Which of the following is used as the destination port for single-hop BFD?

• A.UDP port 3784
• B.UDP port 4784
• C.TCP port 3784
• D.TCP port 4784

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IGMP3 not only supports the general group query of IGMPv1 version and the specific group query of IGMPv2 version, but also supports the specified source/group query of IGMPv3 version.

• A.TRUE
• B.FALSE

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GRE is a VPN encapsulation technology that is widely used to transmit packets across heterogeneous networks. Which of the following statements is false about GRE?

• A.GRE supports encryption and authentication.
• B.GRE supports multicast transmission.
• C.GRE is a Layer 3 VPN encapsulation technology.
• D.GRE can work with other VPN protocols to better ensure data security.

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In dual-link hot backup, the AP will establish CAPWAP links with the main AC and backup AC.

• A.FALSE
• B.TRUE

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PBR is a mechanism for selecting routes based on user-defined policies. There are two types of PBR:
interface-based PBR and local PBR. Which of the following statements is false about these two types of PBR?

• A.Interface-based PBR takes effect only for forwarded packets.
• B.Local PBR takes effect only for locally originated packets.
• C.Interface-based PBR is configured on an interface and takes effect only for incoming packets on the interface.
• D.Local PBR is configured in the protocol view.

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