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

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

Which of the following are rules for the router to check the RPF after receiving SA messages from the MSDP?

• A. Query the MBGP route and then the BGP route
• B. Check the RPF based on the next hop of the route that reaches the source RP.
• C. Query the BGP route and then the MBGP route
• D. Check the RPF based on the source RP contained in the received SA message.

Refer to the exhibit.

Eth0 and Eth1 on PE 3 are bound to VRF1 and VRF2, respectively. A valid static route 1.1.1.1/32 is imported to BGP domains from CE 1, CE 2, and CE 4, respectively. Which of the following statements are false?

• A. CE 3 cannot learn route 1.1.1.1/32 on CE 2 because the RD of this route is different from that of the VRF.
• B. CE 3 can learn route 1.1.1.1/32 on CE 4.
• C. CE 3 cannot learn route 1.1.1.1/32 on CE 1 because the RD of this route is the same as that of the VRF.
• D. Local VRFs must use different RDs

Which of the following statements about the Martini VPLS are true?

• A. Labels are allocated for PWs in DoD mode when they are established.
• B. Labels are retained using the liberal label retention method.
• C. A VC must be established using remote LDP.
• D. Labels are allocated for PWs in DU mode when they are established.
• E. When LDP is used to transmit signaling, LDP TLVs carry the VPLS information.

As shown in the figure, IGP is configured on RT 1 and RT 2, and route 193.3.6.0/24 is configured on RT 2. Which of the following statements is correct? Suppose OSPF is used here. Configure an access control list (ACL) on RT 2 in system mode.
ACL 2000
rule 5 permit source 193.3.6.0 0.0.0.255
Configure a routing policy in system mode:
route-policy t permit node 1
if-match acl 2000
apply backup-nexthop 106.108.4.1
apply backup-interface Ethernet4/0/4
Configure the IP FRR in system mode:
ip frr route-policy tConfigure the ethe4/0/4 interface of RT 2:
ospf cost 100
Configure BFD on RT 2:
Enable BFD on Ethernet4/0/3
bfd b1 bind peer-ip 106.108.3.1 interface Ethernet4/0/3
discriminator local 1
discriminator remote 1
min-tx-interval 10
min-rx-interval 10
process-pst
commit

Configuration on RT 1:
Enable BFD on Ethernet7/0/3
bfd b1 bind peer-ip 106.108.3.2 interface Ethernet7/0/3
discriminator local 1
discriminator remote 1
min-tx-interval 10
min-rx-interval 10
process-pst
commit

• A. The IP FRR function is enabled for the traffic bound for 193.3.6.0/24 on RT 2. It is unnecessary to configure the ethe4/0/4 interface on RT 2.
• B. Except the entry nexthop:106.108.3.1, a backup forwarding entry nexthop:106.108.3.1 is also generated for the traffic bound for 193.3.6.0/24 in the FIB table.
• C. Use a tester to send traffic from FE5 to FE6 after the BFD session becomes Up, run the undo ip address command in the ethe7/0/3 interface view on RT 1, and calculate the time for switchover based on the number of lost packets and packet receiving rate measured by the tester. The switchover takes less than 50 ms.
• D. If apply backup-interface Ethernet4/0/4 is deleted, the backup forwarding entry can also be generated because apply backup-nexthop 106.108.4.1 takes effect.