B、Enable CEF switching.C、Configure conditional label advertising.D、Enable label switching on frame mode interfaces.E、disable IP TTL propagationF、configure conditional label advertising
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Which three of the following steps are mandatory when configuring MPLS on Cisco IOS? （）(Choose three.)A、start LDPB、enable CEF switchingC、configure the MPLS IDD、disable IP TTL propagationE、configure conditional label advertisingF、enable label switching on frame mode interfaces
考题
Which three MPLS statements are true？（）A、Cisco Express Forwarding （CEF） must be enabled as a prerequisite to running MPLS on a Cisco router.B、Frame-mode MPLS inserts a 32-bit label between the Layer 3 and Layer 4 headers.C、MPLS is designed for use with frame-based Layer 2 encapsulation protocols such as Frame Relay， but is not supported by ATM because of ATM fixed-length cells.D、OSPF， EIGRP， IS-IS， RIP， and BGP can be used in the control plane.E、The control plane is responsible for forwarding packets.F、The two major components of MPLS include the control plane and the data plane.
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Where is the MPLS label imposed？（）A、after the Layer 3 header and before the Layer 2 payloadB、after the Layer 3 header and before the Layer 4 payloadC、after the Layer 2 header and before the Layer 1 payloadD、after the Layer 1 header and before the Layer 2 payloadE、after the Layer 2 header and before the Layer 3 payload
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In which three network technologies is traffic shaping used to prevent and manage congestion？ （）A、Asynchronous Transfer Mode （ATM）B、data-link switching （DLSw）C、Route Processor Redundancy （RPR）D、Frame Relay （FR）E、Metro EthernetF、Multiprotocol Label Switching （MPLS）
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In Any Transport over MPLS （AtoM） Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet， where is this Control Word inserted？（）A、Inserted between the MPLS label stack and the Layer 3 payloadB、Inserted between the MPLS label stack and the Layer 3 HeaderC、Inserted between the MPLS label stack and the Layer 2 payloadD、Inserted between the MPLS label stack and the Layer 2 header
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MPLS label mapping on an LSR is displayed by which IOS command？（）A、Show mpls Idp neighbor detailB、Show mpls Idp bindingsC、Show mpls Idp parametersD、Show mpls Idp discovery
考题
多选题Which three MPLS statements are true？（）ACisco Express Forwarding （CEF） must be enabled as a prerequisite to running MPLS on a Cisco router.BFrame-mode MPLS inserts a 32-bit label between the Layer 3 and Layer 4 headers.CMPLS is designed for use with frame-based Layer 2 encapsulation protocols such as Frame Relay， but is not supported by ATM because of ATM fixed-length cells.DOSPF， EIGRP， IS-IS， RIP， and BGP can be used in the control plane.EThe control plane is responsible for forwarding packets.FThe two major components of MPLS include the control plane and the data plane.
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单选题There is MPLS VPN traffic traversing through a TE intermediate router. What is the MPLS packet labelstack sequence （from outer to inner） for the VPN traffic on this router？（）A
TE label， IGP label， VPN labelB
IGP label， TE label， VPN labelC
TE label， VPN label， IGP labelD
VPN label， IGP label， TE labelE
IGP label， VPN label， TE label
考题
多选题Cisco IOS is the software used on the vast majority of Cisco Systems routers and current Cisco network switches. As a network administrator, you are required to configure MPLS on Cisco IOS. In such a situation, which three of the following steps are necessary to take?（）AStart LDP.BEnable CEF switching.CConfigure conditional label advertising.DEnable label switching on frame mode interfaces.Edisable IP TTL propagationFconfigure conditional label advertising
考题
单选题Why is it appropriate to use conditional label advertising when deploying MPLS?（）A
to make CEF tables smallerB
to enable label switching on the frame mode interfaceC
to restrict MPLS availability to predefined time periodsD
to restrict label switching to a limited number of networksE
to restrict end users from seeing the routers in the MPLS network
考题
单选题As a network administrator, you are required to deploy MPLS technology. During the deployment, it is recommended to apply conditional label advertising. What is most probably the reason for that?（）A
to enable label switching on the frame mode interfaceB
to restrict MPLS availability to predefined time periodsC
to restrict end users from seeing the routers in the MPLS networkD
to restrict label switching to a limited number of networks
考题
单选题Where is the MPLS label imposed？（）A
after the Layer 3 header and before the Layer 2 payloadB
after the Layer 3 header and before the Layer 4 payloadC
after the Layer 2 header and before the Layer 1 payloadD
after the Layer 1 header and before the Layer 2 payloadE
after the Layer 2 header and before the Layer 3 payload
考题
单选题What is the action of "pop" in the context of MPLS switching？（）A
It removes the top label in the MPLS label stack.B
It adds a top label in MPLS label stack.C
It replaces the top label in the MPLS label stack with another value.D
It replaces the top label in the MPLS label stack with a set of labels.E
None of above.
考题
单选题In the context of MPLS，what is the correct action to be performed when an aggregate label is received ？（）A
It adds the VPN label into the top label in the MPLS label stackB
It replaces the top label in the MPLS label stack with a VPN label and propagatesC
It replaces the bottom label in the MPLS label stack with a VPN label and propagatesD
It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packetsE
None of above
考题
多选题Which three of the following steps are mandatory when configuring MPLS on Cisco IOS?（）(Choose three.)Astart LDPBenable CEF switchingCconfigure the MPLS IDDdisable IP TTL propagationEconfigure conditional label advertisingFenable label switching on frame mode interfaces
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