Which of the following operations will make a PE send notifications to its peer in PWE3?

• A.Shut down an AC interface
• B.Disable MPLS
• C.Shut down a public network tunnel
• D.Delete the L2VPN services from an interface

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Which statement about MPLS Echo packets is true?

• A.The MPLS Echo request is a UDP packet.
• B.The MPLS Echo request is an ICMP packet.
• C.The type value of the MPLS Echo request packet is 0.
• D.The type value of the MPLS Echo reply packet is 8

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Which message does the pseudo wire emulation edge-to-edge (PWE3) add for LDP signaling extension compared with Martini VLL?

• A.Mapping
• B.Withdraw
• C.Notification
• D.Release
• E.Request

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Refer to the exhibit.

As shown in the figure, CE 1 and CE 3 belong to VPN A, CE 2 and CE 4
belong to VPN B, and users on different VPNs are not allowed to access each other. Which of the following configurations can enable mutual access between CE 1 and CE 4 but forbid cross-VPN access between other CEs?
Configuration of PE 1:
sysname PE 1
#
ip vpn-instance vpna
route-distinguisher 100:1vpn-target 1:1 3:3 export-extcommunity
vpn-target 1:1 3:3 import-extcommunity
# i
p vpn-instance vpnb
route-distinguisher 100:2
vpn-target 2:2 4:4 export-extcommunity
vpn-target 2:2 4:4 import-extcommunity
#
Configuration of PE 2:
#
sysname PE 2
#
ip vpn-instance vpna
route-distinguisher 200:1
vpn-target 1:1 export-extcommunity
vpn-target 1:1 import-extcommunity
#
ip vpn-instance vpnb
route-distinguisher 200:2
vpn-target 2:2 4:4 export-extcommunity
vpn-target 2:2 4:4 import-extcommunity

• A.Run vpn-target 1:1 on VPN b of PE 2
  The configuration is as follows:
  [PE 2]ip vpn vpnb
  [PE 2-vpn-instance-vpnb]vpn-target 1:1 export-extcommunity
  [PE 2-vpn-instance-vpnb]vpn-target 1:1 import-extcommunity
• B.Run vpn-target 3:3 on VPN b of PE 2
  The configuration is as follows:
  [PE 2]ip vpn vpnb
  [PE 2-vpn-instance-vpnb]vpn-target 3:3 export-extcommunity
  [PE 2-vpn-instance-vpnb]vpn-target 3:3 import-extcommunity
  "
• C.Run vpn-target 2:2 on VPN a of PE 1The configuration is as follows:
  [PE 1]ip vpn vpna
  [PE 1-vpn-instance-vpna]vpn-target 2:2 export-extcommunity
  [PE 1-vpn-instance-vpna]vpn-target 2:2 import-extcommunity
• D.Run vpn-target 4:4 on VPN a of PE 1
  The configuration is as follows:
  [PE 1]ip vpn vpna
  [PE 1-vpn-instance-vpna]vpn-target 4:4 export-extcommunity
  [PE 1-vpn-instance-vpna]vpn-target 4:4 import-extcommunity

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The edge routers of the MPLS network, partial interface configurations on the IP access side are as follows:
[Quidway]diffserv domain default
[Quidway-dsdomain-default]ip-dscp-inbound 10 phb ef green
[Quidway-dsdomain-default]mpls-exp-outbound ef green map 5
[Quidway-dsdomain-default]mpls-exp-inbound 4 phb ef green
[Quidway-dsdomain-default]ip-dscp-outbound ef green map 18
[Quidway-dsdomain-default]quit[Quidway] interface GigabitEthernet 2/0/0
[Quidway-GigabitEthernet2/0/0] trust upstream default
[Quidway-GigabitEthernet2/0/0] port-queue ef pq shaping 20 outbound
Which of the following statements about the preceding configurations are true?

• A.The port-queue ef pq shaping 20 outbound command configures PQ scheduling and a maximum of 20 Mbit/s bandwidth for the EF queue when GigabitEthernet 2/0/0 sends IP packets.
• B.If an IP packet with a DSCP value of 10 is sent to the MPLS network (non-PHP node) from GigabitEthernet 2/0/0, the corresponding EXP value is 5. If an MPLS packet with an EXP value of 4 is sent from GigabitEthernet 2/0/0, the DSCP value of the corresponding IP packet remains unchanged.
• C.The trust upstream default command maps the DSCP priority to the corresponding EXP value when an IP packet enters the MPLS network and maps the EXP value to the corresponding DSCP priority when an IP packet leaves the MPLS network.
• D.When GigabitEthernet 2/0/0 sends IP packets, the bandwidth of these sent IP packets can reach 1 Gbit/s if the EXP value is 4.

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