How many bits does EXP occupy in the MPLS label header？（）A、8B、4C、3D、1E、2
How many bits does EXP occupy in the MPLS label header？（）
- A、8
- B、4
- C、3
- D、1
- E、2
相关考题：
A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?() A. It performs a label pop operation and an IP lookup.B. It performs a label swap operation and an IP lookup.C. It sends an error message toward the egress router.D. It sends an error message toward the ingress router.
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.
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.
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
In a frame ，the MPLS label is imposed（）.A、After the Layer3 header and before Layer2 headerB、After the Layer2 header and before Layer3 headerC、Within the Layer 3 headerD、Before the layer 2 header
A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?（）A、It performs a label pop operation and an IP lookup.B、It performs a label swap operation and an IP lookup.C、It sends an error message toward the egress router.D、It sends an error message toward the ingress router.
Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）A、The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSRB、TTL propagation cannot be disabled in an MPLS domainC、TTL propagation is only disabled on the ingress edge LSRD、The TTL field of the MPLS label header is set to 255E、The TTL field of the IP packet is set to 0
How many simultaneous Telnet sessions does a Cisco router support by default?（）A、1B、2C、3D、4E、5F、6
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
As a CCNA candidate,you must have a firm understanding of the IPv6 address structure.Refer to IPv6 address,could you tell me how many bits are included in each filed?（）A、24B、4C、3D、16
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
Which of the following is true about the MPLS header and its EXP field size？（）A、The MPLS header is 2 bytes，and the EXP field is 3 bits long.B、The MPLS header is 1 byte，and the EXP field is 3 bits long.C、The MPLS header is 4 bytes，and the EXP field is 3 bits long.D、The MPLS header is 3 bytes，and the EXP field is 3 bits long.
How many messages does Internet Key Exchange use to negotiate SA characteristics when it runs inaggressive mode？（）A、3B、4C、5D、2E、6
An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）A、EXP bitsB、VPI / VCIC、shim headerD、SNAP header
单选题Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）AThe TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSRBTTL propagation cannot be disabled in an MPLS domainCTTL propagation is only disabled on the ingress edge LSRDThe TTL field of the MPLS label header is set to 255EThe TTL field of the IP packet is set to 0
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.
单选题Where is the MPLS label imposed？（）Aafter the Layer 3 header and before the Layer 2 payloadBafter the Layer 3 header and before the Layer 4 payloadCafter the Layer 2 header and before the Layer 1 payloadDafter the Layer 1 header and before the Layer 2 payloadEafter the Layer 2 header and before the Layer 3 payload
单选题In the context of MPLS，what is the correct action to be performed when an aggregate label is received ？（）AIt adds the VPN label into the top label in the MPLS label stackBIt replaces the top label in the MPLS label stack with a VPN label and propagatesCIt replaces the bottom label in the MPLS label stack with a VPN label and propagatesDIt removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packetsENone of above
单选题A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?（）AIt performs a label pop operation and an IP lookup.BIt performs a label swap operation and an IP lookup.CIt sends an error message toward the egress router.DIt sends an error message toward the ingress router.
单选题Which of the following is true about the MPLS header and its EXP field size？（）AThe MPLS header is 2 bytes，and the EXP field is 3 bits long.BThe MPLS header is 1 byte，and the EXP field is 3 bits long.CThe MPLS header is 4 bytes，and the EXP field is 3 bits long.DThe MPLS header is 3 bytes，and the EXP field is 3 bits long.
单选题An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）AEXP bitsBVPI / VCICshim headerDSNAP header