The following statements about the VRRP protocol which are correct?

• A.The owner of the Mater IP address has VRRP priority of 255, so the priority range that can be configured is 0-254.
• B.VRRPv2 is only applicable to IPv4 networks, and VRRPv3 is only applicable to IPv6 networks.
• C.Both VRRPv2 and VRRPv3 support authentication.
• D.VRRPv3 does not support authentication, while VRRPv2 supports authentication.

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For Layer 2 VPN technology, which of the following statements are correct? (Multiple Choice)

• A.The VPLS configuration is highly complex. The Layer 2 network transparently transmits BUM packets.
• B.VPLS is a widely used technology on the live network. It can provide Layer 3 packet transparent transmission and achieve multi-point access.
• C.BGP EVPN solves the problem of MAC address drift and multi-tenancy that VPLS cannot support.
• D.BGP EVPN supports tenant isolation, multi-homing and broadcast suppression

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Which scenario can use AS-path -filter?

• A.apply clause in Route-policy
• B.If-match clause in Route-policy
• C.Filter the route received to the BGP neighbor according to the AS_PATH attribute carried in the route. For example, the command peer x.x.x.x as-path-filter import
• D.Filter the route sent to the BGP neighbor according to the AS_PATH attribute carried in the route. For example, the command peer x.x.x.x as-path-filter export

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When judging the old and new LSA, the serial number parameter and the age parameter will be used. Which of the following statements about the two parameters is correct?

• A.If the serial number of the LSA reaches the end value of 0x7FFF, the current router advertises the age is lsa of 3600s.
• B.When the router receives an LSA age is 360s, the LSA is unavailable.
• C.When the router receives two LSAs, the serial number is the same, the checksum is the same, and the smaller the age, the better.
• D.Both the serial number and the age parameter can judge the LSA is old or new, and the router preferentially compares the sequence parameters, the larger the better.

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As shown in the figure, the IPSEC VPN is established between the branch and the headquarters using redundant links. At the same time, URPF is enabled for the traffic from the branch 1 on Router_B. Which of the following options is correct? (Multiple Choice)

• A.When using IPSEC multi-link redundancy backup, URPF strict mode can be used when enable URPF function on the tunnel interface.
• B.When using IPSEC main-link redundant backup, URPF strict mode can be used when the URPF function is used on the physical interface.
• C.When using IPSEC multi-link redundancy backup, RPF strict mode can be used when enable URPF function on the physical interface.
• D.When using IPSEC main-link redundant backup, URPF loose mode is recommended when the URPF function is used on the physical interface.

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