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多选题
Which 4 statements regarding MPLS Label Stack Encoding is true？（）
A
A value of 4 represents the Implicit NULL Label.
B
A value of 0 represents the IPv4 Explicit NULL Label.
C
A value of 1 represents the Router Alert Label. The use of this label is analogous to the use of theRouter Alert Option in IP packets （for example， ping with record route option）
D
A value of 2 represents the IPv6 Explicit NULL Label
E
A value of 1 represents the IPv1 Explicit NULL Label
F
A value of 3 represents the Implicit NULL Label
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更多 “多选题Which 4 statements regarding MPLS Label Stack Encoding is true？（）AA value of 4 represents the Implicit NULL Label.BA value of 0 represents the IPv4 Explicit NULL Label.CA value of 1 represents the Router Alert Label. The use of this label is analogous to the use of theRouter Alert Option in IP packets （for example， ping with record route option）DA value of 2 represents the IPv6 Explicit NULL LabelEA value of 1 represents the IPv1 Explicit NULL LabelFA value of 3 represents the Implicit NULL Label” 相关考题
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Which two statements are correct regarding MPLS LSP establishment methods?() (Choose two.)
A. LDP uses Down Stream On Demand.B. RSVP uses Down Stream On Demand.C. LDP uses Down Stream Unsolicited.D. RSVP uses Down Stream Unsolicited.
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在MPLS网络中的路由器接收到带label的数据包，它如何判断数据包是否有多于一层的label（）。A、bottom-of-stack位为1，则还有labelB、bottom-of-stack位为0，则还有labelC、MPLS网络中的路由器无法判断是否还有更多labelD、在MPLS网络中，数据包不可能带超过一层的label
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Which 4 statements regarding MPLS Label Stack Encoding is true？（）A、A value of 4 represents the "Implicit NULL Label."B、A value of 0 represents the "IPv4 Explicit NULL Label."C、A value of 1 represents the "Router Alert Label". The use of this label is analogous to the use of the"Router Alert Option" in IP packets （for example， ping with record route option）D、A value of 2 represents the "IPv6 Explicit NULL Label"E、A value of 1 represents the "IPv1 Explicit NULL Label"F、A value of 3 represents the "Implicit NULL Label"
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What are the four fields in an MPLS label？（）A、versionB、experimentalC、labelD、protocolE、TTLF、bottom-of-stack indicato
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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
考题
Which of the following is true regarding Label Distribution Protocol （LDP）？（）A、It is a label distribution protocol for MPLSB、It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a networkC、Tag distribution Protocol （TDP） was the basis for LDPD、All of the above are true
考题
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
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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Which four services use the inner labels of an MPLS label stack？ （）A、MPLS VPNB、switching path in MPLS coreC、Cisco MPLS Traffic Engineering and Fast RerouteD、MPLS over ATME、VPN over Traffic Engineering coreF、any transport over MPLS
考题
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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Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label， if the stack bit is set to1， which option is true？（）A、The stack bit will only be used when LDP is the label distribution protocolB、The label is the last entry in the label stack.C、The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol.D、The stack bit is reserved for future use.
考题
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 two statements are true regarding the use of UTF-16 encoding？ （）AEnables easier loading of multinational data.BUses a fixed-width Multibyte encoding sequence.CAsian characters are represented in three characters.DUsed a variable-width Multibyte encoding sequence.EEuropean characters are represented on one or two bytes.
考题
单选题Which option describes the incorrect usage of the Label Distribution method？（）A
LDP is primarily used in internal networks of MPLS-VPN providers.B
MP-BGP is used for label distribution for VPN customer routes.C
Directed LDP is used for label distribution in L2-VPN Attachement Circuits.D
MP-BGP is used for label distribution in MPLS Traffic Engineered networks.
考题
多选题Which two statements are correct regarding MPLS LSP establishment methods?（） (Choose two.)ALDP uses Down Stream On Demand.BRSVP uses Down Stream On Demand.CLDP uses Down Stream Unsolicited.DRSVP uses Down Stream Unsolicited.
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多选题Which two statements about MPLS label-switched paths (LSPs) are true? （）ALSPs are bidirectional.BLSPs are unidirectional.CLSPs must follow the IGP's shortest path.DLSPs can follow paths other than the IGP's shortest path.
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多选题Which four services use the inner labels of an MPLS label stack？ （）AMPLS VPNBswitching path in MPLS coreCCisco MPLS Traffic Engineering and Fast RerouteDMPLS over ATMEVPN over Traffic Engineering coreFany transport over MPLS
考题
多选题What are the four fields in an MPLS label？（）AversionBexperimentalClabelDprotocolETTLFbottom-of-stack indicato
考题
单选题Which of the following is true regarding Label Distribution Protocol （LDP）？（）A
It is a label distribution protocol for MPLSB
It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a networkC
Tag distribution Protocol （TDP） was the basis for LDPD
All of the above are true
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
考题
单选题Multi Protocol Label Switching （MPLS） is a data-carrying mechanism that belongs to the family of packet-switched networks. For an MPLS label， if the stack bit is set to1， which option is true？（）A
The stack bit will only be used when LDP is the label distribution protocolB
The label is the last entry in the label stack.C
The stack bit is for Cisco implementations exclusively and will only be used when TDP is the label distribution protocol.D
The stack bit is reserved for future use.
考题
多选题Which 4 statements regarding MPLS Label Stack Encoding is true？（）AA value of 4 represents the Implicit NULL Label.BA value of 0 represents the IPv4 Explicit NULL Label.CA value of 1 represents the Router Alert Label. The use of this label is analogous to the use of theRouter Alert Option in IP packets （for example， ping with record route option）DA value of 2 represents the IPv6 Explicit NULL LabelEA value of 1 represents the IPv1 Explicit NULL LabelFA value of 3 represents the Implicit NULL Label
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