Exhibit.

As shown in the figure, virtual private LAN service (VPLS) is enabled on routers PE 1 and PE 2.CEs are
connected to PEs through QinQ and PC A and PC B are connected to the two CEs. The two PCs belong to the
same VPN and can communicate with each other properly. Which of the following statements about the
communication process when you ping PC B from PC A are true?

• A.PE 1 receives packets with a VLAN tag from CE 1 and adds a VLAN tag to these packets.
• B.PE 1 add two MPLS labels to a packet before sending the packet to a router.
• C.If the penultimate hop popping (PHP) feature of MPLS is enabled on PEs, a packet received by PE 2
  from a P router has two VLAN tags one MPLS label.
• D.A packet received by CE 2 from PE 2 has two VLAN tags CE 2 removed theouter tab and forwards the
  packets to PC B based on the innertag

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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.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.
• C.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.
• 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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On the OSPF network, which of the following statements about the authentication function of the OSPF
protocol are true?

• A.The authentication function of the OSPF is implemented by parameter settings in hello packets.
• B.The OSPF protocol supports area authentication and interface authentication.
• C.The interface authentication mode can be different from the area authentication mode.
• D.The interface authentication mode must be consistent with the area authentication mode . For Example,
  interface and area are authentication in simple or MDS mode or are not authenticated.

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As shown in the figure, the DiffServ model is deployed in E-LSP mode on the MPLS network. A tester connects to GE interfaces of RTA and RTC on the edge of the MPLS network through GE links. The trust upstream default command is configured for interfaces on the IP access side of RTA and RTC. When the tester sends IP packets with DSCP values 10, 12, and 14,the DSCP values of IP packets received at the receiver side are supposed to remain unchanged. However, the DSCP values of all received IP packets are 10. In this case, which of the following statements are true? (Default mapping is configured between the EXP and DSCP values on each router.)

• A.If the qos phb disable command is configured for the outbound interface on the IP access side of RTC, the DSCP values of packets the tester receives remain unchanged.
• B.The configurations on RTA or RTC are incorrect.
• C.The DSCP values are 10 when RTA's IP packets leave the MPLS network because the EXP values are 1 when RTA's IP packets enter the MPLS network.
• D.The DSCP values of packets the tester receives are 10 regardless of whether qos phb disable is configured for the outbound interface on RTC's IP access side.

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Which of the following statements about the working principle f LDAP FRR are true?

• A.After LDP FRR enable, a backup can degenerated for a primary LSP to prevent serious packet loss
  during fats flapping of the primary LSP.
• B.After LDP FRR is enabled, a backup LSP is generated both the primary and backup LSPs are stored in
  the forwarding table.
• C.LDP TFRR can be deployed on the ingress node and the intermediate node. The primary and backup
  LSPas are recorded in the ILM table on the intermediate node and on the FIB table on the ingress node.
• D.Multiple LSPs can be up on the ingress node, that is entries about multiple backup LSPs are generated in
  the forwarding table according to the priority of the FRR, implementing multi-layer protection.

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