Which of the following statements about the BFD single-arm echo function are correct? (Multiple Choice)

• A.BFD single-arm echo function is applicable to scenarios where one device supports BFD and the other device does not.
• B.The BFD single-arm echo function must be configured with a local identifier and a remote identifier.
• C.After the BFD single-arm echo function is enabled, the destination IP and source IP of the BFD packets are the same.
• D.The default destination IP address of the BFD single-arm echo function protocol packet is 224.0.0.184.

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The interface Serial0 of an existing router is in OSPF area 1, and the interface Serial0 is set to the Silent interface, so what effect does this setting have?

• A.OSPF will receive routing updates from neighbors
• B.OSPF does not add routes learned from the interface to the local routing table.
• C.OSPF does not establish any adjacencies through the interface.
• D.OSPF establishes available adjacencies through this interface.

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Which of the following statements about URPF, IPSG and DAI are wrong? (Multiple Choice)

• A.IPSG checks the source IP address and MAC address of the IP message. DAI only checks the correspondence between IP and MAC.
• B.URPF can be used to prevent DDoS false source attacks.
• C.DAI does not support manual configuration of the binding table.
• D.IPSG technology checks IP packets to prevent source IP spoofing attacks, while DAI checks ARP packets to filter the attack source

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Which of the following statements about static VXLAN channel configuration are correct? (Multiple choice)

• A.A BD needs to create an NVE interface, when there are multiple BDs, multiple NVE interfaces must be created
• B.One NVE interface can be associated with multiple VNIs, so when there are multiple BDs, only one NVE interface can be created
• C.In the NVE interface, the destination address of the VXLAN tunnel can be specified by the address in the head-end copy list. Multiple VXLAN tunnels can only create one NVE interface
• D.For a VXLAN tunnel, a one-to-one corresponding NVE interface needs to be created, in which the source IP address and destination IP address are clearly specified. Therefore, there are multiple VXLAN tunnels on VTEP. The corresponding number of NVE interfaces must be configured

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In the intranet MPLS BGP VPNF network, when a packet enters the public network for forwarding, it will be encapsulated with two layers of MPLS labels. The following description of the two-layer label, which is wrong?

• A.The egress PE uses the inner label when determining which egress CE the message should be sent to.
• B.The private network label is carried and distributed when the route is delivered by MP-BGP. The public network label is distributed by the LDP protocol.
• C.MPLS BGP VPN uses two layers of labels: public network labels (also known as outer labels) and private network labels (also known as inner labels).
• D.By default, the router assigns the same label value to all VPNv4 routes destined for the peer PE.

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