H31-161 試験問題を無料オンラインアクセス

Which of the following statements about the L2VPN are true?

• A.On a L2VPN, routing information of users does not need to be maintained or managed.
• B.When providing the MPLS L2VPN service for enterprise users, the carrier must filter user route advertisements. Otherwise, flapping of user routes may lead to flapping of network routes.
• C.If the length of a L2VPN packet that arrives at a P node exceeds the maximum transmission unit (MTU) of relevant interfaces of the P node, the packet will be fragmented and then forwarded.
• D.When a traditional L2VPN (ATM and FR) is upgraded to an MPLS L2VPN, the network topology does not need to be adjusted.

RTA is a leaf router that directly connects to host A through interface GigabitEthernet 1/0/0. The interface is configured as follows:
interface GigabitEthernet1/0/0
undo shutdown
ip address 192.168.4.2 255.255.255.0
pim sm
igmp enable
igmp version 3igmp ssm-mapping enable
igmp static-group 232.1.1.1
Configurations in the IGMP view are as follows:
igmp
ssm-mapping 232.1.1.0 255.255.255.0 10.10.1.1
ssm-mapping 232.1.2.0 255.255.255.0 10.10.1.1
Host A sends an IGMPv2 Report message to group 232.1.2.2. Which entry can be displayed by the display igmp ssm-mapping group command?

• A.(10.10.1.1, 232.1.2.2)
• B.No entry
• C.(10.10.1.1, 232.1.1.1) and (10.10.1.1, 232.1.2.2)
• D.(10.10.1.1, 232.1.1.1)

On a metropolitan area network, VIP customers access the network through the MPLS VPN to ensure their security. Which of the following security deployments are required for PEs?

• A.Configure the CP-CAR on the interface connected to the CE.
• B.Configure the ACL to filter out IP packets that use the IP address of the CE-connected interface as the destination address.
• C.Deploy protocol authentication if a router protocol is used between PEs and CEs.
• D.Configure the ACL to filter out data packets with common network viruses at the interface connected to the CE.

As shown I the figure, the asymmetric VLL FRR networking is used AC interfaces on PE 1, PE 2 and PE 3 are configured as follows:

Which of the following statements are the true on the condition that IGP and MPLS are configured correctly on the public network?

• A.If a forwarding fault is detected on the PW between PE a and PE 2 , traffic can be switched to the backup PW on PE 1.
• B.If a forwarding fault is detected on the public network side of the between PE 1 and PE 2, traffic from CE 2 to CE 1 can be switched to the PW between PE 1 and PE3.
• C.The PW between PE1 and PE 2 is the primary PW.
• D.If a forwarding fault is detected on the PW between PE a and PE 2 , traffic from CE 1 to CE 2 can be switched to the PW between PE 1 and PE 3.

Which of the following statements about the destination addresses of packets and the Router Alert option are true?

• A.The ResvTear message without the Router Alert option is sent to the previous hop.
• B.The PathTear message without the Router Alert option is sent to the next hop.
• C.The Resv message carrying the Router Alert option is sent to the ingress node.
• D.The Path message carrying the Router Alert option is sent to the egress node.