On the IP bearer network, different VPN users (VPN A and VPN B) must access the internet through the same
egress. Which of the following schemes can achieve security isolation VPNs and have the best scalability?

• A.Option A
• B.Option C
• C.Option D
• D.Option B

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

• A.After LDP FRR is enabled, a backup LSP can be generated for a primary LSP to prevent serious packet loss during fast flapping of the primary LSP
• B.Multiple LSPs can be backed up on the ingress node, that is, entries about multiple backup LSPs are generated in the forwarding table according to the priority of the LDR FRR, implementing multilayer protection.
• C.After LDP FRR is enabled, a backup LSP is generated. Both the primary and backup LSPs are stored in the forwarding table.
• D.LDP FRR can be deployed on the ingress node and the intermediate node.The primary and backup LSPs are recorded in the ILM table on the intermediate node and in the FIB table on the ingress node.

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On a router, HQoS parameter are configured for the users. The CURP of user 1 is Mbit/s. The CUR and PIR
ofuser 2 are 0 Mbit/s and 10 Mbit/s, respectively. The CIR and PR of user 3 are 0 Mbit and 20 Mbit/s
respectively. These three users join group with a bandwidth of 10 Mbit/s.
Which statements is true?

• A.User 2 is of higher priority than user 1
• B.User 3 is of higher priority than user 2
• C.User 1 is of the highest priority among these users
• D.No user can preempt the bandwidth of the other two users

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On the BGP network, which of the following policies can be used to prevent BGP-targeted attacks?

• A.At the inbound interface of a router, filter the TCP packets of a non-service router. The ID of the destination interface is 179 at the loopback IP address of the non-service router
• B.Only packets carrying the loopback IP addresses of service routers can pass through the interface, and all other packets are discarded.
• C.Enable the BGP authentication function between BGP peers.
• D.At the outbound interface of a router, filter the TCP packets of a non-service router. The ID of the destination interface is 179 at the loopback IP address of the non-service router.

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An interface sends 300 Mbit/s user BE traffic. The downstream HQoS scheduling is configured at this
interface as follows
SQ: cir 15 Mbit/s pw 200 Mbit/s
FQ. queue be Ipq shaping 10
CQ: port-queue be Ipq shaping shaping-percentage 10 outbound, port shaping 100
How much traffic is at the downstream outbound interface after HQoS scheduling?

• A.100 Mbit/s
• B.10 Mbit/s
• C.200 Mbit/s
• D.20 Mbit/s

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